We use cookies to allow us and selected partners to improve your experience and our advertising. By continuing to browse you consent to our use of cookies. You can understand more and change your cookies preferences here.

Coronavirus Read our latest advice
Reviews based on facts
Our rigorous tests find the facts, and our impartial reviews tell you the truth about how products perform. First month £5, then £9.99 per month, cancel anytime.
Try Which?
6 October 2020

Best oil boiler brands

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
Woman relaxing next to radiator
Matthew Knight


In May and June 2020 we asked more than 7,500 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 153 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.

 

Brand Reliability Customer score Availability of parts and spares Overall % score
Best oil boiler brands
Boiler brands rated
Firebird
Member icon
Member icon
Member icon
Member icon
Grant
Member icon
Member icon
Member icon
Member icon
Worcester Bosch
Member icon
Member icon
Member icon
Member icon
Warmflow
Member icon
Member icon
Member icon
Member icon

See our Worcester Bosch boiler reviews and Grant boiler reviews.

Choosing the best oil boiler brand

In May and June 2020 we surveyed 7,500 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 June 2020 we asked almost 153 Which? Trusted Traders heating engineers about their views on the availability of parts and spares and how easy each brands boilers are to fix and service.