Head to head
Vaillant aroTHERM plus 7kW vs Vaillant ecoFIT pure 825 25kW combi
The Vaillant aroTHERM plus 7kW is a r290 monobloc air source heat pump, 7 kw heat output. The Vaillant ecoFIT pure 825 25kW combi is a gas combi boiler, 25.2 kw hot water output.
Last reviewed 13 September 2026
Specifications side by side
| Vaillant aroTHERM plus 7kW | Vaillant ecoFIT pure 825 25kW combi | |
|---|---|---|
| Dimensions | 1565 x 1100 x 450 mm (H x W x D) | 700 x 390 x 295 mm |
| Weight | 194 kg (operating) | 32 kg |
| 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 | - |
| Hot water output | - | 25.2 kW |
| Central heating output | - | 19.1 kW |
| ErP class | - | A |
| Seasonal efficiency | - | 94% |
| Warranty | - | 10 years when installed by Vaillant Advance installer |
| Hot water flow rate | - | 10.4 litres per minute |
Sources: Vaillant aroTHERM plus 7kW, Vaillant ecoFIT pure 825 25kW combi. Figures vary by model year and options, so check with the supplier before you commit.
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 →Buy or hire the ecoFIT pure 825 25kW combi if...
A gas combi boiler with 25.2 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: 10 years when installed by Vaillant Advance installer. Seasonal efficiency is 94%.
Full ecoFIT pure 825 25kW combi specifications →Common questions
What is the difference between the Vaillant aroTHERM plus 7kW and the Vaillant ecoFIT pure 825 25kW combi?
The Vaillant aroTHERM plus 7kW is a r290 monobloc air source heat pump, 7 kW heat output; the Vaillant ecoFIT pure 825 25kW combi is a gas combi boiler, 25.2 kW hot water output.
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