Boiler brands rated Glow-worm

About Glow-worm boilers

British boiler brand Glow-worm has over 75 years of experience in the heating business and says it is committed to top quality, reliability and exceptional durability.

Glow-worm high efficiency boilers

Glow-worm offers several different ranges of gas combi boilers, including Glow-worm Flexicom boilers, Glow-worm Ultracom boilers and Glow-worm Xtramax boilers. It also offers open-vent boilers, system boilers and system store boilers.

If you want to make sure you choose a particularly efficient boiler or choose the best size for your home, use our compare boilers tool.

Glow-worm boilers – the Which? verdict

We survey thousands of boiler owners to find out how satisfied they are with their boiler. Check out the results of our boiler owners' views survey to find out how Glow-worm’s customer score compares with other brands.

Only logged in Which? members can view full scores in our boiler reliability table below. If you're not already a member, you can sign up to try out full access for one month, for just £1.

Brand data for Glow-worm gas condensing boilers
Which? Survey results	Score
Brand reliability
Which? Customer Score
Ownership among Which? members with gas boilers
Most common faults experienced by owners
Frozen condensate run-off pipe
Boiler keeps switching itself off
Problem with built-in controls
Boiler completely broke down
Problem with the burner
Water leaking from the boiler
Boiler noisy in operation

Table notes

Average customer score is 71% and average reliability score is 71%, based on responses from 1,706 Which? connect panel members. Scores are based on boilers bought since April 2005. Brand reliability sample size (165). Customer score sample size (167). The most common faults requiring repair of Glow-worm boilers installed since April 2005; sample size (53).

Glow-worm warranties and servicing

All Ultracom, Flexicom and Ultrapower boilers come with a two-year parts and labour warranty. The Betacom a have a one-year parts and labour warranty.

For warranty protection, either complete and return the warranty form that comes with the box or fill in the warranty form online.

Glow-worm will provide extended warranty packages of from three to five years.

Glow-worm extended warranties

01773 824639

Glow-worm repairs and spares

Glow-worm has its own team of 200 Gas Safe registered service engineers.

Boiler breakdown cover is also available from Glow-worm; there are three levels of cover available.

Boiler breakdown cover quotes

0800 032 7340

Glow-worm spare parts

01773 596020

Glow-worm contact details

You can contact Glow-worm by writing to:

Glow-worm
Nottingham Road,
Belper, Derbyshire.
DE56 1JT

Or through its website (www.glow-wormheating.co.uk).

Glow-worm customer service

01773 828 100

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