Boiler reviews: Owners' views

89%the customer score of the top rated boiler brand

Best brands of boilers

Every year we survey thousands of Which? members about their home appliances to find out which brands they're happiest with. This year, we've compiled the views of more than 10,000 Which? members to show you the boiler brands which have left owners the most - and least - satisfied.

Our table below reveals customer satisfaction scores for a host of brands - covering those owned by more than 90% of the Which? members in our survey. Brands of gas boiler rated below include Vaillant, Baxi, Worcester and Viessman.

The most approved brand of gas boiler achieves a customer score of 89%, while the least pleasing brand scores just 61%. 

Which? members can log in to find out which two brands come top in the table below. If you're not already a member, you can sign up for a £1 trial to try full Which? access instantly.

Gas boilers Which? customer score
BoilerScore
AlphaSubscriber only content
BaxiSubscriber only content
British GasSubscriber only content
Glow WormSubscriber only content
IdealSubscriber only content
Johnson & StarleySubscriber only content
MainSubscriber only content
PottertonSubscriber only content
Rehema AvantaSubscriber only content
VaillantSubscriber only content
ViessmannSubscriber only content
VokeraSubscriber only content
WorcesterSubscriber only content

Table notes:
The average customer score is 80%, based on responses from 4,354 condensing gas boiler owners who have bought a boiler since April 2006.
Responses for each brand are: Alpha (87); Baxi (267); British Gas (178); ; Glow-worm (327); Ideal (195); Johnson & Starley (31); Main (45); Potterton (172); Rehema Avanta (32); Vaillant (847), Viessman (130); Vokera (55); Worcester (1,844).

Table notes

The average customer score is 74%, based on responses from 5,048 condensing gas boiler owners who have bought a boiler since April 2005.

Responses for each brand are: Alpha (73); Ariston (32); Baxi (361); British Gas (231); Ferroli (43); Glow-worm (446); Halstead (43); Ideal (312); Potterton (291); Vaillant (903), Viessman (103); Worcester (1,911).

Best brands of oil boilers

Our customer score table reveals their satisfaction with the brands of oil boiler owned by 75% of the Which? members in our survey. 

Which? members can log in to find how the brands compare in the table below. If you're not already a member, you can sign up to try out full access for one month, for just £1.

Oil boilers Which? customer score
BoilerRatingScore
GrantSubscriber only contentSubscriber only content
WorcesterSubscriber only contentSubscriber only content

Table notes:
The average customer score is 76% based on 369 responses from owners of oil boilers bought since April 2006.
Sample sizes are: Grant (145); Worcester (127).

Our research

In June 2014 we surveyed 10,119 Which? Connect online panel members about their main gas or oil central-heating boiler. 

The Which? customer score shown in the table is a combination of owners' satisfaction with their boiler brand and how likely they'd be to recommend it to a friend. 

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