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Gas Boiler Costs

Looking for an energy-efficient gas boiler? SpotDif makes it easy to compare gas boiler prices in your area.

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The SpotDif guide to gas boiler costs  

Are you looking to replace an old and inefficient gas boiler? SpotDif has everything you need to make a gas boiler price comparison. From a new boiler to professional installation, we aim to find you the best deals in your area. 


You might have seen reports that gas boilers will be 'banned' after 2025, and you may be wondering what that means for your home. Look closely, and you'll see that legislation only applies to new builds. This means millions of homes across the UK will continue to be heated by gas. 


So, how much do gas boilers cost? A new, super-efficient boiler starts at £500, rising to £2,500 for a top-of-the-range combi boiler that can handle all your heating and hot water needs. As for gas boiler installation, you’re looking at between £1,000 and £1,500.  These are ballpark figures so our guide is designed to look more closely at the cost of installing and servicing a new gas boiler. 

Read on for all you need to know and compare gas boiler prices from a range of top UK suppliers with SpotDif. In just a few clicks, you'll find the best deals in your area.

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What type of boiler do you have?

What is the average cost for a new gas boiler?  

So, what’s the average price for a new gas boiler? You can expect to pay between £500 and £3,500 depending on your boiler type: 

Combi boilers

For a combi boiler,  you’re looking at £500 to £2,500. These boilers produce heating and hot water on demand. It’s an ideal system if you have a smaller household or no place for a water tank. And with 90%+ efficiency, you’ll make savings on your existing bills. 

System boilers

A system boiler is likely to cost between £550 and £3,500. This boiler type works like a combi boiler to provide heat and hot water, using a separate tank for storage. This space-saving solution is a good fit for modern heating systems. 

Conventional boilers

The average cost for a conventional boiler is between £600 and £3,500. A conventional boiler has a hot water cylinder and cold water tank to meet the needs of larger families. It is often the best choice if you own an older property. 


Other factors affecting the cost of your gas boiler include: 


  • Property type, e.g. terraced or semi-detached 

  • Number of bedrooms 

  • Number of bathrooms 

  • Postcode and geographical location: For example, you can expect to pay more in London than in other parts of the country. 

  • Efficiency rating 

  • Boiler size 

  • Brand and features 

  • Length of warranty 

Can I still get a new gas boiler? 

The short answer is yes, you can. However,  the government's gas boiler upgrade scheme offers attractive incentives to switch to a sustainable low-carbon heating method. 


The bottom line is that gas boilers aren't going anywhere. So, investing in a new energy-efficient gas boiler upgrade could still be worth your while. With a lower unit price than electricity, gas is still the fuel of choice for most homeowners. Still, if environmental concerns are at the top of your list, look out for a combi boiler compatible with a solar thermal system. 


80% of homes in the UK currently use gas for central heating. In 2020, the government announced a gas boiler ban for new-build homes from 2025. The Heat and Buildings Strategy also proposed to stop new gas boilers being installed in pre-existing properties after 2035, causing consternation for homeowners. 


In actual fact, you won't be required to replace your old gas boiler with a low-carbon alternative in 2035. Instead, you'll be able to use your gas boiler until the end of its lifespan. Still, with generous gas boiler grants available to make the switch, it could be worth considering a heat pump or electric boiler instead if your boiler is due to be replaced.

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Let us take the hard work out of finding your new boiler; we find the best prices possible and match you with a local supplier.  

Gas boiler installation and labour costs  

If your boiler is 15+ years old, it could be time to upgrade to a new, energy-efficient model. The average gas boiler installation cost is £500 to £1,500, with additional labour costs between £200 to £500


For a like-for-like install, budget: 


  • £1,000 to £1,500 for a combi boiler 

  • £500 to £1,200 for a system boiler 

  • £500 to £1,100 for a conventional boiler 


Expect to pay between £1,500 and £3,000 for a new complete system install. 


Replacing an outdated back boiler with a combi boiler requires two days labour and the replacement of pipework and the gas flue. Expect to pay a minimum of £3,500 for installation and labour costs.  

Factors affecting gas boiler installation cost  

Boiler installations can be expensive as they must be completed by a gas-safe engineer. However, using a qualified professional is the only way to ensure that your installation meets specific safety standards for your peace of mind. 


Investing in a high-quality installation ensures the efficiency of your new boiler. In turn, this results in long-term savings on your energy bills. 


Other factors impacting gas boiler installation cost include: 


  • Boiler size and type 

  • The complexity of the installation, for example, replacing an older conventional boiler with a combi boiler 

  • Necessary upgrades to pipelines, flues and other systems 

  • The location of the installation, for example, if you’re moving the boiler or it's in a hard-to-access area 

  • Installation of smart thermostats and other energy-efficient controls

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Maintenance costs for a gas boiler

  • A Gas-safe engineer takes around thirty minutes to an hour and a half to check your boiler.  

  • A gas boiler service costs £130 to £150 on average. 


It's essential to have your boiler serviced annually. A qualified engineer will spot any issues, including gas leaks. Moreover, they'll fine-tune your boiler so it performs to maximum efficiency. 


An annual service is a comparatively small cost that could prevent significant problems further down the line. In addition, your boiler warranty may be invalid if you don't perform regular maintenance checks. A well-serviced boiler should achieve its expected lifespan, so you won't need to worry about replacement gas boiler costs. 

Gas boiler grants in the UK

There are currently no gas boiler grants to ease the cost of replacing a gas boiler. However, you could apply for the government’s gas boiler upgrade scheme to replace your fossil fuel boiler if it’s at the end of its lifespan. 


The Boiler Upgrade Scheme (BUS) offers £7,500 to qualifying households to replace an old gas boiler with a heat pump. To qualify, you must be: 

  • A homeowner, private tenant or landlord 

  • Have an EPC with no outstanding recommendations for insulation 

  • Be replacing a gas boiler or other fossil fuel-powered heating system 

Financial help is also available to upgrade your gas boiler to a more efficient model. Most manufacturers allow you to spread the cost of your new boiler with manageable monthly repayments. Replacing your boiler now could be worth it to save money on your bills in the future. 

Want to learn more about the BUS? Take a look at our guide to gas boiler grants.

Find the best gas boiler at a great price with SpotDif  

Gas is the most popular way to heat our homes. But is your boiler performing at maximum efficiency? If not, why not compare gas boiler prices at SpotDif? 


We'll help you navigate your options to get the best fit for your budget and household energy needs. We'll even seek out the best financing so you can spread the cost. With the best gas boiler prices and installation deals near you, you could soon save money on your heating bills. 


Finding a new gas boiler couldn’t be easier at SpotDif. Compare trusted providers and installers with us, and get ready for more efficient heating.


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Our mission is to find you the best price possible and match you with a local accredited installer, taking the hard work out of a new boiler.
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Anna Dearden
Home Sector Specialist
Combining in-depth research with an interest in all things home improvement, I aim to keep SpotDif readers up to date with interior design trends, renewable energy options, and more.
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