Find full lists of Ideal boiler error and fault codes alongside possible causes and solutions. Keep your Ideal boiler running smoothly with help from BOXT.

<p>Noticing that there&rsquo;s a fault with your Ideal <a href="https://www.boxt.co.uk/boilers" rel="follow">boiler</a> is less than ideal, but getting it sorted doesn&rsquo;t have to be as much of a hassle as you&rsquo;d expect.</p>
<p>It&rsquo;s important to note that once you&rsquo;ve discovered an issue with your system, a Gas Safe registered engineer needs to be called to diagnose and rectify the problem fully.</p>
<p>To make the process of diagnosing any problems as painless as possible, Ideal pre-programs its boilers with fault and error codes. These codes are displayed on the user interface to alert you and your engineer to anything that needs attention within the system.</p>
<p>Here, we&rsquo;ll cover all of the most common Ideal boiler fault codes, discussing their meaning and advising on any next steps that you or a Gas Safe registered engineer can take to get things back to working as they should.</p>
<h2>Ideal boiler fault &amp; error codes by boiler model</h2>
<ul>
<li><a href="#h_283069789193621705408930675" rel="follow">Ideal boiler F fault codes</a></li>
<li><a href="#h_373458347195981705408940506" rel="follow">Ideal boiler L fault codes</a></li>
<li><a href="#h_651947860197021705408948577" rel="follow">Ideal boiler C fault codes</a></li>
<li><a href="#h_541516278198321705408957447" rel="follow">Additional Ideal boiler fault codes</a></li>
</ul>
<h2 id="h_283069789193621705408930675">Ideal boiler F fault codes</h2>
<table border="1" style="border-collapse: collapse; width: 100.054%; height: 293.907px;"><colgroup><col style="width: 16.4882%;"><col style="width: 40.1695%;"><col style="width: 43.3423%;"></colgroup>
<tbody>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;"><strong>Error code</strong></td>
<td style="height: 19.5938px;"><strong>Problem</strong></td>
<td style="height: 19.5938px;"><strong>Solution</strong></td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">F</td>
<td style="height: 19.5938px;">Boiler operating in frost mode.</td>
<td style="height: 19.5938px;"><a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">Contact an engineer.</a></td>
</tr>
<tr style="height: 39.1875px;">
<td style="height: 39.1875px;">FD</td>
<td style="height: 39.1875px;">No water flow</td>
<td style="height: 39.1875px;">Repressurise the boiler. If this doesn&rsquo;t resolve the issue, <a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">call an engineer</a>.</td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">FU</td>
<td style="height: 19.5938px;">Flow/return differential &ndash; 50&deg;C</td>
<td style="height: 19.5938px;"><a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">Contact an engineer.</a></td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">F1</td>
<td style="height: 19.5938px;">Low boiler pressure</td>
<td style="height: 19.5938px;">Top up the <a href="https://www.boxt.co.uk/boilers/guides/boiler-pressure" rel="follow">water pressure</a>.</td>
</tr>
<tr style="height: 39.1875px;">
<td style="height: 39.1875px;">F2/FL</td>
<td style="height: 39.1875px;">Flame loss</td>
<td style="height: 39.1875px;">Reset the boiler. If this doesn&rsquo;t resolve the issue, <a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">call a Gas Safe engineer</a>.</td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">F3</td>
<td style="height: 19.5938px;">Fan fault</td>
<td style="height: 19.5938px;"><a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">Contact an engineer.</a></td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">F4</td>
<td style="height: 19.5938px;">Thermistor fault</td>
<td style="height: 19.5938px;"><a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">Contact an engineer.</a></td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">F5</td>
<td style="height: 19.5938px;">Return thermistor fault</td>
<td style="height: 19.5938px;"><a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">Contact an engineer.</a></td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">F6</td>
<td style="height: 19.5938px;">Outside sensor fault</td>
<td style="height: 19.5938px;"><a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">Contact an engineer.</a></td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">F7</td>
<td style="height: 19.5938px;">Low mains voltage</td>
<td style="height: 19.5938px;"><a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">Contact an engineer.</a></td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">F8</td>
<td style="height: 19.5938px;">Printed circuit board (PCB) fault</td>
<td style="height: 19.5938px;"><a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">Contact an engineer.</a></td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">F9</td>
<td style="height: 19.5938px;">Unconfigured PCB.</td>
<td style="height: 19.5938px;"><a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">Contact an engineer.</a></td>
</tr>
</tbody>
</table>
<h2 id="h_373458347195981705408940506">Ideal boiler L fault codes</h2>
<table border="1" style="border-collapse: collapse; width: 100.054%; height: 431.063px;"><colgroup><col style="width: 16.8094%;"><col style="width: 40.0532%;"><col style="width: 43.0303%;"></colgroup>
<tbody>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;"><strong>Error code</strong></td>
<td style="height: 19.5938px;"><strong>Problem</strong></td>
<td style="height: 19.5938px;"><strong>Solution</strong></td>
</tr>
<tr style="height: 39.1875px;">
<td style="height: 39.1875px;">L1</td>
<td style="height: 39.1875px;">Low water flow</td>
<td style="height: 39.1875px;">Reset the boiler. If this doesn&rsquo;t resolve the issue, <a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">call an engineer</a>.</td>
</tr>
<tr style="height: 39.1875px;">
<td style="height: 39.1875px;">L2</td>
<td style="height: 39.1875px;">Ignition lockout</td>
<td style="height: 39.1875px;">Reset the boiler. If you hear a <a href="https://www.boxt.co.uk/boilers/guides/9-reasons-why-your-boiler-is-making-a-noise" rel="follow">rumbling noise</a>, <a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">call an engineer</a>.</td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">L3</td>
<td style="height: 19.5938px;">No flow thermistor fault</td>
<td style="height: 19.5938px;"><a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">Contact an engineer.</a></td>
</tr>
<tr style="height: 39.1875px;">
<td style="height: 39.1875px;">L9/H9/HA/LA</td>
<td style="height: 39.1875px;">Overheating</td>
<td style="height: 39.1875px;">Check pressure readings and <a href="https://www.boxt.co.uk/boilers/guides/how-to-bleed-a-radiator" rel="follow">bleed your radiators</a>. If no change, <a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">call an engineer</a>.</td>
</tr>
<tr style="height: 39.1875px;">
<td style="height: 39.1875px;">LF</td>
<td style="height: 39.1875px;">Ignition fault</td>
<td style="height: 39.1875px;">Reset your boiler. If your boiler is rumbling, <a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">contact a qualified engineer</a>.</td>
</tr>
<tr style="height: 39.1875px;">
<td style="height: 39.1875px;">L4</td>
<td style="height: 39.1875px;">Flow thermistor fault</td>
<td style="height: 39.1875px;">Restart the boiler. If the issue continues, <a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">contact an engineer</a>.</td>
</tr>
<tr style="height: 39.1875px;">
<td style="height: 39.1875px;">L5</td>
<td style="height: 39.1875px;">Boiler return pipe issue</td>
<td style="height: 39.1875px;">Turn off the boiler&rsquo;s power at the fuse spur, then turn it back on. If the issue persists, <a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">call an engineer</a>.</td>
</tr>
<tr style="height: 39.1875px;">
<td style="height: 39.1875px;">L6</td>
<td style="height: 39.1875px;">Flame detection fault</td>
<td style="height: 39.1875px;">Reset your boiler. If the problem persists, <a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">contact an engineer</a>.</td>
</tr>
<tr style="height: 58.7812px;">
<td style="height: 58.7812px;">LC</td>
<td style="height: 58.7812px;">5 boiler resets in 15 minutes.</td>
<td style="height: 58.7812px;">Turn the electrical supply to the boiler off and on. If the boiler fails to operate, <a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">contact a Gas Safe registered engineer</a>.</td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">L9</td>
<td style="height: 19.5938px;">Unconfigured PCB</td>
<td style="height: 19.5938px;"><a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">Contact an engineer.</a></td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">L-F</td>
<td style="height: 19.5938px;">Boiler fails to ignite</td>
<td style="height: 19.5938px;">Try resetting the boiler. If nothing changes, <a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">contact an engineer</a>.</td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">L-A</td>
<td style="height: 19.5938px;">Boiler overheated</td>
<td style="height: 19.5938px;">Check that there is <a href="https://www.boxt.co.uk/boilers/guides/boiler-pressure" rel="follow">sufficient water pressure</a> in the central heating system and that all radiators have been bled. Then, reset the boiler. If the issue persists, <a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">contact an engineer</a>.</td>
</tr>
</tbody>
</table>
<h2 id="h_651947860197021705408948577">Ideal boiler C fault codes</h2>
<table border="1" style="border-collapse: collapse; width: 100.054%; height: 117.563px;"><colgroup><col style="width: 17.1306%;"><col style="width: 40.1599%;"><col style="width: 42.6025%;"></colgroup>
<tbody>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;"><strong>Error code</strong></td>
<td style="height: 19.5938px;"><strong>Problem</strong></td>
<td style="height: 19.5938px;"><strong>Solution</strong></td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">C2</td>
<td style="height: 19.5938px;">Boiler chip card fault.</td>
<td style="height: 19.5938px;">Reset your boiler. If the issue persists, <a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">contact an engineer</a>.</td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">C0</td>
<td style="height: 19.5938px;">Central heating signal issue.</td>
<td style="height: 19.5938px;"><a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">Contact an engineer.</a></td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">C</td>
<td style="height: 19.5938px;">The boiler is operating in central heating mode. Or the boiler has a call for central heating, and the appliance has reached the desired set temperature.</td>
<td style="height: 19.5938px;">No solution needed. This is a setting, not a problem.</td>
</tr>
</tbody>
</table>
<h2 id="h_541516278198321705408957447">Additional Ideal boiler fault codes</h2>
<table border="1" style="border-collapse: collapse; width: 100.054%; height: 156.75px;"><colgroup><col style="width: 17.0236%;"><col style="width: 40.3739%;"><col style="width: 42.4955%;"></colgroup>
<tbody>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;"><strong>Error code</strong></td>
<td style="height: 19.5938px;"><strong>Problem</strong></td>
<td style="height: 19.5938px;"><strong>Solution</strong></td>
</tr>
<tr style="height: 58.7812px;">
<td style="height: 58.7812px;">D</td>
<td style="height: 58.7812px;">The boiler is operating in hot water mode, or the boiler has a call for hot water and the appliance has reached the desired set temperature.</td>
<td style="height: 58.7812px;">No solution needed; this is a setting.</td>
</tr>
<tr style="height: 39.1875px;">
<td style="height: 39.1875px;">0</td>
<td style="height: 39.1875px;">The boiler is in standby mode awaiting hot water requests or a central heating call.</td>
<td style="height: 39.1875px;">Choose your settings.</td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">H-3</td>
<td style="height: 19.5938px;">Domestic hot water thermistor error.</td>
<td style="height: 19.5938px;">Reset the system.</td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">No display</td>
<td style="height: 19.5938px;">No heating or hot water.</td>
<td style="height: 19.5938px;">This is a PCB error. <a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">Call an engineer</a>.</td>
</tr>
</tbody>
</table>
<h2>Protect your home&rsquo;s central heating with BOXT</h2>
<p>Luckily, the majority of Ideal <a href="https://www.boxt.co.uk/boilers" rel="follow">boiler</a> problems are relatively quick and easy for qualified engineers to fix, provided they&rsquo;re identified promptly. If you suspect that any of the issues mentioned above are to blame for your boiler&rsquo;s malfunctioning, and the recommended fix isn&rsquo;t as simple as pressing the reset button, always contact a Gas Safe registered engineer who&rsquo;ll be able to come and assist you.</p>
<p>Sometimes, it&rsquo;s better to be safe than sorry. We all know that household issues arise when you&rsquo;re least prepared for them, so it helps to have a good idea of how your boiler is performing.&nbsp;</p>
<p>If you&rsquo;re unsure about the current performance of your boiler, why not book a <a href="https://www.boxt.co.uk/boilers/boiler-servicing" rel="follow">boiler service</a>? With the help of our engineers, you&rsquo;ll be sound in the knowledge that your boiler is doing the most it can possibly do for your home.</p>

Ideal boiler fault & error codes

Find full lists of Baxi boiler error and fault codes with possible causes and fixes. Resolve issues with combi, system and standard boilers.

Get in touch with our Gas Safe registered engineers today

Baxi Boiler fault & error codes

Find full lists of Vaillant boiler error and fault codes with possible causes and fixes. Resolve issues with combi, system and standard boilers.

