Head to head
Glow-worm Energy Combi 25C 25kW vs Joule Cyclone Air 150L Direct
The Glow-worm Energy Combi 25C 25kW comes with 6 years more warranty.
Last reviewed 13 September 2026
Key differences
- Warranty: the Glow-worm Energy Combi 25C 25kW comes with 6 years more warranty.
Specifications side by side
| Glow-worm Energy Combi 25C 25kW | Joule Cyclone Air 150L Direct | |
|---|---|---|
| Dimensions | 700 x 390 x 280 mm | 1196 x 540 x 540 mm (H x W x D) |
| Warranty | 7 years | 1 year manufacturer's warranty |
| Hot water output | 25.7 kW | - |
| Central heating output | 18 kW | - |
| ErP class | A | - |
| Seasonal efficiency | 94% | - |
| Weight | 32 kg | - |
| Hot water flow rate | 10.4 litres per minute | - |
| Capacity | - | 150 litres |
| Heat-up time | - | 57 minutes (full tank, 6kW immersion) |
| Immersion heater | - | 6kW (2 x 3kW) |
Sources: Glow-worm Energy Combi 25C 25kW, Joule Cyclone Air 150L Direct. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the Energy Combi 25C 25kW if...
- you want one that comes with 6 years more warranty
A gas combi boiler with 25.7 kW of hot water output, sized for a flat or small house with one bathroom. It delivers about 10.4 litres per minute of hot water, which decides how well a shower runs while a tap is on. Warranty: 7 years. Seasonal efficiency is 94%.
Full Energy Combi 25C 25kW specifications →Buy or hire the Cyclone Air 150L Direct if...
A 150 litre direct unvented cylinder from Joule's Cyclone range, heated by twin immersion elements rather than a boiler or heat pump coil. It suits a property with electric-only heating or a holiday let, reheating a full tank in around 57 minutes.
Full Cyclone Air 150L Direct specifications →Common questions
What is the difference between the Glow-worm Energy Combi 25C 25kW and the Joule Cyclone Air 150L Direct?
The Glow-worm Energy Combi 25C 25kW comes with 6 years more warranty. The Glow-worm Energy Combi 25C 25kW is a gas combi boiler, 25.7 kW hot water output; the Joule Cyclone Air 150L Direct is a direct unvented hot water cylinder, 150 litres.
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