trades and handymen brand
Glow-worm
Glow-worm has made gas boilers in Belper, Derbyshire since 1934 and is part of the same group as Vaillant. Its Energy and Ultimate ranges are a common budget-to-mid-price choice for replacement combis.
Last reviewed 13 September 2026
Built in
United Kingdom (Belper)
Manufacturing since
1934
UK availability
Available in the UK, smaller network
Built at the Derwent Foundry in Belper and fitted by installers across the UK.
What Glow-worm builds
Glow-worm model ranges
| Range | What it is |
|---|---|
| Ultimate3 Combi | condensing combi boiler |
| Energy | mid-range boiler series |
| Easicom | boiler control and management range |
How Glow-worm compares
These are the makes buyers actually cross-shop against Glow-worm.
Glow-worm vs Worcester Bosch
Worcester Bosch builds gas, oil and electric boilers and heat pumps in Worcester, and is part of the German Bosch group. It is one of the most fitted boiler makes in British homes, and most installers carry its Greenstar range. Longer warranties come through its accredited installer scheme.
Glow-worm vs Vaillant
Vaillant is a German heating maker founded in Remscheid in 1874. In the UK it sells gas combi, system and regular boilers under the ecoTEC and ecoFIT names, plus heat pumps, with extended warranties through its Vaillant Advance installer scheme.
Glow-worm vs Baxi
Baxi has made boilers in Britain since 1866 and now builds its gas boilers at a factory in Preston. Its 600 and 800 combi ranges are common replacements in houses and flats, and it also sells heat pumps and commercial heating.
Glow-worm vs Ideal Heating
Ideal Heating has built boilers in Hull since 1906. The Logic and Vogue ranges cover combi, system and heat-only boilers for homes, and the company also makes heat pumps and commercial boilers.
Glow-worm vs Viessmann
Viessmann is a German heating maker founded in 1917 in Allendorf and now owned by Carrier. Its Vitodens wall-hung gas boilers are sold in the UK alongside heat pumps, solar and hybrid systems.
UK companies hiring and selling Glow-worm
No listed company has told us they carry Glow-worm yet.
That does not mean nobody near you does - most trades and handymen firms carry several makes and list none of them. Start with the companies covering your area:
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GetBrent is an independent directory of UK hire and sales companies. We are not a Glow-worm dealer and have no affiliation with, or endorsement from, Glow-worm. The Glow-worm name and model names are trademarks of their owner, used here only to identify the products they refer to. Specifications vary by model year and market - always confirm weights, dimensions and towing limits with the supplier before hiring or buying.