Vaillant boiler fault & error codes

BOXT engineer arriving at the front door with his tool box

Facing Navien boiler problems? Explore these common issues, their causes, and what to do when you encounter them.

<p>Even though it&rsquo;s a relative newcomer to the UK <a href="https://www.boxt.co.uk/boilers" rel="follow">boiler</a> market, <a href="https://www.boxt.co.uk/boilers/navien-boilers" rel="follow">Navien</a> is one of the most trusted manufacturers there is. Across the Far East, consumers see Navien as the go-to brand for domestic home heating solutions, celebrating their industry-leading technologies, incredible energy efficiency and user-friendly features.</p>
<p>But no technology is perfect, and even the most reliable models can encounter issues from time to time. If you happen to experience a problem with your Navien boiler, getting it fixed promptly will be a top priority for everyone living in your property. Luckily, most issues can be rectified by a qualified professional pretty easily.</p>
<p>In this guide, we&rsquo;ll walk you through some of the common problems you may encounter with a Navien boiler. We&rsquo;ve split this into issues that you should be able to remedy yourself and urgent problems that should only be attempted by a Gas Safe registered engineer (such as the team at BOXT).&nbsp;</p>
<h2>Common Navien boiler problems and fixes</h2>
<p>When there's a problem with your boiler, you'll usually notice an error code or an issue with your pressure gauge being too high or too low.&nbsp;<br>Here are some of the most common Navien boiler problems and the steps you can take to fix them.</p>
<p><strong>Please note: </strong>While these fixes can be performed yourself; if you don&rsquo;t feel confident, don&rsquo;t hesitate to enlist the help of a professional.&nbsp;</p>
<h3>Ignition failure</h3>
<p>One of the most common error codes for Navien boilers is E003, which indicates there's an ignition fault.</p>
<p>If you encounter this error code, try restarting your boiler and checking the gas supply. If you've already tried those things and your boiler still fails to ignite, you should contact a Gas Safe registered engineer to determine the exact problem.</p>
<p>They'll likely need to access and inspect the boiler's controls to find the cause, whether it's debris or faulty parts.</p>
<h3>Low pressure</h3>
<p>If your pressure gauge is showing <a href="https://www.boxt.co.uk/boilers/guides/why-does-my-boiler-pressure-keep-dropping" rel="follow">little to no pressure in your boiler</a>, it likely means the water pressure in your boiler is too low for the system to work efficiently. You might also see the error code E302.</p>
<p>Low pressure can be down to numerous things, including a potential fault with the pressure relief valve or a leak within the boiler or on the system pipework.</p>
<p>If you aren't confident in attempting to raise your boiler's pressure yourself, please contact one of our expert Gas Safe registered engineers to help you.</p>
<h3>High pressure</h3>
<p>If your <a href="https://www.boxt.co.uk/boilers/guides/is-your-boiler-pressure-too-high-heres-what-to-do" rel="follow">boiler's pressure gauge is too high</a>, contact a Gas Safe registered engineer who will be able to give you expert advice.<br>For more information, see our <a href="https://www.boxt.co.uk/boilers/guides/boiler-pressure" rel="follow">complete guide to boiler pressure</a>.</p>
<p><img src="https://cdn.buttercms.com/kLpNELX3Qfy2A79LZQWJ" alt="BoilerInstall-carousel08.webp"></p>
<h2>Urgent Navien boiler problems and fixes</h2>
<p>Below are some of the most common urgent boiler problems and their potential causes. If you encounter one of these issues with your boiler, it is essential to seek an emergency boiler call out from a Gas Safe registered engineer.&nbsp;</p>
<p><strong>Important: </strong>Do <strong>NOT</strong> attempt these fixes yourself.&nbsp;</p>
<h3>Overheating heat exchanger</h3>
<p>An overheating heat exchanger (error code E016 or E046) occurs when the component responsible for transferring heat from the burner to the water becomes excessively hot.</p>
<p>This can be caused by issues such as a lack of water flow or blocked pipes. An overheating heat exchanger can lead to serious safety hazards, including potential damage to the boiler and a risk of carbon monoxide leakage, which is also <a href="https://www.boxt.co.uk/boilers/guides/carbon-monoxide-testing" rel="follow">why it&rsquo;s important to have a working carbon monoxide alarm</a>.</p>
<p>If you suspect this problem, it is crucial to <a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">contact a Gas Safe registered engineer</a> to diagnose and address the issue, ensuring both your safety and the efficiency of your boiler.</p>
<h3>Flue issue</h3>
<p>The <a href="https://www.boxt.co.uk/boilers/guides/what-is-a-boiler-flue" rel="follow">boiler flue</a> is a component that connects to your Navien boiler and safely transports the combustion gases to outside&nbsp;<br>Factors like corrosion or obstructions in the flue/exhaust pipe can cause issues, potentially leading to harmful carbon monoxide leaks within your home.</p>
<p>If you encounter any flue related problems or suspect a malfunction, or blocked condensate, it's critical to <a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">contact a Gas Safe registered engineer</a> without delay.</p>
<h3>Temperature sensor issue</h3>
<p>The temperature sensors (thermistors) in your Navien boiler are responsible for monitoring and regulating the water's temperature within the appliance.</p>
<p>Issues can include general wear and tear, electrical problems, or sensor misplacement, causing the sensor to give inaccurate readings.</p>
<p>You shouldn't try to fix any underlying issue yourself. <a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">Call a Gas Safe registered engineer</a>, who will replace the sensor or find the cause of the inaccurate readings for you.</p>

<h2>Choose BOXT Home Cover</h2>
<p>We know how stressful it can be when your boiler stops working. That's why, at BOXT, we offer <a href="https://www.boxt.co.uk/home-cover" rel="follow">home cover plans</a> with no call-out or excess charges as standard.</p>
<p>Our Gas Safe registered engineers are experienced in installing and maintaining <a href="https://www.boxt.co.uk/boilers/navien-boilers" rel="follow">Navien boilers</a> too, so you, and your heating, will be in safe hands.</p>
<p>For more boiler advice, whether that&rsquo;s information on <a href="https://www.boxt.co.uk/boilers/guides/what-happens-when-a-new-boiler-is-fitted" rel="follow">what happens when a new boiler is fitted</a>, <a href="https://www.boxt.co.uk/boilers/guides/clearing-an-airlock-from-your-central-heating-system" rel="follow">how to clear an airlock</a>, and <a href="https://www.boxt.co.uk/boilers/guides/full-boiler-protection-plans" rel="follow">everything you need to know about full boiler protection plans</a>, check out our <a href="https://www.boxt.co.uk/guides?category=boilers" rel="follow">dedicated boiler guides</a>.</p>
<p>If you're just after some guidance, you can message us on our&nbsp;<a href="https://www.boxt.co.uk/" rel="follow">Live Chat</a> where you get the best advice from our heating specialists.</p>

How to troubleshoot Navien boiler problems

Explore when and how to reset different models of Navien boiler, including the NCB300 and LCB700, and when you should call a Gas Safe registered technician.

<p>Whether you've had your <a href="https://www.boxt.co.uk/boilers/navien-boilers" rel="follow">Navien boiler</a> for a few years or weeks, you will likely need to reset it at some point in its lifespan.</p>
<p>To ensure the efficiency and proper maintenance of your Navien boiler, you must understand what to do when an error message appears and when to press the reset button.</p>
<p>This guide explains everything you need to know about resetting your Navien <a href="https://www.boxt.co.uk/boilers" rel="follow">boiler</a> and ensuring you always have heating and hot water.</p>
<h2>Where is the reset button on a Navien boiler?</h2>
<p>Typically, the reset button on a Navien boiler will be on its front panel, near the control display.&nbsp;</p>
<p>The reset button's precise position on your boiler unit will vary based on the Navien model you own, so it's a good idea to check the instruction manual for the exact location.</p>
<h2>When to reset a Navien boiler</h2>
<p>Occasionally, your boiler may experience faults that require you to press the reset button. If there's a problem with your boiler, like a faulty heat exchanger or water heater, it can shut down completely, known as a 'lockout'.</p>
<p>A boiler will perform a lockout to preserve your safety and avoid a more severe fault occurring. When this happens, you should perform a system reset. Additionally, you may have to reset your boiler if there's a problem with the power supply or a power cut.</p>
<p>You should be aware that resetting your Navien boiler may not fix the issue, and you may need to contact technical support or a Gas Safe registered engineer to investigate the problem further. Where this is the case, the control panel or screen may show an error message or code you can look up in your Navien boiler's instructions.</p>
<p>As with all machines, a mechanical or electrical fault can occur at any time, so it's essential you&nbsp;<a href="https://www.boxt.co.uk/home-cover" rel="follow">get your boiler serviced</a> regularly.</p>

Choose BOXT Home Cover to protect your boiler

<h2>Can you reset a Navien boiler yourself?</h2>
<p><a href="https://www.boxt.co.uk/boilers/guides/boiler-not-firing-up" rel="follow">Resetting your boiler</a> is a straightforward process, so if you feel confident doing it, you can save time and money by doing it yourself. Before you do, read your boiler's manual. You must also wait before pressing the reset button again, as pressing it multiple times in quick succession could cause further problems.</p>
<h2>How to reset a Navien boiler</h2>
<p>Specific reset processes will vary based on the model of the Navien boiler you own. To help you, we've outlined the steps to resetting different Navien models below.</p>
<h3>NCB300</h3>
<p>To reset a Navien NCB300, press the Power button. If this doesn't work, refer to the troubleshooting section of the instruction manual.</p>
<h3>LCB700, NCB700 &amp; NCB500</h3>
<p>Press the Back button to reset an NCB500 boiler. If this doesn't work, contact Navien tech support or consult the manual's troubleshooting section.</p>
<h3>NCB-24LDWE</h3>
<p>Press the Reset button on the system's front panel if an error code appears.</p>
<h2>What happens after you reset your Navien boiler?</h2>
<p>Depending on the extent of the problem, your Navien boiler will either show an error code on its panel display or resolve the issue automatically and get straight back to working as expected.</p>
<p>If your <a href="https://www.boxt.co.uk/boilers" rel="follow">boiler</a> reset has gone to plan, the boiler will fire up as expected, and any error messages will disappear. The reset procedure can take a couple of minutes, so avoid pressing the reset button multiple times - this can cause further complications.</p>
<h2>When to call a professional</h2>
<p>If you press the reset button and the error code persists, contact a trained professional for <a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">boiler repairs</a>. You should report any problems quickly so an engineer can fix them before they worsen.</p>
<p>For more <a href="https://www.boxt.co.uk/guides?tag=boiler-maintenance" rel="follow">boiler maintenance</a> advice, check out our blog's dedicated section. Here, you'll find tips and information on everything, from <a href="https://www.boxt.co.uk/boilers/guides/clearing-an-airlock-from-your-central-heating-system" rel="follow">how to clear an airlock</a> to <a href="https://www.boxt.co.uk/boilers/guides/how-to-clean-magnetic-filter-on-boiler" rel="follow">how to clean a magnetic filter</a> and more.</p>

How to reset a Navien boiler

<h2>Who are Navien boilers?</h2>
<p>Navien is the fourth largest boiler manufacturer in the world and has been the market leader for boilers in Asia for decades before it entered the UK market back in 2014.&nbsp;</p>
<p>It has invested heavily in product development, creating the largest single-site heating product manufacturing facility in the world, producing around 2 million units per year.&nbsp;</p>
<p>Navien offers combi, system and standard boilers, available as gas and oil-powered models, with a wide range of power outputs, so you can <a href="https://www.boxt.co.uk/find-a-boiler/">find Navien a boiler</a> to suit any home.</p>
<h2>Are Navien boilers good quality?</h2>
<p><a href="https://www.boxt.co.uk/boilers/navien-boilers" rel="follow">Navien boilers</a> are built with high-quality stainless steel components for optimum durability and performance and pocket-friendly prices. Before leaving the factory, <strong>every boiler undergoes a thorough, two-stage testing procedure,</strong> including a robotised process that completes 55 checks per second. Every unit is then given a full working test by an operative to complete a <strong>further 250 quality checks</strong>.</p>
<p>For further peace of mind, their boilers are backed by <strong>warranties of up to 12 years</strong>, where Navien will repair or replace the boiler if it breaks down during the warranty period* (subject to terms and conditions).</p>
<h2>What are prices like for Navien boilers?</h2>
<p>At BOXT, we offer fixed and fair price quotes for Navien boilers, and with our <a href="https://www.boxt.co.uk/boilers/the-boxt-price-promise">BOXT Price Promise</a>, we&rsquo;ll beat any like-for-like quote - and give you a &pound;50 voucher if we can&rsquo;t!</p>
<p>We offer a full Navien boiler installation <strong>for just &pound;1,650 all-in or &pound;11 a month</strong>. Or, you can get one via our BOXT Life boiler subscription plans, where for just &pound;30 a month, you get a <a href="https://www.boxt.co.uk/boilers/boiler-replacement" rel="follow">new boiler</a> installed, a new wireless thermostat, and all servicing, maintenance and repairs included for the full 10-year plan, with a fix-or-replace guarantee if anything goes wrong.&nbsp;</p>
<p>Get a fixed-price quote in just 90 seconds for a <a href="https://www.boxt.co.uk/boilers/boiler-installation" rel="follow">boiler installation</a>&nbsp;or a <a href="https://www.boxt.co.uk/boilers/subscription">BOXT Life boiler subscription</a> plan.&nbsp;</p>

