Head to head
Worcester Bosch Greenstar 5800i AW 5kW vs Worcester Bosch Greenstar 8000 Life 40kW combi
The Worcester Bosch Greenstar 5800i AW 5kW is a r290 monobloc air source heat pump, 6.80 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
| Worcester Bosch Greenstar 5800i AW 5kW | Worcester Bosch Greenstar 8000 Life 40kW combi | |
|---|---|---|
| Dimensions | 800 x 1100 x 540 mm (H x W x D) | 780 x 440 x 365 mm |
| Heat output | 6.80 kW at 7/35C | - |
| SCOP | 4.53 (MCS, 35C flow) | - |
| Refrigerant | R290 (propane) | - |
| Sound pressure | 42 dB(A) | - |
| Weight | 143 kg | - |
| 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: Worcester Bosch Greenstar 5800i AW 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 Greenstar 5800i AW 5kW if...
Worcester Bosch's entry-size 5800i AW, using the natural refrigerant R290 and reaching a 75C flow temperature for existing radiator systems. It is marketed as one of the quieter units in this size at 42 dB(A) sound pressure.
Full Greenstar 5800i AW 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 Worcester Bosch Greenstar 5800i AW 5kW and the Worcester Bosch Greenstar 8000 Life 40kW combi?
The Worcester Bosch Greenstar 5800i AW 5kW is a r290 monobloc air source heat pump, 6.80 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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