Head to head
Vaillant ecoFIT pure 835 35kW combi vs Viessmann Vitocal 150-A06
The Vaillant ecoFIT pure 835 35kW combi is a gas combi boiler, 35 kw hot water output. The Viessmann Vitocal 150-A06 is a r290 air source heat pump, 4.8 kw heat output.
Last reviewed 13 September 2026
Specifications side by side
| Vaillant ecoFIT pure 835 35kW combi | Viessmann Vitocal 150-A06 | |
|---|---|---|
| Dimensions | 700 x 390 x 295 mm | 920 x 450 x 360 mm (H x W x D) (indoor unit); 841 x 1144 x 600 mm (H x W x D, single fan) (outdoor unit) |
| Weight | 33 kg | 162 kg (single fan) (outdoor unit) |
| Hot water output | 35 kW | - |
| Central heating output | 26.7 kW | - |
| ErP class | A | - |
| Seasonal efficiency | 94% | - |
| Warranty | 10 years when installed by Vaillant Advance installer | - |
| Hot water flow rate | 14.1 litres per minute | - |
| Heat output | - | 4.8 kW at A7/W35 |
| COP | - | 4.7-5.0 at A7/W35 |
| Refrigerant | - | R290 (propane), GWP 0.02 |
| Sound power | - | 51 dB(A) assessed total at A7/W55 |
| Max flow temperature | - | 70C down to -10C outdoor |
Sources: Vaillant ecoFIT pure 835 35kW combi, Viessmann Vitocal 150-A06. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the ecoFIT pure 835 35kW combi if...
A gas combi boiler with 35 kW of hot water output, sized for a larger house with two bathrooms. It delivers about 14.1 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 835 35kW combi specifications →Buy or hire the Vitocal 150-A06 if...
A Vitocal 150-A monobloc-style split heat pump using the natural refrigerant R290, rated at 4.8kW and reaching a 70C flow for boiler-replacement work. Viessmann-trained installers can extend the standard warranty on registration.
Full Vitocal 150-A06 specifications →Common questions
What is the difference between the Vaillant ecoFIT pure 835 35kW combi and the Viessmann Vitocal 150-A06?
The Vaillant ecoFIT pure 835 35kW combi is a gas combi boiler, 35 kW hot water output; the Viessmann Vitocal 150-A06 is a r290 air source heat pump, 4.8 kW heat output.
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