Get a fixed-price quote for a new boiler installation in just 90 seconds

<p>Now, let&rsquo;s take a closer look at the boilers that Navien offers&hellip;</p>
<h2>Navien Combi Boilers</h2>
<p>Navien offers a range of gas and oil combi boilers, with outputs ranging from 21kW through to a whopping 54kW depending on the model and fuel type.&nbsp;</p>
<p><a href="https://www.boxt.co.uk/boilers/guides/what-size-boiler-do-i-need">Learn about boiler sizes.</a></p>
<h3>Navien Gas Combi Boilers</h3>
<p>Navien has three gas-powered combi boilers options: the NCB 300, NCB 500, and their latest addition - the super powerful &ldquo;combi-crossover&rdquo; NCB 700 (which is an <strong>Energy Saving Awards winner for Domestic Heating Product of the Year</strong>).&nbsp;</p>
<p>These models come with a range of warranty lengths, from 5 all the way up to 12 years, so you can be confident your boiler is covered in the unlikely event that something goes wrong.&nbsp;</p>
<h3>Navien Oil Combi Boilers</h3>
<p>Oil boilers are a great option for homes that aren&rsquo;t connected to the gas grid, such as those in remote rural areas. Navien&rsquo;s oil combi model, the LCB700, comes in a range of power outputs from 21kW up to 36kW as an indoor or outdoor unit, giving plenty of choice to find the perfect option for homes of any size.&nbsp;</p>
<h2>Navien System Boilers</h2>
<p>Just like the combi range, Navien&rsquo;s system boilers are available as either gas or oil-powered models and also come in a wide range of power outputs from 20kW up to 36kW.&nbsp;</p>
<h3>Navien Gas System Boilers</h3>
<p>Ideal for powering larger homes with high water demand, Navien&rsquo;s gas-powered system boiler, the NCB-CE, is available in outputs from 20kW to 33kW and comes with a 7-year manufacturer-backed warranty.&nbsp;</p>
<h3>Navien Oil System Boilers</h3>
<p>With the same name and variations as the oil combi option, Navien&rsquo;s LCB700 oil system boiler comes in 21kW, 28kW and 36kW outputs, with a choice of having it as either an indoor or outdoor unit.&nbsp;</p>
<h2>So, should you get a Navien boiler?</h2>
<p>It may be new to the UK market, but as the fourth largest boiler manufacturer in the world, <a href="https://www.boxt.co.uk/boilers/navien-boilers" rel="follow">Navien</a> is certainly a brand you can trust. With every product going through hundreds of rigorous quality checks, you can feel confident that your new boiler has been built to an exceptional standard, with the added peace of mind that it&rsquo;s covered by a manufacturer-backed warranty of up to 12 years.&nbsp;</p>

Learn

Navien Boilers - Review & Prices 2024

Boxt engineer explaining boilers to a customer

Wondering whether to install a biomass boiler or a gas boiler? At BOXT, we’ve put together this guide to help you decide on which boiler is better for your home.

<p>Considering whether to switch to biomass? Or should you remain with a gas <a href="https://www.boxt.co.uk/boilers/" rel="follow">boiler</a>? From cost, to space, to environmental factors, deciding whether to choose a biomass or gas boiler can be difficult.</p>
<p>In this guide, we'll be going through and comparing these two boilers to see which one is right for you. At BOXT, we want to ensure you have all the necessary information to make a choice that suits you and your needs.</p>
<p>So, let's take a look at these two boilers to see which one is best for your home.&nbsp;</p>
<h2>How do biomass boilers work?</h2>
<p>Biomass boilers are a renewable energy source that burns wood pellets, plants and other natural waste to generate heat for the home. They work similarly to other standard boilers, except they do not burn fossil fuels like gas, oil or coal.</p>
<p>The heat goes through a combustion chamber, turning it into a hot gas. This gas travels through the flue duct and heat exchanger, where the heat is absorbed by the water running through your central heating system.</p>
<h2>How do gas boilers work?</h2>
<p>As the name suggests, gas boilers run on natural gas or liquid petroleum gas (LPG) and are the most common type of boiler in the UK.</p>
<p>When a boiler burns natural gas, it must come through an underground network of pipes. On the other hand, LPG can be stored in cylinders that need replacing regularly.</p>
<p>The gas is burnt and the heat produced is transferred via a heat exchanger into the primary water of your central heating system. This heat in turn is then either used to heat spaces within your property or the water that you bathe or wash in. There are three types of gas boilers you can choose from:</p>
<h3>1. Standard boilers</h3>
<p><a href="https://www.boxt.co.uk/boilers/guides/what-is-a-standard-boiler" rel="follow">Standard boilers</a> (also known as regular boilers, conventional boilers or heat-only boilers) use hot water cylinders and water tanks to store and supply your home with hot water and heating via hot water being pumped around your radiators.</p>
<p>These boilers tend to be rather large and require a lot of space, but if your boiler were to break down as a heat source, your system would still be able to provide hot water potentially via an electrical immersion heater located usually within your hot water cylinder.</p>
<h3>2. System boiler</h3>
<p>A system boiler is slightly different to a standard boiler as the pump for the system and other components are situated inside the boiler itself.</p>
<p>The boiler produces hot water by burning gas and transferring this heat into the primary system water. This is then either pumped around your radiators to heat your home or pumped up to a separate &nbsp;hot water cylinder where it heats the water you bathe and wash with. They are commonly combined with an unvented hot water cylinder. If you live in a <a href="https://www.boxt.co.uk/boilers/guides/what-is-the-best-boiler-for-a-large-house" rel="follow">large property</a>, this type of cylinder is excellent for supplying good hot water pressure to multiple taps simultaneously.&nbsp;</p>
<h3>3. Combi boiler</h3>
<p>A <a href="https://www.boxt.co.uk/boilers/combi-boilers" rel="follow">combi boiler</a> is a single unit with no hot water cylinder or tank. These boilers are great because they are compact if you live somewhere with little space. They are designed to supply hot water on demand.</p>
<p>They are also quick to install, <a href="https://www.boxt.co.uk/boilers/guides/how-much-does-a-new-boiler-cost" rel="follow">cost-effective</a> and energy-efficient.</p>

Check out everything you need to know about combi boilers, including why they're well suited to your home and how they work.

We've got you covered...

Want to find out more about combi boilers?

<h2>The differences between biomass boilers and gas boilers</h2>
<p>Now we understand biomass and gas boilers a little better, let's go through the different criteria you need to compare when choosing which one is right for you.</p>
<h3>Biomass vs gas boilers: Price</h3>
<p>Depending on the boiler type (standard, system or combi), a gas boiler can cost anywhere between &pound;1,500 to &pound;3,500. A good <a href="https://www.boxt.co.uk/boilers/worcester-bosch-boilers" rel="follow">Worcester Bosch combi boiler</a>, for example, costs around &pound;2,000 - a considerably more affordable option than a biomass boiler.</p>
<p>The cost of a biomass boiler can vary greatly depending on the brand, the fuel and the boiler type. These factors could affect the cost of a biomass boiler and make things slightly more affordable. The biggest price point comes from the type of biomass boiler you choose: manual or automatic.</p>
<p>A manual biomass boiler is where you will need to feed your boiler with pellets rather than letting the boiler automatically do this for you. Manual boilers can cost between &pound;4,000 and &pound;10,000, whereas an automatic pellet-feeding boiler can cost as much as &pound;20,000.</p>
<p>Other than boiler type, your fuel choice will also matter. There are three fuel types a biomass boiler can typically use: wood chips, wood logs and wood pellets.</p>
<ul>
<li><strong>Wood chip - </strong>Although this fuel type is fairly cheap, it isn't suitable for domestic use. This boiler only works on 60kW, which is insufficient to fuel most households.</li>
<li><strong>Wood logs - </strong>Wood logs are great for many households. The cost of wood logs can be &pound;100 per tonne and &pound;500 annually. Although wood logs are a good option, you'll need to consider where you'll store them, how you'll keep things clean and how you&rsquo;ll prepare them since the older the log, the better the fuel.</li>
<li><strong>Wood pellets -</strong> The most popular fuel type for biomass boilers is wood pellets. They're small and easier to store, easier to transport, lowers carbon emissions and ultimately, costs less.</li>
</ul>
<p>Biomass boilers are more expensive but since they use renewable energy, there are ways you can make them cheaper. The Renewable Heat Incentive (RHI) helps households fund their biomass boiler by giving them &pound;2,000 and &pound;3,500 a year for seven years. Switching from electricity to biomass, you can save &pound;340 to &pound;650; oil to biomass is &pound;335 to &pound;470, and gas to biomass is &pound;25 to &pound;80 in savings.</p>
<p>Despite the initial upfront costs, biomass boilers have cheaper running costs than gas boilers. Biomass fuel is cheaper per kW than gas as wood can easily be supplied for free. It's also unlikely that you would need to install a brand-new central heating system for your <a href="https://www.boxt.co.uk/boilers/boiler-replacement" rel="follow">new boiler</a> to function properly. Biomass boilers are a long-term investment.</p>
<h3>Biomass vs gas boilers: Installation</h3>
<p>Biomass boilers can take some time to install, depending on how big the unit is. Generally speaking, it should take an installer one to two days to fit a biomass boiler into your home. The labour costs are around &pound;200 to &pound;250 a day though this will vary according to who you hire and where you live.</p>
<p>Before installation, you must consider whether the boiler is manual or automatic and where you'll store your materials. Unlike a gas boiler, biomass boilers are more complicated and expensive, which means you must have a registered plumber or professional who can install the boiler for you.</p>
<p>Since biomass boilers are more complex, gas boilers may be what you're after. Most UK homes were built for gas boilers and so all necessary pipework and storage are already installed. Before doing anything, you should consult a Gas Safe registered engineer who can advise you on the best ways to install your boiler.</p>
<h3>Biomass vs gas boilers: Space requirements</h3>
<p>As briefly mentioned, <strong>biomass boilers can be quite large</strong> and, therefore, need quite a lot of space.</p>
<p>Somewhere like a garage or outdoor shed can usually accommodate a biomass boiler and helps separate it from your home. Biomass boilers include fuel storage, a tank, an expansion vessel and a chimney that occupy around 10 square metres of space.</p>
<p>If you're struggling for space, you also try using a hand-fed boiler with a hopper. These are smaller (3-5 square metres) but you'll be feeding pellets manually. You also need to consider how each part of your boiler will be able to function. For example, your fuel storage needs to be easy to access so wood deliveries can be made, and your chimney needs to be tall and have nothing to block it.</p>
<h4>Gas boilers, on the other hand, come in various sizes.</h4>
<p>A standard boiler will require a large amount of space, either in a loft, basement or outside unit, whereas a system boiler will either need a large or medium area. These two boilers, however, can produce plenty of heat for larger properties.</p>
<p>For smaller properties, combi boilers are more compact as they don&rsquo;t require a storage cylinder or tank, making them perfect for smaller properties and flats but less suitable for larger properties.</p>
<p>Generally speaking, in addition to the dimensions of the actual boiler unit, a boiler should have the following available space:</p>
<ul>
<li>20 cm above</li>
<li>20 cm below</li>
<li>60 cm surrounding</li>
</ul>
<h3>Biomass vs gas boilers: Maintenance &amp; lifespan</h3>
<p>All boilers should be regularly cleaned and inspected, especially during the first year of installation, to make sure that the boiler is running smoothly.</p>
<p>Considering how much ash will be produced from burning biomass, these boilers will need to be cleaned, ideally weekly, to remove all the residue that could block up the system. This requires a lot more effort than a gas boiler, as you'll only need to check for leaks, temperature drops and potential signs of limescale, which can all be done fairly swiftly by a Gas Safe registered engineer.</p>
<p>Although some biomass systems can self-clean, these will cost a lot more. If you're cleaning your system yourself, you must ensure it has all shut down before you can begin.</p>
<p>If your boiler is still under warranty, you must have an <a href="https://www.boxt.co.uk/boilers/guides/need-an-annual-service-we-can-help" rel="follow">annual service</a> check. Otherwise, you risk invalidating your warranty.</p>
<p>Having regular maintenance checks and <a href="https://www.boxt.co.uk/boilers/boiler-servicing" rel="follow">boiler servicing</a> from a registered engineer can ensure that your boiler is functioning correctly. If properly maintained, the lifespan of a gas boiler could be between 10 to 15 years and 10 to 20 years for a biomass boiler.</p>
<h3>Biomass vs gas boilers: Energy efficiency</h3>
<p>Biomass boilers have a higher efficiency rating of around 80% to 90% than the standard fossil fuel boiler.</p>
<p>However, with that said, biomass boilers require a lot more upkeep than gas boilers, as you need to supply them with fuel and clean them often.</p>
<p>Although gas boilers are less eco-friendly, they can produce higher temperatures in a short amount of time. Biomass also relies on deliveries and for its fuel to be dry in order to burn. Their unreliability makes them more concerning than gas boilers, which you can depend on no matter the circumstances.</p>
<h2>So, what's the verdict&hellip; which type of boiler is best for you?</h2>
<p>While we have laid out all the necessary information, the decision is ultimately down to you and your situation.</p>
<p>Money is perhaps the biggest factor when it comes to purchasing a boiler. Although biomass boilers are more eco-friendly, the upfront initial costs are much more expensive than a gas boiler.</p>
<p>Biomass boilers &nbsp;are also not great for those living in small properties. They are a big unit that requires a lot of storage which someone living in a flat may struggle with. In that case, combi boilers would be your best option.</p>
<p>Considering the number of wood pellets and chimney space required, biomass boilers may also be more suitable for those living in rural places. Congested cities may not be able to accommodate a biomass boiler as efficiently.</p>

