Head to head
Vaillant aroTHERM plus 7kW vs Viessmann Vitodens 100-W 35kW combi
The Vaillant aroTHERM plus 7kW is a r290 monobloc air source heat pump, 7 kw heat output. The Viessmann Vitodens 100-W 35kW combi is a gas combi boiler, 34.9 kw hot water output.
Last reviewed 13 September 2026
Specifications side by side
| Vaillant aroTHERM plus 7kW | Viessmann Vitodens 100-W 35kW combi | |
|---|---|---|
| Dimensions | 1565 x 1100 x 450 mm (H x W x D) | 700 x 400 x 360 mm |
| Weight | 194 kg (operating) | 35 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 | - | 34.9 kW |
| Central heating output | - | 32 kW |
| ErP class | - | A |
| Seasonal efficiency | - | 98% |
| Warranty | - | 5 years |
| Hot water flow rate | - | 17 litres per minute |
Sources: Vaillant aroTHERM plus 7kW, Viessmann Vitodens 100-W 35kW 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 Vitodens 100-W 35kW combi if...
A gas combi boiler with 34.9 kW of hot water output, sized for a larger house with two bathrooms. It delivers about 17 litres per minute of hot water, which decides how well a shower runs while a tap is on. Warranty: 5 years. Seasonal efficiency is 98%.
Full Vitodens 100-W 35kW combi specifications →Common questions
What is the difference between the Vaillant aroTHERM plus 7kW and the Viessmann Vitodens 100-W 35kW combi?
The Vaillant aroTHERM plus 7kW is a r290 monobloc air source heat pump, 7 kW heat output; the Viessmann Vitodens 100-W 35kW combi is a gas combi boiler, 34.9 kW hot water output.
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