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When your heating and hot water stop working, we know that the last thing you want is to wait days before a heating engineer can come and inspect the problem. That's why at BOXT, we offer next working day boiler replacement when you order your boiler before 3pm. Whether you have a&nbsp;<a href="https://www.boxt.co.uk/boilers/guides/what-is-a-system-boiler">system</a>, gas, or <a href="https://www.boxt.co.uk/boilers/combi-boilers" rel="follow">combi boiler</a>, your heating will be back up and running before you can say, "Wow, that was easy!"&nbsp;
Plus, with a&nbsp;<a target="_blank" rel="noopener noreferrer" href="https://www.boxt.co.uk/boilers/guides/boxt-workmanship-guarantee">12 month workmanship guarantee</a>, and up to&nbsp;10 year manufacturer-backed warranty, you can relax knowing that in the unlikely event that something isn't quite right,&nbsp;you're completely covered&nbsp;and we'll work with you to make it right.&nbsp;

a BOXT engineer at the front door with a tool bag to install a new boiler

Next day boiler replacement

Our most popular model and one of the quietest combi boilers available, the Greenstar 4000 is perfect for small and medium sized homes.

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Featuring a smart digital display so you can easily control your heating and hot water, plus a stainless steel heat exchanger to provide long-term efficiency.

This compact model fits seamlessly into your home, while offering plenty of power with quality components to ensure long-lasting reliability and efficiency.

One of the most powerful wall-hung boilers on the market, with amazing performance for a range of home sizes whilst working intelligently and efficiently.

Answer some questions about your home and get a tailored boiler replacement quote in minutes.

Discover

Compare brands, models and sizes to choose the perfect boiler for your home. Pay upfront or spread the cost in instalments.

Choose

Order online by 3pm to have your replacement boiler installed next working day by a BOXT accredited engineer. 

Install

Download the BOXT app to keep track of your installation and view all your important documents.

Maintain

How BOXT works

Even if your current boiler is still working, it&rsquo;s worth considering getting a boiler replacement before you're left without heating or hot water when you need it most&mdash;especially if your boiler is over 15 years old.
A key reason it's worth upgrading older boilers is because modern gas boilers are&nbsp;more energy efficient&nbsp;than old ones. In fact, depending on how old your existing boiler is and the type of home you live in, you could&nbsp;<a target="_blank" rel="noopener noreferrer" href="https://www.boxt.co.uk/boilers/guides/boiler-energy-saving">save over &pound;500 a year on your energy bills</a>&nbsp;with a new, A-rated boiler!&nbsp;
Plus with the addition of smart technology, it's simple to build a heating schedule and control the temperature in your home from anywhere. In fact, this extra efficiency can help save up to an extra 10% on your energy bills.

an A-rated boiler installed in an airing cupboard

Why get a boiler replacement?

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Spread the entire cost on selected boilers with up to

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All-inclusive worry-free BOXT Life boiler plan from

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All major credit and debit cards accepted so you can

Flexible boiler replacement payment options

Make <a href="https://www.boxt.co.uk/boilers" rel="follow">new boiler</a> installation simple with BOXT. We enjoy saving you time and money; that's why we regularly review our prices. In fact, we guarantee to beat any like-for-like boiler installation quote by &pound;50, so you can shop with peace of mind.

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Comparing boiler replacement costs?

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Rated Excellent on Trustpilot

<h2>Boiler replacements from leading brands</h2>
We&rsquo;re creatures of habit, and that&rsquo;s a-ok. BOXT stocks energy-efficient boilers from all the leading brands, meaning you can get a replacement you know you&rsquo;ll love.
The home heating industry can be complicated, but with BOXT, it doesn&rsquo;t have to be. Explore boilers from trusted brands to find your perfect replacement.

Worcester Bosch

Vaillant

Learn more about our range of Navien boilers

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Baxi

<h3 style="text-align: center;">Want to know more about replacing your boiler?</h3>
Check out our advice guides full of hints and tips from our expert BOXT accredited engineers.

When should you replace your boiler? 

How to prepare for a boiler replacement fitting

What are the best boiler brands?

*<a href="https://www.boxt.co.uk/spring-offer-free-hive-thermostat-mini-terms-conditions">Terms and Conditions apply</a> to free Hive Mini offer. Ends midnight, 31st August 2025.

Order a boiler replacement from BOXT by 3pm and get it installed the next working day. Flexible payment options available. 