Biomass vs gas boilers: Which is best for your home?

Engineer installing a boiler in someone's kitchen.

If you’re in need of a new boiler and choosing between Viessmann and Worcester Bosch, read BOXT’s comparison guide to find out which one is best for your home.

<p>There are many things to consider when buying a new <a href="https://www.boxt.co.uk/boilers" rel="follow">boiler</a>, including the brand's reputation, your own specific requirements and, of course, the costs.</p>
<p>Viessmann and Worcester Bosch are two of the most respected boiler brands on the market, and they both have a wide variety of efficient and reliable options for <a href="https://www.boxt.co.uk/boilers" rel="follow">new boilers</a>.</p>
<p>If you&rsquo;re in the market for a <a href="https://www.boxt.co.uk/boilers/boiler-replacement" rel="follow">boiler replacement</a> and doing your brand research, we&rsquo;ve got you covered. Our team of experts here at BOXT have compared these two reputable brands, focusing on their ranges of combi boilers so you can decide which is the best option for you.</p>
<p>Choosing a new boiler brand can be overwhelming - if you&rsquo;re not sure whether Viessmann or Worcester Bosch boilers are right for you, check out our other boiler comparison guides.&nbsp;</p>
<h2>Who are Viessmann and Worcester Bosch?</h2>
<p>Viessmann and Worcester Bosch are two big names in the boiler industry that everyone has likely heard of.</p>
<p>With their focus on boiler longevity and heating homes in the most efficient way, they&rsquo;re both reliable brands when it comes to choosing a new boiler. Time to delve a little deeper into each of the boiler brands&hellip;</p>
<h3>Introduction to Viessmann Boilers</h3>
<p>Viessmann was founded in 1917 and is based in Allendorf, Germany, but manufactures heating equipment in 74 countries. Although the brand is relatively new to the UK market, its boilers are growing in reputation and popularity due to their energy efficiency and reliability.</p>
<p>The brand's current most popular <a href="https://www.boxt.co.uk/boilers/combi-boilers" rel="follow">combi boiler</a> range is the <a href="https://www.viessmann.co.uk/en/products/gas/vitodens.html" rel="follow noopener" target="_blank">Vitodens</a> line which is becoming well-known for its brilliant technical specifications and dependability.</p>
<h3>Introduction to Worcester Bosch Boilers</h3>
<p>Formed in 1962, <a href="https://www.boxt.co.uk/boilers/worcester-bosch-boilers" rel="follow">Worcester Bosch</a> has long been the market leader in the UK after merging with the German-based Bosch group.</p>
<p>Worcester Bosch boilers are renowned for their high-quality manufacturing and the excellent aftercare they provide customers.</p>
<p>The brand's Greenstar boiler range features their most popular models of combi boilers and offers many different options in terms of power outputs and prices.</p>
<h2>Viessmann vs. Worcester Bosch boilers: Pros and cons</h2>
<p>At a glance, here is a round-up of the pros and cons of both Viessmann and Worcester Bosch boilers.&nbsp;</p>
<table border="1" style="border-collapse: collapse; width: 100%; height: 39.1876px;"><colgroup><col style="width: 50%;"><col style="width: 50%;"></colgroup>
<tbody>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;"><strong>Viessmann</strong></td>
<td style="height: 19.5938px;"><strong>Worcester Bosch</strong></td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">
<p><strong>Pros</strong></p>
<ul>
<li>Their boilers include patented stainless steel heat exchangers, which reduce the risk of corrosion and increase reliability</li>
<li>The Viessmann Vitodens 200w combi can achieve an energy efficiency of up to 98%</li>
<li>Viessmann's combi boilers are compatible with Weather Compensation controls which reduces wastage and energy bills</li>
</ul>
<p><strong>Cons</strong></p>
<ul>
<li>Viessmann boilers only come with a 5-year labour and parts warranty as standard</li>
</ul>
</td>
<td style="height: 19.5938px;">
<p><strong>Pros</strong></p>
<ul>
<li>Worcester Bosch has industry-leading aftercare and customer service</li>
<li>Their boilers come with a 10-year guarantee as standard when installed by a Worcester Bosch Accredited Installer</li>
<li>Bosch EasyControl smart thermostat makes it easy to control your heating and hot water and save money on your energy bills, all from your phone.</li>
</ul>
<p><strong>Cons</strong></p>
<ul>
<li>Worcester Bosch is one of the pricier boiler brands</li>
</ul>
</td>
</tr>
</tbody>
</table>
<h2>Viessmann vs. Worcester Bosch boilers: Technology</h2>
<table border="1" style="border-collapse: collapse; width: 100%;"><colgroup><col style="width: 50%;"><col style="width: 50%;"></colgroup>
<tbody>
<tr>
<td><strong>Viessmann</strong></td>
<td><strong>Worcester Bosch</strong></td>
</tr>
<tr>
<td>
<p>Some of the best technology Viessmann boilers offer include:</p>
<p>The Viessmann Vitodens range of combi boilers can be equipped with <a href="https://viessmanndirect.co.uk/AdditionalDepartments/Header-Content/Weather-Compensation" rel="follow noopener" target="_blank">Weather Compensation</a> controls that use outdoor sensors to detect the external temperature and automatically adjust the temperature inside the home accordingly.</p>
<p>This greatly reduces energy waste and can help users save money on their energy bills.</p>
</td>
<td>
<p>Some of the best technology Worcester Bosch boilers offer include:</p>
<p>Many Worcester Bosch combi boilers have <a href="https://www.worcester-bosch.co.uk/products/boiler-controls/bosch-easycontrol" rel="follow">smart thermostat</a> capabilities, which can connect to Nest and Hive.</p>
<p>This allows 7-day scheduling through a smartphone app, and smart home boilers like this give users greater control of their energy usage and efficiency.</p>
</td>
</tr>
</tbody>
</table>
<h2>Viessmann vs. Worcester Bosch boilers: Size</h2>
<p>Size is an important factor to consider when choosing a <a href="https://www.boxt.co.uk/boilers/boiler-replacement" rel="follow">new boiler.</a> Whether the boiler sits neatly inside a cupboard or is housed in the utility room, it needs to fit correctly so it doesn&rsquo;t get in the way or stand out like a sore thumb in your space.</p>
<p>One of the benefits of installing combi boilers instead of other types, such as system boilers, is their compact size, and they can be hung on a wall in your home out of the way.</p>
<p>Check out the size comparison between Viessmann vs. Worcester Bosch boilers:</p>
<table border="1" style="border-collapse: collapse; width: 100%;"><colgroup><col style="width: 50.0535%;"><col style="width: 50.0535%;"></colgroup>
<tbody>
<tr>
<td><strong>Viessmann</strong></td>
<td><strong>Worcester Bosch</strong></td>
</tr>
<tr>
<td>
<p><span style="font-family: Lato, Helvetica, Arial, sans-serif;">The Viessmann Vitodens 200-W combi boiler has a height of 700mm, a width of 450mm and a depth of 360mm. The other combis in this boiler range also have a similar small size.</span></p>
</td>
<td>
<p>Worcester Bosch offers a full range of boiler types in different sizes.&nbsp;</p>
<p>The Worcester Bosch Greenstar 8000 Life 30kW boiler, for example, has a slightly larger size of 780mm in height, 440mm in width and 365mm in depth.</p>
</td>
</tr>
</tbody>
</table>
<p>Although the Worcester Bosch model is larger than a Viessmann boiler, combi boilers from both brands are usually compact and can fit inside cupboards.</p>
<h2>Viessmann vs. Worcester Bosch boilers: Features</h2>
<table border="1" style="border-collapse: collapse; width: 100%;"><colgroup><col style="width: 50%;"><col style="width: 50%;"></colgroup>
<tbody>
<tr>
<td><strong>Viessmann</strong></td>
<td><strong>Worcester Bosch</strong></td>
</tr>
<tr>
<td>
<p>Some of the best features of the Viessmann boiler range include:</p>
<ul>
<li>Smart thermostat compatibility with smart technologies such as Nest</li>
<li>Viessmann boilers have noise reduction technology to keep quiet in your home</li>
<li>Many models feature a touchscreen display</li>
<li>Built-in shock arrestors</li>
<li>Combined PRV and condensate pipe</li>
<li>Weather compensation</li>
</ul>
</td>
<td>
<p>Some of the best features of the Worcester Bosch boiler range include:</p>
<ul>
<li>Keyless filling links are built into the system, making it easier to refill</li>
<li>Frost protection</li>
<li>Wireless connectivity with Bosch EasyControl smart thermostat</li>
<li>Smart controls</li>
<li>Temperature display</li>
</ul>
</td>
</tr>
</tbody>
</table>
<h2>Viessmann vs. Worcester Bosch boilers: kW output</h2>
<p>It goes without saying that your new boiler will need to be powerful enough to adequately heat your home, whatever its size.</p>
<p>System boilers are the right choice if you have a large house with more than one bathroom.</p>
<p>A combi boiler will have enough power to heat your home for people living in more standard-sized homes with 15 or fewer radiators.</p>
<table border="1" style="border-collapse: collapse; width: 100%;"><colgroup><col style="width: 50%;"><col style="width: 50%;"></colgroup>
<tbody>
<tr>
<td><strong>Viessmann</strong></td>
<td><strong>Worcester Bosch</strong></td>
</tr>
<tr>
<td><span style="font-family: Lato, Helvetica, Arial, sans-serif;">The most powerful of Viessmann's combi boiler models is the Vitodens 200-W which has a maximum central heating (CH) output of 35kW and a maximum domestic hot water output (DHW) of 30.5kW.</span></td>
<td><span style="font-family: Lato, Helvetica, Arial, sans-serif;">The Worcester Bosch Greenstar 8000 Lifestyle range is available up to 50kW for combi and regular boilers and 35kW for system boilers, making this the most powerful combi boiler on the market.</span></td>
</tr>
</tbody>
</table>
<h2>Viessmann vs. Worcester Bosch boilers: Efficiency</h2>
<table border="1" style="border-collapse: collapse; width: 100%;"><colgroup><col style="width: 50%;"><col style="width: 50%;"></colgroup>
<tbody>
<tr>
<td><strong>Viessmann</strong></td>
<td><strong>Worcester Bosch</strong></td>
</tr>
<tr>
<td>Due to its stainless steel heat exchanger with unmatched wall thickness, the Vitodens 200w combi can achieve incredible efficiency ratings of up to 98%.&nbsp;</td>
<td>
<p>All of the gas boilers in the Greenstar range have an efficiency rating of at least 92%, and most of the models, such as the Greenstar CDi Compact, have 94% efficiency levels.</p>
<p>The most energy-efficient Worcester Bosch boiler, the Greenstar 28CDi Compact, boasts an efficiency rating of up to 99.5% when working at 30% capacity.&nbsp;</p>
</td>
</tr>
</tbody>
</table>
<h2>Viessmann vs. Worcester Bosch boilers: Warranty &amp; guarantee</h2>
<table border="1" style="border-collapse: collapse; width: 100%;"><colgroup><col style="width: 50%;"><col style="width: 50%;"></colgroup>
<tbody>
<tr>
<td><strong>Viessmann</strong></td>
<td><strong>Worcester Bosch</strong></td>
</tr>
<tr>
<td>
<p>A Viessmann boiler will come with a 5-year parts and labour warranty as standard, but this can be extended to 10 years if a Viessmann-trained installer carries out the boiler installation.</p>
<p>There are also chargeable options on certain models, such as the Vitodens 200-W combi that can extend the warranty even further to 12 years.</p>
</td>
<td>
<p>Worcester Bosch offers a 10-year guarantee on their boilers as standard, which means that they will replace or repair your boiler without requiring an inspection.</p>
<p>However, their labour and parts warranties vary depending on the model. For example, the Greenstar 8000 combi will have a 12-year warranty as long as a Worcester-accredited engineer installs it.</p>
</td>
</tr>
</tbody>
</table>
<h2>Viessmann vs. Worcester Bosch boilers: Ratings &amp; awards</h2>
<table border="1" style="border-collapse: collapse; width: 100%;"><colgroup><col style="width: 50%;"><col style="width: 50%;"></colgroup>
<tbody>
<tr>
<td><strong>Viessmann</strong></td>
<td><strong>Worcester Bosch</strong></td>
</tr>
<tr>
<td>
<p>Viessmann boilers were given the Which? Best Buy Status for three consecutive years in 2017, 2018 and 2019. They also received a 5 out of 5 score in the Which? Annual Boiler Survey, which ranks brands based on build quality, customer score, reliability and engineer recommendation.</p>
<p>Viessmann also currently has a rating of 4.4 out of 5 on Trustpilot, which is based on over 3,500 customer reviews, and in 2019 they received the IF Design Award for the Vitodens 300.</p>
</td>
<td>
<p>Worcester Bosch has a 4.6 rating on Trustpilot based on over 32,000 customer reviews, and they have had the Which? Best Buy Status for 11 years.</p>
<p>They were also awarded the 'Best Domestic Boiler Manufacturer Award' at the 2020 Build Magazine's Home and Garden Awards for their products' outstanding performance and the brand's overall reliability.</p>
</td>
</tr>
</tbody>
</table>
<h2>Viessmann vs. Worcester Bosch boilers: Price</h2>
<p>When it comes to price, there's not a huge amount of difference between the two brands' premium models of combi boilers which reflects the high quality of their products.</p>
<p>If we take a look at two of their flagship boiler models:</p>
<table border="1" style="border-collapse: collapse; width: 100%; height: 72.7813px;"><colgroup><col style="width: 50.0535%;"><col style="width: 50.0535%;"></colgroup>
<tbody>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;"><strong>Viessmann</strong></td>
<td style="height: 19.5938px;"><strong>Worcester Bosch</strong></td>
</tr>
<tr style="height: 53.1875px;">
<td style="height: 53.1875px;">
<p>The Viessmann 050-W 29kW comes at a cost of &pound;1,695.</p>
</td>
<td style="height: 53.1875px;">
<p>The Worcester Bosch Greenstar 25i starts at &pound;1,900.</p>
</td>
</tr>
</tbody>
</table>
<p></p>

