Head to head
Grant Aerona3 R32 6kW vs Worcester Bosch Greenstar 5800i AW 7kW
The Grant Aerona3 R32 6kW is a r32 inverter driven air source heat pump, 6 kw heat output. The Worcester Bosch Greenstar 5800i AW 7kW is a r290 monobloc air source heat pump, 7.97 kw heat output.
Last reviewed 13 September 2026
Specifications side by side
| Grant Aerona3 R32 6kW | Worcester Bosch Greenstar 5800i AW 7kW | |
|---|---|---|
| Heat output | 6 kW | 7.97 kW at 7/35C |
| SCOP | 4.61 (35C flow), 3.29 (55C flow) | 4.54 (MCS, 35C flow) |
| Refrigerant | R32 | R290 (propane) |
| Dimensions | 675 x 898 x 379.4 mm (H x W x D) | 800 x 1100 x 540 mm (H x W x D) |
| Weight | 51 kg | 143 kg |
| Warranty | 7 years when installed by a Grant G1 accredited installer | - |
| Sound pressure | - | 42 dB(A) |
| Max flow temperature | - | 75C |
Sources: Grant Aerona3 R32 6kW, Worcester Bosch Greenstar 5800i AW 7kW. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the Aerona3 R32 6kW if...
A 6kW R32 inverter driven heat pump from Grant's Aerona3 range, a common choice for off-gas-grid homes that previously ran an oil boiler. It carries a 7 year warranty through Grant's G1 installer scheme, one of the longer standard terms in this category.
Full Aerona3 R32 6kW specifications →Buy or hire the Greenstar 5800i AW 7kW if...
The larger 5800i AW unit, for a slightly bigger house than the 5kW model while sharing the same cabinet size and 42 dB(A) sound rating. Its R290 refrigerant and 75C flow temperature suit a radiator-based retrofit.
Full Greenstar 5800i AW 7kW specifications →Common questions
What is the difference between the Grant Aerona3 R32 6kW and the Worcester Bosch Greenstar 5800i AW 7kW?
The Grant Aerona3 R32 6kW is a r32 inverter driven air source heat pump, 6 kW heat output; the Worcester Bosch Greenstar 5800i AW 7kW is a r290 monobloc air source heat pump, 7.97 kW heat output.
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