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Boiler brands rated by heating engineers

By Matthew Knight

We reveal the best boiler brands according to trusted heating engineers. Once you know the best brands, pick a new boiler using our boiler reviews.

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Our Test Labs compare features and prices on a range of products. Try Which? 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.

We asked 166 Which? Trusted Trader heating engineers about the different brands of boilers they work on. The results enable us to give you a unique insight into how likely engineers are to recommend each brand of boiler and whether they are well built. 

We also asked if they can quickly get hold of parts and spares, and how easy it is to fix a common fault. The more difficult it is, the more likely you are to get hit with a higher repair bill.  

Keep reading to find out which boiler brands our trusted heating engineers recommend. 

Don't buy a new boiler without taking a look at our Best boiler brands.

Best and worst boiler brands

We used Which? Trusted Trader engineers - all our Which? trusted traders go through a rigorous vetting procedure to confirm the expertise and quality of their work.

When we asked our engineers about their boiler recommendations, we only included responses for brands they are not accredited to install. This was to remove any potential bias - which means you can trust our results.

It's a ringing endorsement of the quality of the brands that are rated highly, as even engineers who are not incentivised to install them are very likely to recommend them. 

As you can see from our table, below, there's a big difference between the top and bottom boiler brands.

Which? members should log in now to unlock the scores in the table below and reveal the recommended brands. If you're yet to become a Which? member, try Which? and discover the benefits of having thousands of product test results at your fingertips. 

Boiler brands rated
Best boiler brands according to heating engineers
Brand Availability of parts Fixing a common fault Build quality Build quality Engineer recommendation

Table notes
Engineer recommendation, build quality, availability of parts and spares and ease of fixing a common fault, quality of technical service and recommendation are based on responses to a survey of 166 Which? Trusted Trader heating engineers that took place in May 2018.


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Choosing the best boiler brand


As well as our survey of heating engineers, we also surveyed 12,191 boiler owners (May 2018). We asked them to tell us about any breakdowns, problems and annoyances with their boiler. This enabled us to determine the reliability rating of each brand - which you can use to choose a boiler that won't let you down.

We also asked them to assess how satisfied they were, and how likely they would be to recommend their brand of boiler (regardless of their experience of getting the boiler installed). We combine this data with our heating engineers' survey to give an overall score for all the boiler brands in our survey.

To find out which are the best and worst boiler brands according to people who own them, and heating engineers, see the best boiler brands


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