Check out our Ideal vs. Baxi boilers comparison guide to help with your decision making

Working out which boiler brand is right for you?

Check out our other boiler comparison guides

<h2>Viessmann vs. Worcester Bosch boilers: Models</h2>
<p>We&rsquo;ve compared the popular Viessmann and Worcester models - the Viessmann Vitodens vs. the Worcester Bosch Greenstar.</p>
<h3>Viessmann boiler models&nbsp;</h3>
<table border="1" style="border-collapse: collapse; width: 100%; height: 195.938px;"><colgroup><col style="width: 16.6845%;"><col style="width: 16.6845%;"><col style="width: 16.6845%;"><col style="width: 16.6845%;"><col style="width: 16.6845%;"><col style="width: 16.6845%;"></colgroup>
<tbody>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;"><strong>Boiler Name</strong></td>
<td style="height: 19.5938px;"><strong>Fuel Type</strong></td>
<td style="height: 19.5938px;"><strong>Available in</strong></td>
<td style="height: 19.5938px;"><strong>Efficiency</strong></td>
<td style="height: 19.5938px;"><strong>Hot water flow rate</strong></td>
<td style="height: 19.5938px;"><strong>Warranty</strong></td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">
<p>Vitodens 050-W Combi Boiler</p>
</td>
<td style="height: 19.5938px;">Gas</td>
<td style="height: 19.5938px;">25 kW, 30 kW, 35 kW</td>
<td style="height: 19.5938px;">92%</td>
<td style="height: 19.5938px;">10.2 l/min (25kW)<br>12.2 l/min (30kW)<br>14.3 l/min (35kW)</td>
<td style="height: 19.5938px;">
<p>Standard: 3 years<br>Trained Installer: 7 years</p>
<p>Extended warranty for</p>
<p>Trained Installer: 10 Years (additional fee applies)</p>
</td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">
<p>Vitodens 100-W Combi</p>
</td>
<td style="height: 19.5938px;">Gas</td>
<td style="height: 19.5938px;">26 kW, 30 kW, 35 kW</td>
<td style="height: 19.5938px;">Up to 98%</td>
<td style="height: 19.5938px;">13.3 l/min (26kW)<br>15.6 l/min (30kW)<br>17.0 l/min (35kW)</td>
<td style="height: 19.5938px;">
<p>Standard: 5 years</p>
<p>Trained Installer: 5 years</p>
<p>Extended warranty for Trained Installer: 7, 10 or 12 Years (additional fee applies)</p>
</td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">Vitodens 200-W 30kW Combi Boiler</td>
<td style="height: 19.5938px;">Gas</td>
<td style="height: 19.5938px;">30 kW, 35 kW</td>
<td style="height: 19.5938px;">Up to 98%</td>
<td style="height: 19.5938px;">15.69 l/min (30kW)<br>17 l/min (35kW)</td>
<td style="height: 19.5938px;">
<p>Standard: 3 years</p>
<p>Trained Installer: 5 years</p>
<p>Extended warranty for Trained Installer: 10 or 12 Years (additional fee applies)</p>
</td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">
<p>Vitodens 050-W System Boiler</p>
</td>
<td style="height: 19.5938px;">Gas</td>
<td style="height: 19.5938px;">19 kW, &nbsp;25 kW</td>
<td style="height: 19.5938px;">92%</td>
<td style="height: 19.5938px;"></td>
<td style="height: 19.5938px;">
<p>Standard: 3 years</p>
<p>Trained Installer: 7 years</p>
<p>Extended warranty for Trained Installer: 10 Years (additional fee applies)</p>
</td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">
<p>Vitodens 100-W System Boiler</p>
</td>
<td style="height: 19.5938px;">Gas</td>
<td style="height: 19.5938px;">11 kW, 19 kW, 25 kW, 32 kW</td>
<td style="height: 19.5938px;">Up to 98%</td>
<td style="height: 19.5938px;"></td>
<td style="height: 19.5938px;">
<p>Standard: 5 years</p>
<p>Trained Installer : 5 years</p>
<p>Extended warranty for Trained Installer: 7, 10 or 12 Years (additional fee applies)</p>
</td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">
<p>Vitodens 200-W System Boiler<br><br></p>
</td>
<td style="height: 19.5938px;">Gas</td>
<td style="height: 19.5938px;">11 kW, 19 kW, 25 kW, 32 kW</td>
<td style="height: 19.5938px;">Up to 98%</td>
<td style="height: 19.5938px;"></td>
<td style="height: 19.5938px;">
<p>Standard: 3 years</p>
<p>Trained Installer: 5 years</p>
<p>Extended warranty for Trained Installer: 10 or 12 Years (additional fee applies)</p>
</td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">
<p>Vitodens 100-W B1GA Heat Only</p>
</td>
<td style="height: 19.5938px;">Gas</td>
<td style="height: 19.5938px;">11 kW, 16 kW, 19 kW, 25 kW, 32 kW</td>
<td style="height: 19.5938px;">92%</td>
<td style="height: 19.5938px;"></td>
<td style="height: 19.5938px;">
<p>Standard: 5 years</p>
<p>Trained Installer: 5 years</p>
<p>Extended warranty for Trained Installer: 7, 10 or 12 Years (additional fee applies)</p>
</td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">
<p>Vitodens 111-W Storage Boilers</p>
</td>
<td style="height: 19.5938px;">Gas</td>
<td style="height: 19.5938px;">25 kW, 32 kW</td>
<td style="height: 19.5938px;">98%</td>
<td style="height: 19.5938px;">20.1 l/m (25kW)<br>21.2 l/m (32kW)</td>
<td style="height: 19.5938px;">
<p>Standard: 5 years</p>
<p>Trained Installer: 5 years</p>
<p>Extended warranty for Trained Installer: 7, 10 or 12 Years (additional fee applies)</p>
</td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">
<p>Vitodens 222-F Storage Combi</p>
</td>
<td style="height: 19.5938px;">Gas</td>
<td style="height: 19.5938px;">19 kW, 25 kW, 32 kW</td>
<td style="height: 19.5938px;">94%</td>
<td style="height: 19.5938px;"></td>
<td style="height: 19.5938px;">
<p>Standard: 3 years</p>
<p>Trained Installer: 5 years</p>
<p>Extended warranty for Trained Installer: 10 or 12 Years (additional fee applies)</p>
</td>
</tr>
</tbody>
</table>
<h3>Worcester Bosch boiler models&nbsp;</h3>
<table border="1" style="border-collapse: collapse; width: 100%; height: 1007.68px;"><colgroup><col style="width: 16.6845%;"><col style="width: 16.6845%;"><col style="width: 16.6845%;"><col style="width: 16.6845%;"><col style="width: 16.6845%;"><col style="width: 16.6845%;"></colgroup>
<tbody>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;"><strong>Boiler Name</strong></td>
<td style="height: 19.5938px;"><strong>Fuel Type</strong></td>
<td style="height: 19.5938px;"><strong>Available in</strong></td>
<td style="height: 19.5938px;"><strong>Efficiency</strong></td>
<td style="height: 19.5938px;"><strong>Hot water flow rate</strong></td>
<td style="height: 19.5938px;"><strong>Warranty</strong></td>
</tr>
<tr style="height: 78.375px;">
<td style="height: 78.375px;">Greenstar 8000 Combi Boiler<br><br></td>
<td style="height: 78.375px;">Gas</td>
<td style="height: 78.375px;">30 kW, 40 kW, 45kW and 50kW</td>
<td style="height: 78.375px;">94%</td>
<td style="height: 78.375px;">12.3 l/min (30kW), &nbsp;16.4 l/min (40kW), 18.3 l/min (45kW) 20.3 l/min (50kW)</td>
<td style="height: 78.375px;">Up to 12 years when installed by a Worcester Accredited Installer</td>
</tr>
<tr style="height: 78.375px;">
<td style="height: 78.375px;">Greenstar i Combi Boiler</td>
<td style="height: 78.375px;">Gas</td>
<td style="height: 78.375px;">25kW, 30kW</td>
<td style="height: 78.375px;">94%</td>
<td style="height: 78.375px;">9 l/min (25kW), 10.8 l/min (30kW)</td>
<td style="height: 78.375px;">Up to 10 years when installed by a Worcester Accredited Installer</td>
</tr>
<tr style="height: 137.156px;">
<td style="height: 137.156px;">Greenstar Si Compact Combi Boiler<br><br><br><br><br></td>
<td style="height: 137.156px;">Gas</td>
<td style="height: 137.156px;">25kW, 30kW</td>
<td style="height: 137.156px;">94%</td>
<td style="height: 137.156px;">8.9l/min (25kW), 10.7l (30kW)</td>
<td style="height: 137.156px;">Up to 10 years when installed by a Worcester Accredited Installer</td>
</tr>
<tr style="height: 78.375px;">
<td style="height: 78.375px;">Greenstar CDi Compact Combi Boiler</td>
<td style="height: 78.375px;">Gas</td>
<td style="height: 78.375px;">28kW, 32kW, 36kW</td>
<td style="height: 78.375px;">94%</td>
<td style="height: 78.375px;">10 l/min (28kW), 11.5 l/min (32kW), 12.9 l/min (36kW)</td>
<td style="height: 78.375px;">Up to 10 years when installed by a Worcester Accredited Installer</td>
</tr>
<tr style="height: 78.375px;">
<td style="height: 78.375px;">Greenstar CDi Highflow Combi Boiler</td>
<td style="height: 78.375px;">Gas</td>
<td style="height: 78.375px;">29kW, 30kW</td>
<td style="height: 78.375px;">92%</td>
<td style="height: 78.375px;">20 l/min (29kW), 25 l/min (30kW)</td>
<td style="height: 78.375px;">Up to 10 years when installed by a Worcester Accredited Installer</td>
</tr>
<tr style="height: 78.375px;">
<td style="height: 78.375px;">Greenstar Heatslave II Combi Boiler<br><br></td>
<td style="height: 78.375px;">Oil</td>
<td style="height: 78.375px;">18kW, 25kW, 32kW</td>
<td style="height: 78.375px;">90%</td>
<td style="height: 78.375px;">15 l/min (18kW), 18 l/min (25kW), 22 l/min (32kW)</td>
<td style="height: 78.375px;">Up to 5 years when installed by a Worcester Accredited Installer</td>
</tr>
<tr style="height: 137.148px;">
<td style="height: 137.148px;">Greenstar 2000 Combi Boiler</td>
<td style="height: 137.148px;">Gas</td>
<td style="height: 137.148px;">25kW, 30kW</td>
<td style="height: 137.148px;">93%</td>
<td style="height: 137.148px;">9 l/min (25kW), 10.8l/min (30kW)</td>
<td style="height: 137.148px;">Up to 6 years when installed by a Worcester Accredited Installer</td>
</tr>
<tr style="height: 78.375px;">
<td style="height: 78.375px;">Greenstar 8000 Life Combi Boiler</td>
<td style="height: 78.375px;">Gas</td>
<td style="height: 78.375px;">30kW, 35kW</td>
<td style="height: 78.375px;">94%</td>
<td style="height: 78.375px;">12.3 l/min (30kW), 14.3 l/min (35kW)</td>
<td style="height: 78.375px;">Up to 12 years when installed by a Worcester Accredited Installer</td>
</tr>
<tr style="height: 97.9688px;">
<td style="height: 97.9688px;">Greenstar 8000 Style Combi Boiler</td>
<td style="height: 97.9688px;">Gas</td>
<td style="height: 97.9688px;">30kW, 35kW, 40kW, 45kW, 50kW</td>
<td style="height: 97.9688px;">94%</td>
<td style="height: 97.9688px;">12.3 l/min (30kW), 14.3 l/min (35kW), 16.4 l/min (40kW), 18.3 l/min (45kW) 20.3 l/min (50kW)</td>
<td style="height: 97.9688px;">Up to 12 years when installed by a Worcester Accredited Installer</td>
</tr>
<tr style="height: 125.969px;">
<td style="height: 125.969px;">
<p>Greenstar i System Boiler</p>
</td>
<td style="height: 125.969px;">Gas</td>
<td style="height: 125.969px;">9kW, 12kW, 15kW, 18kW, 21kW, 24kW</td>
<td style="height: 125.969px;">94%</td>
<td style="height: 125.969px;"></td>
<td style="height: 125.969px;">Up to 10 years when installed by a Worcester Accredited Installer</td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">
<p>GB162 System Boiler<br><br></p>
</td>
<td style="height: 19.5938px;">Gas</td>
<td style="height: 19.5938px;">50kW, 65kW, 85kW, 100kW</td>
<td style="height: 19.5938px;">93%</td>
<td style="height: 19.5938px;"></td>
<td style="height: 19.5938px;">Up to 2 years</td>
</tr>
</tbody>
</table>
<h2>Viessmann vs. Worcester Bosch boilers: Which boiler brand is best for you?</h2>
<p>The Worcester Bosch and Viessmann boiler ranges are quite evenly matched regarding power outputs, and the prices of their premium combi models are fairly similar.</p>
<p>However, which <a href="https://www.boxt.co.uk/boilers" rel="follow">boiler</a> brand you choose will depend on the most important deciding factors for you and your home. In terms of warranty and reputation, Worcester Bosch is a clear winner.</p>
<p>Worcester Bosch is still the most trusted boiler manufacturer in the UK. Their range of Greenstar combi boilers is an excellent choice for people looking for a high-quality product with a long, 10-year warranty as standard.&nbsp;</p>
<p>If cost is one of the key deciding factors on your boiler buying journey, Viessmann boiler models start at a slightly lower price point without compromising on durability and efficiency. However, if you want to match the longer warranty period, it will come at an extra cost.&nbsp;</p>
<p>If you would like more information on boilers, you can read BOXT's <a href="https://www.boxt.co.uk/boilers/guides" rel="follow">boiler guides</a> which will give you extra knowledge about boilers and their maintenance. Alternatively, get in touch with our team of experts today.&nbsp;</p>

