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Best boiler brands

By Matthew Knight

Find out which boiler brand is the most reliable and which is likely to let you down during the cold months. We reveal if a Baxi will outlast a Worcester Bosch so you know if you're investing in a quality boiler brand. 

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In this article:

In our annual boiler survey, we ask more than 12,000 boiler owners about the boiler brand they own, how satisfied they are with it and whether their boiler has suffered any faults or breakdowns. 

We also ask almost 200 trusted boiler engineers from Which? Trusted Traders what they think of each manufacturer and how likely they are to recommend boilers from the brand. 

The results enable us to reveal the best boiler brands and the worst, based on our robust research. In this guide, we share what we've learnt about each of them.  

After you've chosen the best brand, make sure you read our guide to five things you need to know before you buy a new boiler.

Best boiler brands rated

We reveal the best gas and oil boiler brands. Below, we've collated the results of our annual boiler reliability survey and our annual boiler engineers' survey. 

You can use our results to discover which brands are the most reliable, have the highest customer score, the best build quality according to boiler engineers, and are the most likely to be recommended by boiler engineers who aren't incentivised to install boilers from that brand. 

There's a huge difference in overall score between the best boiler brands and the worst.

Which? members should log in now to unlock the scores in the table. If you're not already a member, try Which? to unlock our boiler research and all our online reviews.  

Gas boiler brands rated 

 
Brand Reliability Customer score Engineer recommendation Overall % score
86%
83%
80%
69%
68%
64%
60%
54%
54%
54%
n/a n/a
n/a n/a
50%
35%

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Oil boiler brands rated 

The table below reveals the oil boiler brands you can trust. Log in now or join Which? to unlock the tables results.

 
Brand Reliability Customer score Build quality Overall % score
Worcester Bosch
Grant

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Best boiler brands according to heating engineers 

We don't just rate boiler brands for reliability, and how satisfied the brands customers are, we also gather the views of almost 200 Which? Trusted Trader heating engineers. 

Log in now or join Which? to unlock the tables results, including ratings for build quality, the availability of parts and spares, ease of fixing a common fault, ease of servicing and engineer recommendation.

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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How the boiler scores are calculated 

In May 2018, we surveyed 12,191 boiler owners online to ask them about their boilers. 

  • The reliability score: This is based on whether people who own boilers up to six years old have ever had to have it repaired since they purchased it. The age of the boiler when the fault occured, and the total number of faults is taken into account. 
  • The customer satisfaction score: is based on how satisfied customers of each brand are with their boiler, and how likely they would be to recommend it to a friend.

The engineer scores are based on the views of almost 200 Which? Trusted Trader heating engineers who work with boilers every single day. We surveyed them in May 2018 and they told us their views on; 

  • Build quality.
  • Their likelihood to recommend the brand.
  • The availability of parts and spares.
  • How easy it is to fix a common fault.
  • How easy it is to service.

The overall brand score for each boiler brand is calculated by combining the reliability score, customer score and the engineers' scores. The results are weighted 40% for reliability, 30% for customer score and 30% for the engineers's scores.

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