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Best oil boiler brands

By Matthew Knight

We reveal the oil boiler brands you can trust. Once you know the best oil boiler brands, use our boiler reviews to choose the right one for you

Put us to the test

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 more than 12,000 boiler owners about the brand of boiler they own, how satisfied they are with it and whether their boiler has suffered any faults or breakdowns. We also asked 166 Which? Trusted Traders boiler engineers what they think of each manufacturer and how likely they are to recommend boilers from each brand. 

The results enable us to recommend the best and worst brands of oil boiler. This means you will be able to choose an oil boiler that won't let you down.

Best and worst oil boiler brands

Below, we've collated the results of our annual reliability survey and the results of our annual boiler engineers survey. You can see which brands are the most reliable, have the highest customer score and are the most likely to be recommended by boiler engineers who are not incentivised to install boilers from that brand. 

Which? members should log in now to unlock the scores in the table. If you're not already a Which? member, try Which? to unlock our oil boiler results and all of our online reviews, including our solar panel reviews and electric heater reviews.

Boiler brands rated
Best oil boiler brands
Brand Reliability Customer score Build quality Overall % score
Worcester Bosch


Member Content

Choosing the best oil boiler brand

In May 2018 we surveyed 12,191 people about their boilers. We asked them to tell us about any breakdowns, problems and annoyances with their boiler. This enables us to rate how reliable each brand is.

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). These two questions form the basis of the Which? customer satisfaction score.

As well as gathering the views of people who own each brand of boiler, we also collect the views of heating engineers who work with boilers every day. In May 2018 we asked 166 Which? Trusted Traders heating engineers about their views on boiler build quality and their likelihood to recommend a boiler brand to a customer. 


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