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Viessmann vs. Worcester Bosch boilers - An updated review and comparison for 2024

Back boilers reached their height of popularity during the 70s and 80s and are still fuelling many of the UK's central heating systems. Sitting right behind your fireplace, a boiler that fits perfectly, tucked away without the need for any extra space in the house.

<p>Back boilers reached their height of popularity during the 70s and 80s and are still fuelling many of the UK's central heating systems. Sitting right behind your fireplace, a <a href="https://www.boxt.co.uk/boilers" rel="follow">boiler</a> that fits perfectly, tucked away without the need for any extra space in the house.</p>
<p><strong>The UK government made installing new back boilers illegal in 2005</strong> when building regulations made it a requirement to install only high-efficiency condensing boilers. Although many have now been replaced by wall-hung condensing boilers, there are still a large number of back boilers in use across the UK.</p>
<p>The following article will provide you with all you need to know about back boilers, how much a back boiler replacement costs, and what alternatives are out there that won&rsquo;t break the bank.</p>
<h2>What are back boilers?</h2>
<p>Back boilers came into fashion around the 1960s as an easy and out-of-sight option behind a fireplace, chimney or stove, as a way of providing heat and hot water to homes across the UK.&nbsp;</p>
<h2>How do back boilers work?</h2>
<p>Back boilers were built to save space for a heat source, and they are designed to fit in the fire opening behind a fireplace and use the same chimney to disperse the gases.</p>
<p>The back boiler features a cold water inlet source located at the bottom. The heat exchanger then heats this cold water and sends it to the output using an electrical pump. To make sure pressure doesn&rsquo;t build up, hot water is kept in a hot water cylinder that features an overflow vent.&nbsp;</p>
<h2>Why is it illegal to install a back boiler?</h2>
<p>As <a href="https://www.boxt.co.uk/boilers/combi-boilers">combi boilers</a> and gas or oil boilers took over the market after the 1980s, the parts for repairing or replacing a back boiler became less and less available.<span style="font-size: 11pt; font-family: Arial; color: rgb(0, 0, 0);"></span></p>
<p>However, the main drawback is their inefficiency. While most modern <a href="https://www.boxt.co.uk/boilers">boilers</a> have the ability to provide up to 98% efficiency, all new gas boilers have a minimum performance standard of 92% (ErP). However, a back boiler can provide maximum efficiency of 80%, making them incapable of meeting today's efficiency requirements.&nbsp;<span style="font-size: 11pt; font-family: Arial; color: rgb(0, 0, 0);"></span></p>
<p>This low-efficiency rating will greatly increase the energy consumption within your home, as well as affect your carbon footprint.&nbsp;</p>
<h3>Risks associated with back boilers&nbsp;</h3>
<p>There are also some risks associated with back boilers.&nbsp;<span style="font-size: 11pt; font-family: Arial; color: rgb(0, 0, 0);"></span></p>
<p>Back boilers have a life expectancy of 20-30 years. However, as the boiler ages, the risks associated with back boilers only increase.&nbsp;<span style="font-size: 11pt; font-family: Arial; color: rgb(0, 0, 0);"></span></p>
<ul>
<li>When a back boiler is reused after being out of use for an extended period, residual water heats up and creates pressure which can be very dangerous.</li>
<li>As the fireplace is close to the boiler, the heat and gas trapped in the fireplace without the use of a flue pipe can cause the boiler to explode.</li>
<li>Poor ventilation and a lack of access to fresh air can result in toxic fumes building up in the home.</li>
</ul>
<p>Whilst these occurrences are rare, if you do observe your back boiler overheating or suspect any other problems, call a heating engineer immediately.&nbsp;</p>
<h3>Other cons associated with back boilers</h3>
<p>There are also several other problems associated with back boilers:</p>
<ul>
<li>They aren&rsquo;t able to provide instant hot water</li>
<li>The ventilation system can be a source of noise and draughts</li>
<li>Back boilers depend on chimneys which can be problematic if you want to do building work</li>
<li>Back boiler parts are limited, so replacing damaged parts is difficult</li>
<li>Back boilers constantly expand and contract, which can cause structural damage to your home</li>
</ul>
<h2>The cost of removing a back boiler</h2>
<p>If you&rsquo;ve decided to upgrade your heating system, you&rsquo;ll likely want to know how much it will cost.&nbsp;<span style="font-size: 11pt; font-family: Arial; color: rgb(0, 0, 0);"></span></p>
<p>Firstly, you&rsquo;ll have two options:<span style="font-size: 11pt; font-family: Arial; color: rgb(0, 0, 0);"></span></p>
<ul>
<li>Remove your back boiler</li>
<li>Or decommission your back boiler (disconnect from the gas)</li>
</ul>
<p>If you choose to remove your back boiler entirely, you should expect to pay around &pound;3,500 to &pound;4,500 for the whole process, including having your new boiler installed.&nbsp;<span style="font-size: 11pt; font-family: Arial; color: rgb(0, 0, 0);"></span></p>
<p>However, decommissioning your back boiler is the cheaper option (and will save your house from being turned upside down), and you can expect to pay between &pound;3,000 and &pound;4,000 for the whole process and new installation.&nbsp;</p>
<h2>Back boiler alternatives</h2>
<p>Many options are available if you&rsquo;re looking at replacing your back boiler. However, you might not know what&rsquo;s best for you and your home.&nbsp;</p>
<p>Read on to find an alternative to your back boiler:</p>
<h3>Combi boiler</h3>
<p>This might be the best option if you live in a smaller property that doesn&rsquo;t have 2 or 3 bathrooms being used simultaneously.&nbsp;</p>
<p>Probably one of the most popular systems currently available in the UK, an A-rated combi boiler heats your water and radiators from the same unit and therefore doesn't require a lot of space or extra parts.</p>
<p>Combi boilers can run on gas, oil, LPG or electricity, which makes them very versatile and one of the UK's favourites due to the following benefits:</p>
<ul>
<li>Cheapest option and very energy efficient</li>
<li>Small size</li>
<li>Hot water on demand</li>
</ul>
<p>You can expect to pay anywhere from &pound;1,500, all the way up to &pound;3,500 for a new combi boiler - including installation.&nbsp;</p>
<p>For a closer look into combi boilers, take a look at our guide - <a href="https://www.boxt.co.uk/boilers/guides/combi-boiler-pros-cons-a-simple-guide">Combi Boiler Pros &amp; Cons: A Simple Guide</a>.&nbsp;</p>
<h3>System boiler</h3>
<p>If you have a home with several bathrooms and thus a higher water consumption, you might opt for a system boiler.</p>
<p>They require a hot water cylinder to function, so they take up more space than a combi boiler. However, this means that a large amount of hot water can be stored for hours at a time.&nbsp;</p>
<p>A system boiler comes with several other benefits:</p>
<ul>
<li>Economical and efficient</li>
<li>It can be combined with solar energy</li>
<li>Easy installation</li>
<li>Quick to heat your home</li>
</ul>
<p>Prices for a system boiler can be anything from &pound;2,000 - &pound;2,500.</p>
<p>For a closer look at system boilers, take a look at our guide - <a href="https://www.boxt.co.uk/boilers/guides/what-is-a-system-boiler">What Is A System Boiler?</a></p>
<h3>Standard boiler</h3>
<p>These boilers can be a great way to produce heat and hot water at high volumes. Standard boilers are a great choice for larger homes with multiple bathrooms.&nbsp;<span style="font-size: 11pt; font-family: Arial; color: rgb(0, 0, 0);"></span></p>
<p>A standard boiler uses hot and cold water storage tanks, usually installed in your loft, to supply water to the mains.&nbsp;<span style="font-size: 11pt; font-family: Arial; color: rgb(0, 0, 0);"></span></p>
<p>Whilst standard boilers aren&rsquo;t as common as they used to be, you can still purchase these boilers at the cost of &pound;2,000 to &pound;3,000.&nbsp;<span style="font-size: 11pt; font-family: Arial; color: rgb(0, 0, 0);"></span></p>
<p>For more information, discover our guide - <a href="https://www.boxt.co.uk/boilers/guides/what-is-a-standard-boiler">What Is A Standard Boiler?</a></p>
<h3>Biomass boilers</h3>
<p>These boilers offer an alternative to gas, LPG or electricity by using pellets that can be sustainably sourced.&nbsp;<span style="font-size: 11pt; font-family: Arial; color: rgb(0, 0, 0);"></span></p>
<p>The cost of biomass boilers can vary depending on the size, make and model, but you can generally expect to pay between &pound;7,000 and &pound;15,000.&nbsp;</p>
<h2>Replace your back boiler with BOXT</h2>
<p>There are many good reasons you should replace your back boiler sooner than later:&nbsp;</p>
<ul>
<li>Save money</li>
<li>Be more energy-efficient</li>
<li>Be more environmentally friendly</li>
<li>Eliminate the risks associated with back boilers</li>
</ul>
<p>Which <a href="https://www.boxt.co.uk/boilers" rel="follow">boiler</a> replacement option you end up going for depends on your requirements. Consider factors such as water demand for your home and how vital instant hot water is to you and your family. Whether your house has one or more bathrooms plays a significant role, as well as whether you will have enough space to house a water storage tank.</p>
<p>Thanks to the plethora of options for a <a href="https://www.boxt.co.uk/boilers/boiler-replacement" rel="follow">new boiler</a> at BOXT, you have access to boilers that will be fitted precisely to your needs.&nbsp;</p>
<p>Or why not try <a href="https://www.boxt.co.uk/boilers/subscription">BOXT Life</a> - from only &pound;35 per month, you&rsquo;ll receive a brand new boiler with installation, unlimited <a href="https://www.boxt.co.uk/boilers/boiler-repair">boiler repairs</a>, replacement and servicing, and a Google Nest thermostat - all with no deposit needed.&nbsp;</p>
<p style="margin-top: 12pt; margin-bottom: 12pt;"></p>

