We'll pay the VAT. 20% OFF the cost of a new boiler. Offer ends 30th April 2015. Find out more

Boiler cost calculator

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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] This offer is valid until 30th April 2015 and is available for domestic properties only. It excludes warm air units and the simplicity boiler range. We will take 20% off your new boiler at the point of sale, on the basis that we install the boiler. You can't use this offer with another British Gas offer unless the other offer states that it's ok.

[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: http://www.energysavingtrust.org.uk/Heating-and-hot-water/Replacing-your-boiler (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

Fixed price quote

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

No deposit

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 left clean and safe

Your home is left 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

Aftercare included

This offer includes HomeCare 200™ which provides service and repair 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.

* 91% recommendation rating is based on 1,463 customer responses collected between 09/12/2014 & 02/02/2015.

91% of customers recommend British Gas boiler installations*. See below for more detail on how they rate it. Reevoo

British Gas Boiler Installation Service reviews verified by Reevoo

Quality of installation
Advice from Heating Adviser
Overall rating
Scores 8.8 out of 10 based on 2294 reviews
10 out of 10


very pleasant sales rep and free efficient fitters
Published on: 28 February 2015
8 out of 10


Very good service, friendly people only concern is people with similar boilers say mine is much noisier than theirs firing up.
Published on: 28 February 2015
9 out of 10


Friendly & helpful staff kept us informed on what they were doing at all times even provided a heater whilst working on removing the boiler in sitting room would definitely be using again
Published on: 28 February 2015
9 out of 10


A highly professional job was done by everyone.
Published on: 28 February 2015
10 out of 10


Hemel Hempstead
My boiler broke down just before Christmas and the new one was installed, as promised, on the date arranged. Every person I dealt with was professional and friendly. All parts were ordered correctly, and delivered on time. The installation engineer was excellent, and the whole day was problem free. Even down to the electrician who arrived to sign off his part, and the man who picked up the scrap parts, I was surprised how well organised the day was.
Published on: 28 February 2015
10 out of 10


Brilliant clean and tidy worker got on with the job. No problems boiler working perfectly. Just waiting to see how cost effective this new boiler will be.
Published on: 28 February 2015