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Signs It’s Time For A Boiler Replacement

If your boiler isn’t functioning as it should or it seems to be letting you down more often than not, then that should be an obvious sign something is wrong. Your boiler should be an appliance you can trust to deliver, not something you’re constantly scared to use in case of a break down.

Does my boiler need replacing? What is an average boiler replacement cost? This guide will detail the signs you should look out for with a faulty or broken boiler and the steps you can take to get back on your feet comfortably with a boiler replacement.

When to replace a boiler.

Your boiler is one of the most important pieces of technology in your home, which is one huge reason why it needs to be functioning correctly at all times. If you have an older boiler which hasn’t been upgraded for a number of years, then you should look into getting a boiler replacement. It’s recommended that if your boiler is around 15 years old, you should think about buying a new one with more upgraded technology and a higher energy efficiency rating.

If you’re wondering when to replace boiler components in a bid to save some money in the short term, it may be worth rethinking. If you’re constantly having to replace the different parts of your boiler, you’ll end up spending much more money in the long term than if you had a complete new boiler replacement.

Signs of a broken or faulty boiler.

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

Leaking or drips from your boiler.

Your boiler can begin to leak in many places, so 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.

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 re-pressurising your system, get in touch with an engineer to find out any underlying problem.

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, suggesting a fault.

Issues with your thermostat.

If your thermostat isn’t working, 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 if you want 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 each 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 a new boiler. BOXT have a range of high-quality boilers to suit your needs. We can uninstall your old boiler and replace it with your new, more reliable model free of charge.

Here’s the 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.
  • 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 as well as the current position and 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 finish within the same day. If you have an older system or you’re completely changing the type of boiler, then the new installation may be longer.
  • 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, 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, meaning that 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. It’s good to know that BOXT have great prices for the exact same boiler you’d find elsewhere.

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 help with boiler replacement or need a boiler to suit a specific requirement, then BOXT are here for you.

Can I get help with replacing my boiler?

Yes! Here at BOXT, we’re committed to helping you find the most perfect boiler for your home and your needs by offering some of the best new boiler deals around. We’ve made finding a boiler incredibly easy by creating an online tool to find personalised recommendations for you.

Our ‘Find A Boiler’ tool is incredibly easy 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 more money in the process. Speak with an engineer today using our live chat option for advice and a new boiler quote.

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