Are back boilers now illegal?

BOXT take an updated look at Vaillant vs Worcester Bosch boilers for 2024 - read our comparison guide here.

<p>If your <a href="https://www.boxt.co.uk/boilers" rel="follow">boiler</a> is struggling to perform and you find yourself constantly forking out for repairs to keep it running, it might be time for a <a href="https://www.boxt.co.uk/boilers/boiler-replacement" rel="follow">new boiler</a>.</p>
<p>While replacing and upgrading your boiler might be a high upfront cost, it can save you money in the long run, not only in your energy bills but on repairs, too. You may also want to consider taking out boiler cover for peace of mind that you&rsquo;re covered should you have any unexpected issues with your boiler and that your annual <a href="https://www.boxt.co.uk/boilers/boiler-servicing" rel="follow">boiler service</a> will be taken care of.</p>
<p>There are some important decisions you need to make when selecting a new boiler - do you need a <a href="https://www.boxt.co.uk/boilers/guides/what-is-a-combi-boiler" rel="follow">combi boiler</a>, standard boiler or a <a href="https://www.boxt.co.uk/boilers/guides/what-is-a-system-boiler" rel="follow">system boiler</a>, and what about the make and model? &nbsp;Thankfully, our team of experts are on hand to provide you with the information you need to make an informed decision.</p>
<p>Take a look at some of our other <a href="https://www.boxt.co.uk/guides?category=boilers" rel="follow">boiler guides</a> to help you find and install the perfect boiler for your home.</p>
<h2>Who are Vaillant and Worcester Bosch?</h2>
<p><a href="https://www.boxt.co.uk/boilers/guides/how-to-choose-your-perfect-boiler" rel="follow">Choosing a new boiler</a> isn't easy, but buying from large and popular boiler manufacturers offers peace of mind. Vaillant and Worcester Bosch are two of the largest manufacturers on the market. They offer an extensive range of <a href="https://www.boxt.co.uk/boilers/guides/types-of-boiler" rel="follow">boiler types</a> and sizes to suit all homes.</p>
<h3>Introduction to Vaillant boilers</h3>
<p><a href="https://www.boxt.co.uk/boilers/vaillant-boilers" rel="follow">Vaillant</a> is a German, family-owned business that dates back to 1874. The company is headquartered in Remscheid and has been active in the UK boiler market since the 1970s.<br>The brand has sites across the UK and is known for its heating and cooling products, including an extensive boiler range. Their strong reputation was bolstered in 2020 after being awarded "Best Buy" status by Which?</p>
<p>They have a strong Trustpilot rating of 4.5 out of 5 based on almost 19,000 reviews.</p>
<h3>Introduction to Worcester Bosch boilers</h3>
<p>In 1962, the UK-based Worcester brand merged with the Germany-based Bosch group to form Worcester Bosch. Since then, <a href="https://www.boxt.co.uk/boilers/worcester-bosch-boilers" rel="follow">Worcester Bosch</a> has built a reputation as one of the most reliable and trusted boiler manufacturers in the UK.</p>
<p>Worcester Bosch currently offers a range of products, including gas and oil boilers as well as hot water cylinders. They also have a great selection of renewable technologies like heat pumps and solar water heating systems.</p>
<p>The King&rsquo;s Sandringham Estate has granted Worcester Bosch a warrant to supply boilers. This shows that their products and services have earned the Royal seal of approval!<br>Worcester Bosch has an impressive Trustpilot rating of 4.6 out of 5 from over 35,000 reviews. They were even named the 2020 Home and Gardens Awards' best domestic boiler manufacturer.</p>
<p>As you can see, both brands are well-trusted names that could be excellent for your next boiler</p>
<h2>Vaillant vs. Worcester Bosch: Boiler technology</h2>
<table border="1" style="border-collapse: collapse; width: 100%;"><colgroup><col style="width: 49.9607%;"><col style="width: 49.9607%;"></colgroup>
<tbody>
<tr>
<td><strong>Worcester Bosch</strong></td>
<td><strong>Vaillant</strong></td>
</tr>
<tr>
<td>
<p>Worcester Bosch's smart home boilers feature digital controls, 7-day scheduling abilities, and mechanical controls that enable 24-hour programming.</p>
<p>Additionally, Bosch EasyControl, the brand's <a href="https://www.boxt.co.uk/smart-home/guides/smart-thermostat-v-traditional-thermostat" rel="follow">smart thermostat</a>, can be linked to Amazon Alexa and Google Assistant for seamless integration.</p>
</td>
<td>
<p>Many Vaillant boilers use stainless steel heat exchangers. This improves efficiency and can offer a longer life than the aluminium heat exchanger found in Worcester Bosch models.</p>
<p>The Vaillant vSMART app uses state-of-the-art technology to offer remote and easy control of their latest boilers. You will be able to enjoy a wireless connection to efficiently run your central heating. It's available for iOS and Android users and even works with your Amazon Echo. Vaillant boilers also offer precision heating and are smart thermostat compatible.</p>
</td>
</tr>
</tbody>
</table>
<h2>Vaillant vs. Worcester Bosch: Boiler price</h2>
<p>When considering a <a href="https://www.boxt.co.uk/boilers" rel="follow">boiler</a> for your home, the price will be a significant deciding factor for most. Boilers are expensive pieces of equipment, so it's crucial to invest in the best possible model.</p>
<table border="1" style="border-collapse: collapse; width: 100%; height: 179.156px;"><colgroup><col style="width: 49.9607%;"><col style="width: 49.9607%;"></colgroup>
<tbody>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;"><strong>Worcester Bosch</strong></td>
<td style="height: 19.5938px;"><strong>Vaillant</strong></td>
</tr>
<tr style="height: 159.562px;">
<td style="height: 159.562px;">
<p>Worcester Bosch is renowned for its premium quality, which is reflected in its prices. In fact, its boilers are multi-award-winning and have proven to be more than capable of meeting high usage levels, making them a worthwhile investment.</p>
<p>Worcester Bosch boilers range in price from <strong>&pound;700 for a compact model </strong>to<strong> &pound;2500 for a top-of-the-range option</strong>.&nbsp;</p>
</td>
<td style="height: 159.562px;">
<p>Vaillant is considered a premium boiler brand. This means you can expect to pay a little more. But for your extra money, you will enjoy great efficiency and reliability.</p>
<p>On average, you can expect to pay between&nbsp;<strong>&pound;2,500 and &pound;3,000 </strong>for<strong> </strong>Vaillant<strong> </strong>boilers and installation.</p>
</td>
</tr>
</tbody>
</table>
<p>When you buy a boiler from BOXT, the price quoted includes installation and set-up fees, so you can avoid any surprises.</p>
<h2>Vaillant vs. Worcester Bosch: Boiler features</h2>
<table border="1" style="border-collapse: collapse; width: 100%; height: 39.1876px;"><colgroup><col style="width: 50%;"><col style="width: 50%;"></colgroup>
<tbody>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;"><strong>Worcester Bosch</strong></td>
<td style="height: 19.5938px;"><strong>Vaillant</strong></td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">
<p>Some of the best Worcester Bosch features include:</p>
<ul>
<li>Manufacturer-backed guarantee for up to 12 years for peace of mind</li>
<li>Widely recognised as one of the most reliable boiler brands in the UK</li>
<li>Easy-to-use controls with clear temperature displays</li>
<li>All units come with a CondenseSure syphon for frost protection</li>
<li>Their boilers have some of the highest energy efficiency ratings in the market</li>
</ul>
</td>
<td style="height: 19.5938px;">
<p>Some of the best Vaillant features include:</p>
<ul>
<li>Precision heating</li>
<li>vSMART heating control</li>
<li>Smart thermostat compatibility</li>
<li>Long warranties</li>
<li>Excellent customer service to ensure customers are well looked after</li>
</ul>
</td>
</tr>
</tbody>
</table>
<h2>Worcester Bosch vs Vaillant: Boiler guarantees and aftercare</h2>
<table border="1" style="border-collapse: collapse; width: 100%; height: 39.1876px;"><colgroup><col style="width: 49.9607%;"><col style="width: 49.9607%;"></colgroup>
<tbody>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;"><strong>Worcester Bosch</strong></td>
<td style="height: 19.5938px;"><strong>Vaillant</strong></td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">
<p><span style="font-family: Lato, Helvetica, Arial, sans-serif;">When you choose a Worcester Bosch boiler direct from the manufacturer, you have the option of a 5, 10, or 12-year guarantee, depending on the model and installation method you select.</span><span style="font-family: Lato, Helvetica, Arial, sans-serif;"></span></p>
</td>
<td style="height: 19.5938px;">
<p>Extended guarantees are possible by using a Vaillant advance installer to install your boiler. They must be registered within 30 days of the installation. The information required for registration includes:</p>
<ul>
<li><strong>Installation date</strong></li>
<li><strong>Boiler serial number</strong></li>
<li><strong>Address</strong></li>
<li><strong>Gas Safe registration number of the installer</strong></li>
</ul>
<p>Guarantees for a Vaillant combi boiler will typically run for between 2 and 7 years when purchased directly from the manufacturer. The Vaillant labour warranty also protects homeowners for 90 days.</p>
</td>
</tr>
</tbody>
</table>
<h2>Worcester Bosch vs Vaillant: Boiler efficiency</h2>
<table border="1" style="border-collapse: collapse; width: 100%; height: 232.344px;"><colgroup><col style="width: 49.9607%;"><col style="width: 49.9607%;"></colgroup>
<tbody>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;"><strong>Worcester Bosch</strong></td>
<td style="height: 19.5938px;"><strong>Vaillant</strong></td>
</tr>
<tr style="height: 212.75px;">
<td style="height: 212.75px;">
<p>Worcester Bosch has a long-standing reputation for producing some of the most efficient boilers in the market. Its Greenstar range is no exception.</p>
<p>One of its standout models is the Greenstar 28CDi Compact, which boasts an impressive A-rating and an efficiency level of 94%.</p>
<p>With the addition of a smart controller, the efficiency level of the Greenstar 28CDi Compact can be further increased to an impressive 98%. This makes it one of the most efficient boilers on the market.</p>
</td>
<td style="height: 212.75px;">
<p>The most popular Vaillant boilers have an average efficiency rating of 94%. Its vSMART app improves efficiency, as it allows greater control over your boiler.</p>
<p>Vaillant's built-in precision heating is another great feature. It maximises efficiency and helps to lower fuel bills.&nbsp;</p>
</td>
</tr>
</tbody>
</table>
<h2>Worcester Bosch vs. Vaillant: Boiler size and power output</h2>
<p>The power output of a <a href="https://www.boxt.co.uk/boilers/boiler-replacement" rel="follow">new boiler</a> is essential to performance. It has to be big enough to meet the hot water requirements of bathrooms, kitchens, and the central heating system.</p>
<p>An oversized boiler can be an equally poor choice. It can lead to poor energy efficiency and energy wastage.</p>
<p>The physical size of the boiler is also important. This will dictate where the boiler can be installed. If it is to be fitted in a cupboard or cabinet, it must be able to fit comfortably and allow space for maintenance.</p>
<table border="1" style="border-collapse: collapse; width: 100%; height: 232.344px;">
<tbody>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px; width: 50.1784%;"><strong>Worcester Bosch</strong></td>
<td style="height: 19.5938px; width: 49.8216%;"><strong>Vaillant</strong></td>
</tr>
<tr style="height: 212.75px;">
<td style="height: 212.75px; width: 50.1784%;">
<p>Worcester Bosch has a great selection of options depending on the power output you require. Models are available in kW outputs ranging from 25kW right up to 50kW. This means that if you have a larger home with increased heating and hot water requirements, a Worcester Bosch boiler could be perfect for you.</p>
<p>The Worcester Bosch Greenstar Ri standard boiler measures 390 mm x 600 mm x 270 mm (W, H, D). This makes it suitable for a range of spaces.</p>
</td>
<td style="height: 212.75px; width: 49.8216%;">
<p></p>
<p>Vaillant boilers offer outputs to suit most properties. This includes the ecoTEC pro combi that comes with outputs of 24kW, 28kW and 30kW.</p>
<p>The ecoTEC plus combi by Vaillant packs a bit more punch. This is available with 48kW and 64kW outputs.</p>
<p>Properties that require a compact model will benefit from the ecoFIT pure combi boiler that measures just 700 mm x 390 mm x 295 mm.</p>
<p></p>
</td>
</tr>
</tbody>
</table>
<p></p>

