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Signs it’s time for a boiler replacement

Your boiler should be an appliance you can always trust to deliver. Being an essential part of your home, it should be reliable and consistent - not something you should be worried about using. 

Sometimes things can go wrong with a boiler (as we all know). Does my boiler need replacing? What is an average boiler replacement cost? Fret no more. Here are the clear signs that your boiler is either broken or faulty, and the simple steps you can follow to help you through this pickle!

When to replace a boiler.

Your boiler is one of the most important pieces of technology in your home, so functionality is crucial at all times. If you have an older boiler which hasn’t been updated for a number of years, a possible replacement is necessary. It’s recommended that if your boiler is around 15 years old - buying a new one should be on the cards.

Boilers have developed significantly over the years. Rather than buying new bits and pieces every week, it may be worth buying a brand new one altogether. Although it may seem like a lot of money - you will save in the long term. Thanks to updated technology and higher energy efficiency - you can enjoy your life without the hassle of a dodgy boiler. 

Signs of a broken or faulty boiler:

There are a number of ways a boiler can become faulty. Each problem can show a number of warning signs to look out for. If you notice any of the following signs, please seek the help of a professional right away. These issues can also be identified during a boiler service.

1). Leaking or drips from your boiler.

Your boiler can begin to leak in many places. To really pinpoint the exact problem, you need to know where your boiler is leaking from. The most common cause of a leaking boiler is from a broken component inside the boiler. The pump seal or pressure valve could be damaged. If the pressure valve is the culprit, your boiler pressure may be too high. If it is the pump, then it may simply have become worn out from excessive or constant use over time.  

Other common places you may find leaks include the pipes of your system. This can be due to corrosion, so it’s best to get in touch with an engineer who will be able to correctly identify the problem.

2). Constant low boiler pressure.

Low boiler pressure can be caused by a number of things, including water leaks, bleeding radiators as well as the need for a new pressure valve. It’s easy to check the pressure of your boiler. All you need to do is look at the built in pressure gauge. If the needle is below 1, you may have a problem that needs addressing.   

If you’re finding you’re losing pressure quickly, even when repressurising your system - get in touch with an engineer to find out any underlying problem.

3). Banging or gurgling noises.

Excessive noises coming from your radiators or system is usually caused by air or by your water pressure being too low. Pump failure could also be a culprit - especially in older systems. Sometimes, the sound itself can be an indicator to the problem. 

For example - If the noise is a gurgle, bleeding your radiators can solve the problem. If there is a humming or vibrating in the system, this could signify that the heating elements are not working properly. This suggests there’s a fault.

4). Issues with your thermostat.

If your thermostat is switching itself on or off without any input from you OR losing its accuracy - then you may need a new one. This problem shouldn’t be anything to do with the boiler itself. Although, you may wish to get it checked - just to be sure!

The process of replacing a boiler.

A full boiler replacement should be completed only by a professional boiler engineer. There are a number of different boiler types to choose from:

If you’re unsure which type is the best for you, click on the links to see our separate boiler type guides.

When you’ve decided on the type of boiler you want, you need to organise the installation of your new one. BOXT have a range of high-quality boilers to suit your needs. We can uninstall your old boiler and replace it with your upgraded more reliable model - free of charge.

Here’s the quick process an engineer will go through to complete the installation:

  • To start with, your engineer will ensure they protect your home during the installation by covering all carpets, surfaces and furniture.
  • Then, you’ll be asked a series of questions by your engineer about your system. Such as your water pressure, the number of radiators you have, and the current position/location of your boiler.
  • If you’re having the same type of boiler fitted, e.g. you’re changing your old combi boiler for a new combi boiler - then the engineer can be all done within the same day. If you have an older system or you’re completely changing the type of boiler - the new installation may be longer.
  • Finally, ensure you get certification of your new appliance. Your engineer should present you with a ‘Building Regulations Certificate’ and a ‘Benchmark Certificate’ after installation. If you don’t receive them, you should ask for your records.

What to consider when replacing your boiler.

Boiler replacement can be a big investment. Before replacing your boiler, there is a lot to consider:


This is the obvious one. The price of a new boiler is definitely higher than replacing the odd component. However, if you keep replacing components every time they become faulty, you’ll be paying much more than the overall cost of a brand new boiler.


Unlike your old boiler, a new one is going to be much more reliable. With upgraded smart technology as well as ‘A’ rated efficiency - a brand new boiler will be a worthwhile investment.

Your engineer.

It’s important that you don’t try and uninstall an old boiler or install a new boiler yourself. A Gas Safe Registered engineer should be the only person for the job. There are a lot of engineers who will try and recommend boiler types and models that may benefit themselves and not you. 

Make sure you choose a company you can trust. BOXT personalise each recommendation to ensure you’re getting the exact gas boiler replacement you need for your home and circumstances.


A new boiler is always going to be more efficient than your old one. Thankfully, these days every new boiler manufactured must have an ‘A’ rating of efficiency. This means you can expect your boiler to have a 90% efficiency rate.

Replacement boiler cost.

The cost of a replacement boiler can be pricey from different manufacturers or companies. Some can even charge £2000 to £3000 for a standard, energy efficient combi boiler. With excellent prices and expert engineers - you’ll be glad to know that BOXT can offer you an array of top quality boilers that are available. 

Our brand-new high-quality boilers start at £1,795 or £11.61 per month. We even offer free installation too on all models. If you need any help with your boiler replacement or if you want a boiler to fit a specific requirement - BOXT are here for you.

Can I get help with replacing my boiler?

Absolutely! Here at BOXT, we’re committed to helping you find that perfect boiler for your home. Courtesy of the best boiler deals around - we’ll be there with you every step of the way meeting any needs/queries you have. We make finding a boiler super easy. Our online tool finds personalised recommendations just for you. 

Our ‘Find A Boiler’ tool is incredibly simple to use. Answer a few simple questions about your property and current boiler set up and we’ll recommend the best boilers for you. Better still - it’ll only take two minutes to complete!

Boiler replacement has never been easier or more affordable.

It’s more than worth going for a full boiler replacement instead of constantly upgrading different parts. You’ll have a much more reliable system and you’ll be saving plenty of money in the process. For advice and a new boiler quote - speak with one of our expert engineers today using our live chat option. They'll be happy to help!

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