Boiler brands rated Best and worst gas boiler brands
To help you choose a new boiler, we got the lowdown on popular condensing boiler brands by asking 10,358 owners – all Which? members – about their experiences of owning their boilers.
Best and worst gas boiler satisfaction scores
There's a big difference between the best customer satisfaction score and the worst; the top-rated boiler manufacturer has a customer satisfaction score of 84%, while the worst gets only 28%.
Two brands stand out for having the highest customer satisfaction scores and one is worse than average.
|Gas boilers Which? customer score|
The average Which? customer score is 74%, based on 5,048 responses.
Respondents for each brand are: Alpha (73); Ariston (32); Baxi (361); British Gas (231); Ferroli (43); Glow-worm (446); Ideal (312); Halstead (43); Main (40); Potterton (291); Remeha (39); Vaillant (903); Viessmann (103); Worcester (1,911)
Gas boiler reliability
The Which? reliability score is based on the proportion of boilers that have had repairs, adjusted by age to ensure that all brands are compared on an equal basis.
We need at least 50 responses per brand to calculate a reliability score.
|Gas boilers Which? reliability index|
The average brand reliability score is 74%, based on 3,846 responses. Respondents for each brand are: Baxi (278); British Gas (182); Glow-worm (332); Ideal (206); Potterton (187); Vaillant (779); Worcester (1,580).
How we calculate boiler brand customer scores
In June 2013, we asked about the gas and oil boilers Which? connect online panel members had installed since April 2005.
We asked Which? members about their brand of gas or oil condensing boiler, and to tell us about breakdowns, problems and annoyances with their gas boiler.
We also asked them to assess how satisfied they were, and how likely they would be to recommend their brand of gas condensing boiler (regardless of their experience of getting the boiler installed). These two questions form the basis of the Which? customer satisfaction score.