Head to head
Worcester Bosch Greenstar 5800i AW 5kW vs Worcester Bosch Greenstar 4000 30kW 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 4000 30kW combi is a gas combi boiler, 30 kw hot water output.
Last reviewed 13 September 2026
Specifications side by side
| Worcester Bosch Greenstar 5800i AW 5kW | Worcester Bosch Greenstar 4000 30kW combi | |
|---|---|---|
| Dimensions | 800 x 1100 x 540 mm (H x W x D) | 710 x 400 x 310 mm |
| Weight | 143 kg | 32.3 kg |
| Heat output | 6.80 kW at 7/35C | - |
| SCOP | 4.53 (MCS, 35C flow) | - |
| Refrigerant | R290 (propane) | - |
| Sound pressure | 42 dB(A) | - |
| Max flow temperature | 75C | - |
| 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: Worcester Bosch Greenstar 5800i AW 5kW, 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 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 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 Worcester Bosch Greenstar 5800i AW 5kW and the Worcester Bosch Greenstar 4000 30kW 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 4000 30kW combi is a gas combi boiler, 30 kW hot water output.
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