How much is a boiler replacement? 

Researching the cost of a new boiler is a luxury only afforded to those who plan ahead. If your boiler breaks suddenly, the chances are you’ll opt for whatever’s available at the time so you can switch your heating back on! 

If your boiler is still hanging on by a thread or is over ten years old, don’t wait too long to start your research. Read on to learn the cost of a boiler installation.  

New boiler costs  

New boilers cost between £600 and £2500. This range covers everything from supply-only economy boilers to premium system boilers at the top end of the scale (£1.3k+). 

The price you’ll pay depends on three things: 

  • Type of boiler, e.g. combi boiler, system boiler, regular boiler 
  • Size of the boiler 
  • Make and model (Worcester Bosch, Ideal, Valiant, etc.) 

We’ve put together this table of average boiler prices to give you an idea of costs.  

Combi boiler (£)System boiler (£)
These prices exclude VAT

These figures are for the boiler only; you’ll also need to add labour and any extras, such as smart controls, radiators and any additional pipework or parts you might need.  

How much to replace a boiler (UK) 

The cost of fitting a new boiler varies by location because of the difference in hourly labour rates. A boiler replacement will likely cost more in London than in the North East. 

According to The Energy Saving Trust, a straightforward boiler replacement (swapping like for like) costs around £3,700.

You can expect to pay more for complex jobs that are likely to take longer, such as: 

  • Switching from one type of boiler to another, e.g., a system boiler to a combi boiler
  • Increasing the size of your boiler to accommodate an extension/conversion 
  • Moving the boiler’s location
  • Upgrading from an economy to a premium model 

The work will likely take longer in all these cases, so you can expect to pay more for labour. You might also need extra parts (pipework, valves, pumps, etc.). 

If you’ve extended your home and need a bigger boiler to heat more rooms, you should also budget for extra radiators. 

Smart controls are another optional extra that you can request alongside your boiler installation. You can expect to pay between £100 and £250 for a smart thermostat and £35 to £80 per smart radiator valve.

Action button - arrange your free survey for a new boiler today

Paying for your new boiler – your options  

The best way to pay for a boiler installation is in one lump sum, but this isn’t the kind of cash you’ll find down the back of your sofa. If your boiler needs replacing in the coming years, start saving now! 

You also have the option of taking out boiler finance to cover the cost. These plans allow you to spread the cost of your new boiler over a fixed term, so you don’t have the hassle of finding the money upfront. 

Instead, you can make affordable, planned payments every month. Here’s an illustration of how that might look:  

Boiler finance illustration

Boiler installation cost: £5,000 
Deposit: £500 
Loan amount: £4,500

Monthly instalments: £187.50 over 24 months, interest free 

There are lots of deals available with varying terms, so you should be able to find one that suits your circumstances. We’ve partnered with Novuna Personal Finance to offer interest-free payment plans on new boiler installations.  

How to save money on the cost of a new boiler 

The first thing to know about buying a new boiler is that you don’t have to buy it from your energy provider. Boiler installations from big brands like British Gas will likely cost more than your local heating company. 

Follow these top tips to bag yourself the best deal on your new boiler: 

  • Ensure you always get three quotes. This is the best way to gauge a sensible quote for your circumstances.  
  • Consider quotes from Gas Safe registered engineers only.  
  • Ask for someone to come out and assess the job before they commit to an estimate. Without seeing the size and scope of the project, you can’t be assured you’re getting an accurate quote. 
  • If the estimate isn’t itemised, don’t be afraid to ask how the engineer arrived at that figure. 
  • If you want to add extras like smart heating controls, make sure you mention it at the start of the project. It might cost you more if you decide to add it later. 

Finally, before you choose a heating company, check out its reviews online. Find out what its customers really thought about the work.

Is it worth buying a new boiler? 

Your boiler may still be working, but how much longer can you rely on it? If it’s over ten years old, it’s unlikely to last much longer. Worse still, older boilers are inefficient and expensive to run. 

Unsurprisingly, old boilers use more fuel, which is bad news for your bank balance and the environment. 

Switching from a G-rated boiler to an A-rated condensing boiler with a programmer, room thermostat, and thermostatic radiator valves (TRV) could save you £385 on your fuel bill over the year*. 

This illustration from the Energy Saving Trust is based on a semi-detached house (the full set of figures is available on the EST website). 

New boiler costs – your FAQs

Find the answers to your frequently asked questions on new boiler costs in this section.

How much is a boiler replacement? 

The cost of a new boiler (UK) is between £600 and £2,500 depending on the size, type and brand of boiler you get. But this is just one part of the price you’ll pay for a boiler replacement. 

You also need to factor in labour, additional parts (if you’re moving your boiler) and extras like smart controls or a magnetic boiler filter. 

How much is a Worcester boiler? 

You can expect to pay between £800 and £2,900 for a Worcester Bosch boiler. The cost varies according to the size and type of boiler you require. 

This is for supply only; you should also factor in installation costs. 

Arton Heating is an accredited Worcester Bosch fitterget a quote today

Do I need a power flush with my new boiler? 

Whether or not you need a power flush with your new boiler installation depends on various factors, including the condition of your existing heating system and the recommendations of your installer.

It’s not mandatory, but it’s often recommended in situations where debris or sludge is already present in the heating system. 

Can I buy a new gas boiler after 2025? 

You may have heard that new gas boiler installations are banned. The bottom line is that after 2035, you won’t be able to buy a new gas boiler in the UK. 

However, the government has made it clear that no one will be asked to replace their existing system, so if you buy a new gas boiler now, you can keep it until the end of its life. 

Read more about the gas boiler ban.

*Based on October 2023 fuel prices.

Post author

Daniel Arter

Date of post

February 7, 2024


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