How Much Does A New Boiler Cost?

A new boiler will cost anywhere between £500 and £2,500.

Installing a new boiler will save you up to £350 per year on your energy bills.

Your old boiler could have an efficiency as low as 50%. This means that your boiler is stealing 50p for every £1 you spend on fuel!

You can compare prices of leading boiler installers in your area by completing the form above.


In this Guide:



How Much will a New Boiler Cost?

The cost of installing a new replacement boiler will depend on the size and type of boiler you require, and the installation company you use.

Generally, new boilers cost around £500 - £2,500. The table below shows the typical prices of leading boiler brands.

Boiler Brand
Typical Cost of a New Combi Boiler
Typical Cost of a New Conventional Boiler
Worcester Bosch
£875 - £2,615
£725 - £2,405
Vaillant
£855 - £1,480
£780 - £1,390
Baxi
£685 - £1,730
£750 - £1,430
Glow-worm
£660 - £1,455
£840 - £1,550
Potterton
£610 - £1,300
£575 - £2,640

Installation costs can be just as high, also running from around £500 - £1,500 depending on the circumstances.

Conventional boilers usually have higher installation costs due to the pipework involved in fitting them.

Overall you should look to budget around £1,200 - £3,000 to replace your old boiler completely.

All the brands in the table above feature in our best boiler guide.



How Much do Combi Boilers Cost?

Combi boilers are ideal for smaller homes with one or two bathrooms. Combi boilers are compact and provide both the heating and hot water directly from the boiler itself.

The table below shows typical prices for various sized combi boiler installations. These prices are based on a customer replacing their combi boiler, with a like for like system, in the same place as the original.

Company
Boiler Type
Boiler Size
Boiler Model
Typical cost incl. installation
Baxi
Combi
24kW
Duo-tec 24 HE A
£1,410.00
Vaillant
Combi
24kW
ecoTEC plus 824
£1,779.60
Glow-worm
Combi
28kW
Betacom 28a
£1,450.80
Worcester Bosch
Combi
28kW
Greenstar 28i Junior
£1,671.60
Ideal Boilers
Combi
32kW
Vogue 32
£1,796.40
Vaillant
Combi
32kW
ecoTEC exclusive 832
£2,181.60
Ideal Boilers
Combi
35kW
Logic 35
£1,558.80
Baxi
Combi
40kW
Duo-tec 40 HE A
£1,644.00

Based on South East England, with no additional radiators, fittings, thermostats or powerflushing existing radiators. Correct at time of publishing, to be used as a guideline only.

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How Much do Conventional Boilers Cost?

Conventional boilers are best suited for homes with more than one bathroom and a water tank.

The table below shows typical prices for various sized conventional boiler installations. These prices are based on a customer replacing their conventional boiler, with a like for like system, in the same place as the original.

Company
Boiler Type
Boiler Size
Boiler Model
Typical cost incl. installation
Ideal Boilers
Conventional
15kW
Mexico HE 15
£1,659.60
Baxi
Conventional
15kW
Solo 15 HE A
£1,377.60
Worcester Bosch
Conventional
18kW
Greenstar 18Ri
£1,528.80
Baxi
Conventional
18kW
EcoBlue Advance 18 Heat
£1,628.40
Glow-worm
Conventional
24kW
Flexicom 24hx
£1,476.00
Ideal Boilers
Conventional
24kW
Mexico HE 24
£2,094.00
Baxi
Conventional
30kW
Solo 30 HE A
£1,519.20
Worcester Bosch
Conventional
30kW
Greenstar FS 30CDi Regular
£2,170.80
Glow-worm
Conventional
38kW
Flexicom 38hx
£1,822.80
Vaillant
Conventional
38kW
ecoTech plus 438
£2,131.20

Based on South East England, with no additional radiators, fittings, thermostats or powerflushing existing radiators. Correct at time of publishing, to be used as a guideline only.



Could You Save With A New Boiler?

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How Much does Boiler Installation Cost?

Boiler Installation Cost

The cost of installing a new or replacement boiler can be just as much as the boiler itself.

Only a trained professional should replace your boiler which means you will need a Gas Safe registered installer. The Gas Safe register has replaced the CORGI register.

The table below shows typical installation costs and the total cost including the boiler.

Type of job
Boiler Installation Cost
Boiler Cost
Total Cost
Replacing gas condensing combi boiler
£610 - £725
£660 - £1,455
£1,270 - £2,180
Replacing a gas non-condensing boiler with a condensing boiler
£660 - £845
£660 - £1,455
£1,320 - £2,300

Whilst a new boiler can cost between £500 and £2,500, most households pay nearly double that due to installation costs. Installation costs are high because boiler fitting requires a qualified professional due to the nature of the work involving gas pipes.

The replacement costs will often include disposing of your old boiler. The price for replacement will vary depending on how much technical work is needed to fit your new boiler. Charges will be higher if the installer has to remove/install pipe work and/or new radiators.

