Head to head
Mitsubishi Electric Ecodan PUZ-WM112VAA 11.2kW vs Worcester Bosch Greenstar 4000 30kW combi
The Mitsubishi Electric Ecodan PUZ-WM112VAA 11.2kW is a r32 monobloc air source heat pump, 11.2 kw heat output. The Worcester Bosch Greenstar 4000 30kW combi is a gas combi boiler, 30 kw hot water output.
Last reviewed 13 September 2026
Specifications side by side
| Mitsubishi Electric Ecodan PUZ-WM112VAA 11.2kW | Worcester Bosch Greenstar 4000 30kW combi | |
|---|---|---|
| Dimensions | 1020 x 1050 x 480 mm (H x W x D) | 710 x 400 x 310 mm |
| Weight | 119 kg | 32.3 kg |
| Heat output | 11.2 kW at -7C outdoor / 35C flow | - |
| SCOP | 4.78 (MCS, 35C flow), 3.34 (55C flow) | - |
| Refrigerant | R32, 3.0 kg charge | - |
| Sound power | 60 dBA | - |
| Sound pressure at 1m | 45 dBA | - |
| Max flow temperature | 55C (space heating), 35C (combination heater) | - |
| Hot water output | - | 30 kW |
| Central heating output | - | 30 kW |
| ErP class | - | A |
| Seasonal efficiency | - | 94% |
| Warranty | - | 10 years |
| Hot water flow rate | - | 12.3 litres per minute |
Sources: Mitsubishi Electric Ecodan PUZ-WM112VAA 11.2kW, Worcester Bosch Greenstar 4000 30kW combi. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the Ecodan PUZ-WM112VAA 11.2kW if...
The largest domestic unit in the Ecodan PUZ-WM range at 11.2kW, sized for a larger house or one with a higher heat loss. Its SCOP of 4.78 at a 35C flow is among the higher MCS-rated figures in this range, and it weighs 119 kg against 98 kg for the smaller units.
Full Ecodan PUZ-WM112VAA 11.2kW specifications →Buy or hire the Greenstar 4000 30kW combi 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 12.3 litres per minute of hot water, which decides how well a shower runs while a tap is on. Warranty: 10 years. Seasonal efficiency is 94%.
Full Greenstar 4000 30kW combi specifications →Common questions
What is the difference between the Mitsubishi Electric Ecodan PUZ-WM112VAA 11.2kW and the Worcester Bosch Greenstar 4000 30kW combi?
The Mitsubishi Electric Ecodan PUZ-WM112VAA 11.2kW is a r32 monobloc air source heat pump, 11.2 kW heat output; the Worcester Bosch Greenstar 4000 30kW combi is a gas combi boiler, 30 kW hot water output.
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