British Gas Boiler Guide

British Gas is the UK's largest energy supplier and it also installs boilers. British Gas only installs boilers made by either Worcester Bosch, Glow-worm, Viessmann or Vaillant.

These are four of the biggest brands in the UK, but how they score in our annual surveys for reliability, customer score and the views of heating engineers does vary. 

Take a look at our best boiler brands page to make sure you pick the best boiler brand possible from British Gas. 

More than 7,000 members of the general public take part in our annual boiler brand reliability and customer satisfaction survey, enabling us guide you to the best and worst boiler brands. We also conduct a survey with 153 trusted boiler engineers to get their independent views on which boiler brands are the best.

Which? verdict on British Gas boilers

British Gas installs boilers from a variety of manufacturers, including Worcester Bosch, Viessmann, Vaillant and Glow-worm. If you are thinking about buying a boiler through British Gas, you will be able to choose a boiler from any of these manufacturers. 

Before you decide which brand to choose, make sure you find out which is the most reliable, the best regarded by heating engineers and which is the favourite brand of those who actually own them. One of the brands above is significantly below the quality of the other three.

Which? members can log in to view what owners and engineers make of the biggest boiler manufacturers in the UK in our boiler reviews. Our survey of boiler owners and heating engineers covers all boiler manufacturers in the UK who have a market share greater than 1%. So if there is a boiler out there you are considering, then the chances are we can tell you lots about it if you join Which? today.

How much do British Gas boilers cost?

British Gas boilers are manufactured by a variety of brands, including Worcester Bosch, Viessmann, Vaillant and Glow-worm. They can cost anywhere between £600 and £2,600, depending on their size and type.

Choosing the best British Gas boiler

British Gas boiler warranties usually last for 12 to 24 months, although the length of the warranty will depend on which manufacturer developed the boiler for British Gas. New installations receive 12-month British Gas Homecare boiler repair cover.

British Gas offers boiler installations, maintenance and heating repair services, including one-off repairs and boiler cover contracts. 

British Gas contact details

Send your letters to:

British Gas

PO Box 4805

Worthing

BN11 9QW

You can contact British Gas by calling 0800 009 4450, or through the British Gas website.

British Gas technical support

0800 048 0505