Whether you are replacing a conventional boiler with a similar system or changing to a combi system will also make a difference.

Additional costs to be aware of when budgeting for your installation:

  • Changing from one style boiler to another (eg. conventional to combination)
  • Moving the placement of the boiler
  • Removal of old units, especially old conventional water tanks
  • Adding or replacing radiators
  • Powerflushing existing radiators
  • Adding compulsory temperature control valves to radiators
  • Thermostats and programmers

It is unlikely that you will need ALL of these additional extras. Some may be already included in installation quotes and others may be unnecessary for your situation.

You can learn more about boiler replacement on the Energy Saving Trust’s website.

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Can you Pay Monthly for your New Boiler?

Due to the high initial cost of replacing a boiler, most boiler companies offer finance schemes. This allows you to spread the cost of your new boiler over a number of years, making monthly payments with no upfront costs.

Alternatively, you can also rent a boiler. The advantage of renting a boiler is you know exactly how much you will have to pay for your boiler each month. If anything goes wrong with the boiler you will not have to pay for repairs as this is the responsibility of the company renting you the boiler.

However you will be tied into a lengthy contract and at the end of the contract your repayments are likely to be more than the upfront cost of installing a boiler. For example, Hassle Free Boilers offer a rent a boiler scheme for £36.99 a month, but you will be tied into a 12 year contract.

Read our guide to boiler finance



How Much will you Save? What will be your Return on Investment?

Installing a new boiler can save a detached house up to £570 a year while a semi-detached home will save around £350 per year.

If you exchange your old boiler for a new more energy efficient boiler you will almost certainly see a saving on your energy bills straight away.

Type of Property
Typical cost of boiler and installation
Energy bill savings
Time to return on investment
Return on investment after 10 years
Detached house
£3,020
£570
5.2 years
£2,680
Semi detached house
£2,632
£350
7.7 years
£768
Detached bungalow
£2,320
£290
8.0 years
£580
Mid terrace house
£2,320
£280
8.3 years
£480
Mid floor flat
£2,112
£145
14.6 years
-£967

*These figures are based on replacing a G-rated condensing boiler with a new A-rated condensing boiler. Energy bill savings taken from Energy Saving Trust.

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Should you Opt for the Cheapest Boiler?

A lot of the brands mentioned on this page are of a high quality. There are cheaper boilers available, especially online and without installation. However, ensuring that the boiler is safe and safely installed is of paramount importance.

Boilers are an investment to the future energy efficiency of your home. A badly manufactured or installed boiler could end up costing you a lot more in the future. Boilers can also be very dangerous if mis-handled so it is important that they are fitted by a Gas Safe installer (Gas Safe has replaced Corgi registration).

One way to safely save money on your boiler is by visiting a smaller, local installation company. Smaller companies often do not have to pay as much tax and can therefore offer better deals to their customers.

Fill in the form at the top of the page to receive quotes from both national and local installers, and start comparing prices today.

If you are worried about the upfront costs of installing a new boiler you can visit our free boiler grants page here. You can also read our guide to cheap boilers.

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Is Now the Right Time for you to Get a New Boiler?

Follow our tips and it will help you concretely decide if now is the right time for you to invest:


Is your boiler beyond the point of cost-efficient repair?
If you've had a qualified engineer take a look at your boiler and they’ve told you as much, then you know the time is ripe for a replacement.

Is your boiler giving you control over your heating?
It will help you cut your heating bills if you have a flexible timer or controls, as well as a thermostat. So if you don’t have these, it’s worth considering (but you may only need new controls installing).

Does your system have a dry cycle?
This is found on older boilers, which don’t switch off when an optimum house temperature is reached, but rather send the heat to an ‘overflow radiator’. This can waste a lot of energy, so can be a big incentive for a replacement boiler.

Does your boiler have a continuous pilot light?
Again, this wastes a lot of gas, so consider a change.

Is your boiler on the floor?
It’s probably older and less energy-efficient than new boilers, making a replacement a worthy job.

Is your boiler G-rated?
Once again, for energy efficiency, consider a replacement.

Want to sell your new house?
Getting a new boiler could add to its value.


If you can’t justify the costs, and your boiler isn’t beyond repair, there are still a number of different steps you could try to cut your heating costs.

  • Have your boiler serviced yearly to ensure it is working properly.
  • Insulate your walls and loft.
  • Draught-proof your home and insulate your windows.
  • Consider new heating controls such as a new timer, radiators or a new thermostat.
  • Switch your gas and electricity supplier to ensure you are getting the best deal for you.

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What Next?

Always get a qualified engineer to assess your boiler if you are having issues with it. The engineer will be able to tell you if the boiler can be repaired or if it needs replacing completely. Most boilers over 15 years old will need replacing soon.

Once you have your new boiler installed, we strongly recommend ensuring you have an annual boiler service to keep your boiler running smoothly.

You can compare boiler and installation prices from local installers by completing the form at the top of this page.


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