Why not check out our Ideal vs. Baxi boilers comparison guide to help inform your decision

Still deciding on a new boiler brand?

<h2>Vaillant boiler models</h2>
<p>With a great selection of combi and system boilers, Vaillant's boiler systems could be perfect for your home. Below are some of the most popular models from its extensive range.</p>
<table border="1" style="border-collapse: collapse; width: 100%;"><colgroup><col style="width: 16.6536%;"><col style="width: 16.6536%;"><col style="width: 16.6536%;"><col style="width: 16.6536%;"><col style="width: 16.6536%;"><col style="width: 16.6536%;"></colgroup>
<tbody>
<tr>
<td><strong>Boiler name</strong></td>
<td><strong>Fuel type</strong></td>
<td><strong>Available in</strong></td>
<td><strong>Efficiency</strong></td>
<td><strong>Hot water flow rate</strong></td>
<td><strong>Warranty</strong></td>
</tr>
<tr>
<td>ecoTEC exclusive with Green iQ combi</td>
<td>Gas &amp; &nbsp;LPG</td>
<td>35kW &amp; 43kW</td>
<td>89.7% (35kW) &amp; 89.6% (43kW)</td>
<td>14.5 l/min (35kW) 17.8 l/min (43kW)</td>
<td>Up to 10-year guarantee with Vaillant Advance Installer</td>
</tr>
<tr>
<td>ecoTEC plus combi</td>
<td>Gas</td>
<td>25kW, 32kW, 35kW, 38kW</td>
<td>89.3%</td>
<td>10.5 l/min (25kW) 13 l/min (32kW) 14.3 l/min (35kW) 15.9 l/min (38kW)</td>
<td>Up to 10-year guarantee with Vaillant Advance Installer</td>
</tr>
<tr>
<td>ecoTEC plus combination store</td>
<td>Gas</td>
<td>38kW</td>
<td>89.3%</td>
<td>15.9 l/min (38kW)</td>
<td>Up to 10-year guarantee with Vaillant Advance Installer</td>
</tr>
<tr>
<td>ecoTEC pro combi</td>
<td>Gas</td>
<td>24kW, 28kW, 30kW</td>
<td>89.3%</td>
<td>9.6 l/min (24kW) 11.1 l/min (28kW) 12.3 l/min (30kW)</td>
<td>Up to 7-year guarantee with Vaillant Advance Installer</td>
</tr>
<tr>
<td>ecoFIT pure combi</td>
<td>Gas</td>
<td>25kW, 30kW, 35kW</td>
<td>89% (25kW &amp; 30kW) 89.4% (35kW)</td>
<td>10.4 l/min (25kW) 12.2 l/min (30kW) 14.1 l/min (35kW)</td>
<td>Up to 10-year guarantee with Vaillant Advance Installer</td>
</tr>
<tr>
<td>ecoTEC exclusive with Green iQ system boilers</td>
<td>Gas &amp; &nbsp;LPG</td>
<td>27kW</td>
<td>89.6%</td>
<td></td>
<td>Up to 10-year guarantee with Vaillant Advance Installer</td>
</tr>
<tr>
<td>ecoTEC plus system boilers</td>
<td>Gas &amp; &nbsp;LPG</td>
<td>12kW, 15kW, 18kW, 24kW, 30kW, 37kw</td>
<td>89.3%, 89.2%, 89.6%, 89.6%, 89.7%, 89.5%</td>
<td></td>
<td>Up to 10-year guarantee with Vaillant Advance Installer</td>
</tr>
<tr>
<td>ecoTEC plus 48 and 64kW</td>
<td>Gas &amp; &nbsp;LPG</td>
<td>48kW, 64kW</td>
<td>ErP rating A+</td>
<td></td>
<td>5-year guarantee</td>
</tr>
</tbody>
</table>
<h2>Worcester Bosch boiler models</h2>
<p>Worcester Bosch combi boilers are known for their quality. The Worcester Bosch boiler range includes many oil and gas boilers, including the popular models listed below.</p>
<table border="1" style="border-collapse: collapse; width: 100%; height: 509.437px;"><colgroup><col style="width: 16.6667%;"><col style="width: 16.6667%;"><col style="width: 16.6667%;"><col style="width: 16.6667%;"><col style="width: 16.6667%;"><col style="width: 16.6667%;"></colgroup>
<tbody>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;"><strong>Boiler name</strong></td>
<td style="height: 19.5938px;"><strong>Fuel type</strong></td>
<td style="height: 19.5938px;"><strong>Available in</strong></td>
<td style="height: 19.5938px;"><strong>Efficiency</strong></td>
<td style="height: 19.5938px;"><strong>Hot water flow rate</strong></td>
<td style="height: 19.5938px;"><strong>Warranty</strong></td>
</tr>
<tr style="height: 58.7812px;">
<td style="height: 58.7812px;">Greenstar 8000 Combi Boilers</td>
<td style="height: 58.7812px;">Gas</td>
<td style="height: 58.7812px;">30 kW, 40 kW, 45kW and 50kW</td>
<td style="height: 58.7812px;">94%</td>
<td style="height: 58.7812px;">12.3 l/min (30kW), 16.4 l/min (40kW), 18.3 l/min (45kW) 20.3 l/min (50kW)</td>
<td style="height: 58.7812px;">Up to 12 years when installed by a Worcester Accredited Installer</td>
</tr>
<tr style="height: 58.7812px;">
<td style="height: 58.7812px;">Greenstar Si Compact Combi Boilers</td>
<td style="height: 58.7812px;">Gas</td>
<td style="height: 58.7812px;">25kW, 30kW</td>
<td style="height: 58.7812px;">94%</td>
<td style="height: 58.7812px;">8.9l/min (25kW), 10.7l (30kW)</td>
<td style="height: 58.7812px;">Up to 10 years when installed by a Worcester Accredited Installer</td>
</tr>
<tr style="height: 58.7812px;">
<td style="height: 58.7812px;">Greenstar CDi Compact Combi Boilers</td>
<td style="height: 58.7812px;">Gas</td>
<td style="height: 58.7812px;">28kW, 32kW, 36kW</td>
<td style="height: 58.7812px;">94%</td>
<td style="height: 58.7812px;">10 l/min (28kW), 11.5 l/min (32kW), 12.9 l/min (36kW)</td>
<td style="height: 58.7812px;">Up to 10 years when installed by a Worcester Accredited Installer</td>
</tr>
<tr style="height: 58.7812px;">
<td style="height: 58.7812px;">Greenstar CDi Highflow Combi Boilers</td>
<td style="height: 58.7812px;">Gas</td>
<td style="height: 58.7812px;">29kW, 30kW</td>
<td style="height: 58.7812px;">92%</td>
<td style="height: 58.7812px;">20 l/min (29kW), 25 l/min (30kW)</td>
<td style="height: 58.7812px;">Up to 10 years when installed by a Worcester Accredited Installer</td>
</tr>
<tr style="height: 58.7812px;">
<td style="height: 58.7812px;">Greenstar Heatslave II Combi Boilers</td>
<td style="height: 58.7812px;">Oil</td>
<td style="height: 58.7812px;">18kW, 25kW, 32kW</td>
<td style="height: 58.7812px;">90%</td>
<td style="height: 58.7812px;">15 l/min (18kW), 18 l/min (25kW), 22 l/min (32kW)</td>
<td style="height: 58.7812px;">Up to 5 years when installed by a Worcester Accredited Installer</td>
</tr>
<tr style="height: 58.7812px;">
<td style="height: 58.7812px;">Greenstar 2000 Combi Boiler</td>
<td style="height: 58.7812px;">Gas</td>
<td style="height: 58.7812px;">25kW, 30kW</td>
<td style="height: 58.7812px;">93%</td>
<td style="height: 58.7812px;">9 l/min (25kW), 10.8l/min (30kW)</td>
<td style="height: 58.7812px;">Up to 6 years when installed by a Worcester Accredited Installer</td>
</tr>
<tr style="height: 58.7812px;">
<td style="height: 58.7812px;">Greenstar 8000 Life Combi Boiler</td>
<td style="height: 58.7812px;">Gas</td>
<td style="height: 58.7812px;">30kW, 35kW</td>
<td style="height: 58.7812px;">94%</td>
<td style="height: 58.7812px;">12.3 l/min (30kW), 14.3 l/min (35kW)</td>
<td style="height: 58.7812px;">Up to 12 years when installed by a Worcester Accredited Installer</td>
</tr>
<tr style="height: 78.375px;">
<td style="height: 78.375px;">Greenstar 8000 Style Combi Boiler</td>
<td style="height: 78.375px;">Gas</td>
<td style="height: 78.375px;">30kW, 35kW, 40kW, 45kW, 50kW</td>
<td style="height: 78.375px;">94%</td>
<td style="height: 78.375px;">12.3 l/min (30kW), 14.3 l/min (35kW), 16.4 l/min (40kW), 18.3 l/min (45kW) 20.3 l/min (50kW)</td>
<td style="height: 78.375px;">Up to 12 years when installed by a Worcester Accredited Installer</td>
</tr>
<tr>
<td>Greenstar i System Boiler</td>
<td>Gas</td>
<td>9kW, 12kW, 15kW, 18kW, 21kW, 24kW</td>
<td>94%</td>
<td></td>
<td>Up to 10 years when installed by a Worcester Accredited Installer</td>
</tr>
</tbody>
</table>
<h2>Vaillant and Worcester Bosch Boilers from BOXT</h2>
<p>Both Worcester Bosch and Vaillant offer excellent options, making it difficult to choose between the two when deciding on a new boiler.</p>
<p>When it comes to cost, there isn't a huge amount of difference. Vaillant might come out as a bit more expensive, but they do offer other benefits, as their customer service and repair options edge them slightly ahead. Vaillant uses a stainless steel heat exchanger as opposed to Worcester Bosch, which uses aluminium heat exchangers.</p>
<p>Overall, they are both great options and choosing which one is right for you will vary depending on <a href="https://www.boxt.co.uk/boilers/guides/whats-the-average-uk-home-gas-usage" rel="follow">what your requirements are</a>.&nbsp;</p>
<p>If you're still deciding which boiler brand is best for your home, check out our other comparison guides, like <a href="https://www.boxt.co.uk/boilers/guides/baxi-vs-worcester-bosch" rel="follow">Baxi vs. Worcester Bosch boilers.</a></p>

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