Head to head
Vaillant aroTHERM plus 5kW vs Worcester Bosch Greenstar 8000 Life 40kW combi
The Vaillant aroTHERM plus 5kW is a r290 monobloc air source heat pump, 5 kw heat output. The Worcester Bosch Greenstar 8000 Life 40kW combi is a gas combi boiler, 40 kw hot water output.
Last reviewed 13 September 2026
Specifications side by side
| Vaillant aroTHERM plus 5kW | Worcester Bosch Greenstar 8000 Life 40kW combi | |
|---|---|---|
| Dimensions | 965 x 1100 x 450 mm (H x W x D) | 780 x 440 x 365 mm |
| Heat output | 5 kW | - |
| SCOP | up to 5.03 | - |
| Refrigerant | R290 (propane), low GWP | - |
| Sound power | 53 dB(A) at A7/W35, 58 dB(A) at A7/W55 | - |
| Weight | 128 kg (operating) | - |
| Max flow temperature | 75C | - |
| Hot water output | - | 40 kW |
| Central heating output | - | 40 kW |
| ErP class | - | A |
| Seasonal efficiency | - | 94% |
| Warranty | - | 12 years when installed by a Worcester Bosch accredited installer |
| Hot water flow rate | - | 14.3 litres per minute |
Sources: Vaillant aroTHERM plus 5kW, Worcester Bosch Greenstar 8000 Life 40kW combi. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the aroTHERM plus 5kW if...
The smallest aroTHERM plus, sized for a well-insulated flat or small house. It uses the natural refrigerant R290 rather than an F-gas, and reaches a 75C flow temperature, which helps it work with existing radiators on a retrofit job.
Full aroTHERM plus 5kW specifications →Buy or hire the Greenstar 8000 Life 40kW combi if...
A gas combi boiler with 40 kW of hot water output, sized for a larger house with two bathrooms. It delivers about 14.3 litres per minute of hot water, which decides how well a shower runs while a tap is on. Warranty: 12 years when installed by a Worcester Bosch accredited installer. Seasonal efficiency is 94%.
Full Greenstar 8000 Life 40kW combi specifications →Common questions
What is the difference between the Vaillant aroTHERM plus 5kW and the Worcester Bosch Greenstar 8000 Life 40kW combi?
The Vaillant aroTHERM plus 5kW is a r290 monobloc air source heat pump, 5 kW heat output; the Worcester Bosch Greenstar 8000 Life 40kW combi is a gas combi boiler, 40 kW hot water output.
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