Head to head
Baxi 800 Combi 2 30kW vs Mitsubishi Electric Ecodan PUZ-WM85VAA 8.5kW
The Baxi 800 Combi 2 30kW is a gas combi boiler, 30 kw hot water output. The Mitsubishi Electric Ecodan PUZ-WM85VAA 8.5kW is a r32 monobloc air source heat pump, 8.5 kw heat output.
Last reviewed 13 September 2026
Specifications side by side
| Baxi 800 Combi 2 30kW | Mitsubishi Electric Ecodan PUZ-WM85VAA 8.5kW | |
|---|---|---|
| Dimensions | 700 x 390 x 285 mm | 1020 x 1050 x 480 mm (H x W x D) |
| Hot water output | 30 kW | - |
| Central heating output | 21.2 kW | - |
| ErP class | A | - |
| Seasonal efficiency | 93% | - |
| Warranty | 10 years | - |
| Hot water flow rate | 12.2 litres per minute | - |
| Heat output | - | 8.5 kW at A-7/W35 |
| ErP rating | - | 145% (MCS certified) |
| Refrigerant | - | R32, 2.2 kg charge |
| Sound power | - | 58 dBA |
| Sound pressure at 1m | - | 45 dBA |
| Weight | - | 98 kg |
| Max flow temperature | - | 55C (space heating) |
Sources: Baxi 800 Combi 2 30kW, Mitsubishi Electric Ecodan PUZ-WM85VAA 8.5kW. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the 800 Combi 2 30kW if...
A gas combi boiler with 30 kW of hot water output, sized for a three-bed house with one or two bathrooms. It delivers about 12.2 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 30kW specifications →Buy or hire the Ecodan PUZ-WM85VAA 8.5kW if...
An 8.5kW R32 monobloc heat pump, the middle unit in the Ecodan PUZ-WM line and a common size for a three-bed house. It runs on a single-phase 220-240V supply, weighs 98 kg and reaches a 55C flow temperature for radiator systems.
Full Ecodan PUZ-WM85VAA 8.5kW specifications →Common questions
What is the difference between the Baxi 800 Combi 2 30kW and the Mitsubishi Electric Ecodan PUZ-WM85VAA 8.5kW?
The Baxi 800 Combi 2 30kW is a gas combi boiler, 30 kW hot water output; the Mitsubishi Electric Ecodan PUZ-WM85VAA 8.5kW is a r32 monobloc air source heat pump, 8.5 kW heat output.
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