Boiler cost calculator

Sorry We need you to look at the following areas of the form again.

We're missing or don't recognise some information in:

Use our boiler cost calculator to find out the estimated cost of installing a new boiler or central heating system in your home.

Or, for a no-obligation, fixed price quote specific to your home, book an appointment with an expert Heating Adviser.


Do you have gas central heating at your property?


Do you want to have new radiators installed?

Current boiler

Do you currently have a Conventional or Combi boiler? (Boiler types explained)

New Boiler

What type of new boiler would you like? (Boiler types explained)


Your estimate (based on the information you provided)

Book an appointment with your local Heating Adviser and they will visit your property for free to assess your specific heating needs and provide a no-obligation quote. They'll talk you through your options and give you advice on how you could improve the energy-efficiency of your property.

British Gas New Heating Limited is authorised and regulated by the Financial Conduct Authority for its consumer credit activities.

[1] Offer closes 28th February 2015, excludes warm air units and the simplicity boiler range and is available for domestic properties only. Offer will only be applied at point of sale and is subject to boiler installation by British Gas. Cannot be used in conjunction with any other British Gas boiler offer.

[2] Availability of credit is subject to status, affordability assessment and credit checks.

[3] Based on comparing the savings for upgrading a G-rated to an A-rated condensing boiler with a full set of heating controls. Saving figure is illustrative and based on a gas-heated 3 bedroom semi-detached house. Savings assume a gas price of 4.21p/kWh. Source: (07/14).

Conventional boilers take up more space, because you need two tanks: one to store cold water in your loft and another in your airing cupboard to supply hot water. They take a little longer to heat up but are ideal for families or large houses where more than one hot tap will be in use at the same time.

Combi or combination boilers are ideal if you want to maximise space, because they do not need a separate hot water tank or cold water storage tank. They heat up water when you need it but if you often run several taps at once, you may find your hot water flow isn’t as powerful as with a conventional boiler.

The boiler and heating system you need will depend on the type of property you live in and how many people live there.

We cannot provide an online estimate for a Combi to Conventional boiler conversion. Please call us on 0800 327 7475 to book an appointment with your local Heating Adviser.

Payment options to suit you

Pay in full

You can pay for your boiler in full with major debit and credit cards or by cheque.

Once you agree to an installation, we’ll usually take a 10% deposit. The full amount is only paid once your new boiler is up and running.


Pay monthly

As a credit broker, we can arrange a finance agreement through Barclays Partner Finance, meaning you can choose to spread the cost of your new boiler over three to ten years.^

  • 14.9% representative APR.
  • No upfront deposit required.
  • Make additional payments at any time.

A representative example of a payment plan

† The rate of interest is variable downwards only. It cannot go up.

Reasons to choose British Gas

We guarantee a fixed price

When our Heating Advisors quotes a price, we guarantee it won’t increase even if there’s unexpected work to do.

Boiler cost calculator

Pay monthly with no upfront deposit

We could help you spread the cost over 3-10 years or you could choose to pay in full if you’d prefer.

Payment options

Your home is clean and safe

Our Engineers leave your home neat and tidy and will arrange the safe disposal of all waste.

Step by step guide

Free aftercare included

This includes service and repairs for your boiler, controls and central heating system for one year.

Latest offers

British Gas New Heating Limited is authorised and regulated by the Financial Conduct Authority for its consumer credit activities.

^ Availability of credit is subject to status, affordability assessment and credit checks.

* Based on 546 customer responses collected between 09/12/14 & 12/12/14.

We value the honest feedback of our customers, so we've partnered with Reevoo - an independent reviews service. Reevoo collects ratings and reviews from people who shop with us. Using a third party ensures there is no bias, editing or fake reviews.

British Gas Boiler Installation Service reviews verified by Reevoo

Quality of the installation
Quality of advice provided by the Heating Adviser (person who gave you your quote)
Overall rating
Scores 8.8 out of 10 based on 1437 reviews
8 out of 10


Dorset GB
In general fast and efficient with full explanations.
Published on: 27 January 2015
10 out of 10


Kings Langley, Herts GB
First class service, very well explained and demonstrated. Also Hive is a real boon, if I'm heading home at a different time to normal the house can be at the right temperature and I can reduce heat when I'm not needing it.
Published on: 26 January 2015
9 out of 10


Richmond GB
We were very satisfied with a job well done.
Published on: 26 January 2015
5 out of 10


crook GB
The boiler installation was fine apart from a leak to the waste pipe. The electrician was not very good as he left a live wire under bedroom floor which subsequently gave an electric shock to a friend when putting floor boards back down. Also 2 electric sockets were disconnected when fitting earth cable to switch board. The above were fixed subsequently within 3 weeks. The heating adviser needs to know more about fitting boilers as he told me it could take up to a day and it took 2 days. Overall the boiler is working fine now if it was expensive.
Published on: 26 January 2015
8 out of 10


Boiler installation was fine, the chaps had real attention to detail and security. Very good.
Published on: 26 January 2015
7 out of 10


Walton on Thames GB
Basically very happy with the adsvice and installation
Published on: 26 January 2015