Head to head
Baxi 800 Combi 2 36kW vs Vaillant aroTHERM plus 7kW
The Baxi 800 Combi 2 36kW is a gas combi boiler, 36 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
| Baxi 800 Combi 2 36kW | Vaillant aroTHERM plus 7kW | |
|---|---|---|
| Dimensions | 700 x 390 x 285 mm | 1565 x 1100 x 450 mm (H x W x D) |
| Weight | 29.5 kg | 194 kg (operating) |
| Hot water output | 36 kW | - |
| Central heating output | 26.4 kW | - |
| ErP class | A | - |
| Seasonal efficiency | 93% | - |
| Warranty | 10 years | - |
| Hot water flow rate | 15 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: Baxi 800 Combi 2 36kW, Vaillant aroTHERM plus 7kW. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the 800 Combi 2 36kW if...
A gas combi boiler with 36 kW of hot water output, sized for a larger house with two bathrooms. It delivers about 15 litres per minute of hot water, which decides how well a shower runs while a tap is on. Warranty: 10 years. Seasonal efficiency is 93%.
Full 800 Combi 2 36kW 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 Baxi 800 Combi 2 36kW and the Vaillant aroTHERM plus 7kW?
The Baxi 800 Combi 2 36kW is a gas combi boiler, 36 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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