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1 October 2020

Which boiler brand to buy in 2020

According to our survey, almost eight in ten boilers from the least reliable brand require an expensive repair in the first six years. From a reliable brand that figure drops to less than two in ten. Pick a reliable boiler using our boiler reviews
Thermostat being altered
Matthew Knight

We asked 7,500 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 shows you which brands are the most reliable, and which are likely to let you down during the cold winter months. 

In our survey we found that problems with boilers are common: four in ten boilers purchased in the last six years have already needed at least one repair, but that drops to just two in ten for the most reliable brands. At the other end of the scale, more than half of the boilers from the least reliable brands have needed at least one repair. 

The best way to avoid potential boiler problems is to buy a boiler from a reliable brand. Alongside that, make sure you get your boiler serviced annually.

The most reliable gas boiler brands

Our table below reveals the reliability of the gas boiler brands that are available to buy in the UK. All the major brands of gas condensing boilers are covered.

There's a big difference between the most and least reliable brands. The least reliable brands are almost four times as likely to break in the first six years of use compared with the most reliable brands in our survey.

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? Try Which? and get instant access to our boiler reliability results and all of the reviews on our website.

Gas boiler brands rated for reliability
Gas boiler reliability table
Brand Reliability rating
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*****
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*****
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****
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****
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****
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****
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***
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***
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***
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***
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***
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*

The most reliable oil boiler brands

Our survey revealed reliability data for four major oil boiler brands, Worcester, Grant, Firebird and Warmflow. Other brands are owned by too few members for us to report statistically robust results.

 

Oil boiler brands rated for reliability
 
Brand Reliability rating
Grant
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Firebird
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Worcester Bosch
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Warmflow
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Our research

In May and June 2020 we surveyed 7,500 members of the general public 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.