Best and worst gas boiler brands


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So you’ve taken the decision to invest in a new boiler. In doing so you’ll reduce energy bills significantly, especially if your old system is inefficient. But which boiler brand should you look towards?

Fortunately consumer watchdog Which? have drawn up a list of the best and worst rated boiler manufacturers, as given by customers.

As you’ll see, there’s quite some difference between the best and worst, with the top companies receiving scores of 84% and the worst just 44%. Two of the national brands stand out for being better than average, so take a look at the customer satisfaction table below:


According to this table, the average customer score given by Which? consumers is 74%. In total there were 5,046 responses to the survey. Respondents for each brand were as follows: 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

Which? also carried out a reliability score for boiler manufacturers in the UK. Scores were based on the number of boilers needing repairs.

See the reliability table below:


Again, the average reliability score is 74%, with a total of 3,846 responses.

How are brand customer scores calculated?

Which? completed their research in June 2013, asking about gas and oil boilers which have been fitted in the UK since 2005. As part of the survey, Which? members were questioned on breakdowns, problems and any issues that had risen over the years.

The customers were then assessed for satisfaction and how likely they would be to recommend the same brand in the future. Both of these questions form a considerable proportion of the final score.


Facts & Figures You’ll Love To Share

  • Heating accounts for around 60% of the annual household bill and a new boiler can slash expenses.
  • By replacing your old and inefficient boiler you can save up to £310 a year according to the Energy Saving Trust.
  • Energy prices have doubled since 2004 and will double again by 2020, so secure your energy future with an A-rated boiler.
  • An annual boiler service costs between £50 and £100 but could save you hundreds of pounds on future repair work.
  • With a new boiler you can slash carbon dioxide emissions by a whopping 1,200kg each year.

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Tom Crosswell

I have been managing online projects since 1999 and I'm a experienced marketeer, who is well versed in international brand management, online business strategy and developing long term relationships. Through my academic and professional background I am a specialist in generating online loyalty towards brands. My experience has taught me that ultimately business is about relationships and people. For more information see my Google+ page.