Boiler reliability

Boilers

Boiler reliability

by Matthew Knight

Find out which is the most reliable boiler brand, or if a Glow-worm boiler will outlast a Baxi. Then pick a reliable boiler using our boiler reviews

Find your perfect Boiler

Our Test Labs compare features and prices on a range of products. Try Which? for £1 to unlock our reviews. You'll instantly be able to compare our test scores, so you can make sure you don't get stuck with a Don't Buy.

  • Get the Which? verdict from our independent experts
  • Weigh up the pros and cons in an instant
  • Go to town on the details with our full review
  • Read our member reviews to see what they think
  • Is it a Don’t Buy? It could be a dud, and a costly one too
  • Best Buy
    55
  • Don't Buy
    0
  • 370 Boilers available

We asked more than 10,000 boiler owners about the brand of boiler they own so that we can tell you which are the best and worst boiler brands.

Our unique research enables us to tell you which brands are the most reliable, and which are likely to let you down during the cold winter months.

To find out which brands are best and worst for reliability, Which? members can log in to unlock the table below. Not yet a member? Take out a one-month trial for £1 and get instant access to our boiler reliability results and all of the reviews on our website.

Boiler faults

In our survey we found that problems with boilers are common - 25% of owners with boilers bought since 2006 have experienced faults with their gas or oil condensing boilers. Not all faults require a boiler repair, but three in 10 members have had a visit from the boiler engineer.

A boiler losing pressure or water leakage are the most frequent problems, having respectively affected 9% and 5% of people. 

Gas boiler brands rated for reliability
Gas boiler reliability table
BrandReliability rating
Alpha
Baxi
British Gas
Glow Worm
Ideal
Potterton
Vaillant
Viessman
Worcester Bosch
Table notes
1 The reliability score is based on responses from a survey of 10,779 members of Which? Connect about their boilers that took place in May 2015.

Key

Member Content
Oil boiler reliability
Oil boiler brands rated for reliability
BrandReliability rating
Grant
Worcester Bosch

Table notes
1 The reliability score is based on responses from a survey of 10,779 members of Which? Connect about their boilers that took place in May 2015.

Key

Member Content

Our research

In May 2015 we surveyed 10,779 Which? members online about the problems they had experienced with their main gas or oil central heating boiler. The reliability score is based on whether people who own boilers up to six years old have ever had to have their main boiler repaired since they bought or acquired it.