trades and handymen - head to head
Glow-worm vs Joule
Both makes turn up on the same shortlists, and the honest answer is that they are built for different buyers rather than one being better than the other. Here is what actually separates them - from a directory that sells neither.
| Glow-worm | Joule | |
|---|---|---|
| Built in | United Kingdom (Belper) | United Kingdom (Portadown) |
| Making trailers since | 1934 | 1972 |
| UK availability | Available, smaller network | Available, smaller network |
| Range covers | Domestic gas boilers, Boiler controls, Heating systems | Unvented hot water cylinders, Solar thermal cylinders, Heat pump cylinders, Thermal stores |
| Best known for | Ultimate3 Combi | Cyclone |
Choose Glow-worm if...
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.
Look at: Ultimate3 Combi, Energy, Easicom
Full Glow-worm profile →Choose Joule if...
Joule is a Northern Ireland cylinder manufacturer whose Cyclone range is built in duplex stainless steel for direct and indirect installations. It fits both boiler and heat pump setups where a merchant stocks the size needed.
Look at: Cyclone
Full Joule profile →Where to hire or buy either
Most UK trades and handymen companies carry several makes and advertise none of them, so the practical move is to find the firms covering your area and ask what is on the yard.
Glow-worm vs Joule - common questions
Is Glow-worm better than Joule?
Neither is better outright - they are built for different buyers. 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. Joule is a Northern Ireland cylinder manufacturer whose Cyclone range is built in duplex stainless steel for direct and indirect installations. It fits both boiler and heat pump setups where a merchant stocks the size needed.
Which is easier to get hold of in the UK, Glow-worm or Joule?
Glow-worm: Built at the Derwent Foundry in Belper and fitted by installers across the UK. Joule: Sold across the UK through plumbing and heating merchants and Joule-approved installers.
Can I hire rather than buy?
Yes. Most UK trades and handymen companies hire as well as sell, and many carry several makes without listing them. Search by your area and ask what they have on the yard.
Other comparisons
GetBrent is an independent directory and is not a dealer for, nor affiliated with, either manufacturer. Brand and model names are the trademarks of their owners, used here only to identify the products they refer to. Specifications vary by model year and market - confirm weights, dimensions and towing limits with the supplier before hiring or buying.