Head to head
Glow-worm Energy Combi 25C 25kW vs Vaillant aroTHERM plus 7kW
The Glow-worm Energy Combi 25C 25kW is a gas combi boiler, 25.7 kw hot water output. The Vaillant aroTHERM plus 7kW is a r290 monobloc air source heat pump, 7 kw heat output.
Last reviewed 13 September 2026
Specifications side by side
| Glow-worm Energy Combi 25C 25kW | Vaillant aroTHERM plus 7kW | |
|---|---|---|
| Dimensions | 700 x 390 x 280 mm | 1565 x 1100 x 450 mm (H x W x D) |
| Weight | 32 kg | 194 kg (operating) |
| Hot water output | 25.7 kW | - |
| Central heating output | 18 kW | - |
| ErP class | A | - |
| Seasonal efficiency | 94% | - |
| Warranty | 7 years | - |
| Hot water flow rate | 10.4 litres per minute | - |
| Heat output | - | 7 kW |
| SCOP | - | up to 5.03 |
| Refrigerant | - | R290 (propane), low GWP |
| Sound power | - | 58 dB(A) at A7/W35, 60 dB(A) at A7/W55 |
| Max flow temperature | - | 75C |
Sources: Glow-worm Energy Combi 25C 25kW, Vaillant aroTHERM plus 7kW. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the Energy Combi 25C 25kW if...
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 aroTHERM plus 7kW if...
A mid-size aroTHERM plus for a typical three-bed house. It is taller and heavier than the 5kW unit, reflecting a larger outdoor cabinet, and shares the same R290 refrigerant and 75C maximum flow temperature.
Full aroTHERM plus 7kW specifications →Common questions
What is the difference between the Glow-worm Energy Combi 25C 25kW and the Vaillant aroTHERM plus 7kW?
The Glow-worm Energy Combi 25C 25kW is a gas combi boiler, 25.7 kW hot water output; the Vaillant aroTHERM plus 7kW is a r290 monobloc air source heat pump, 7 kW heat output.
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