Head to head
Grant Aerona3 R32 13kW vs Worcester Bosch Greenstar 4000 30kW combi
The Worcester Bosch Greenstar 4000 30kW combi comes with 3 years more warranty.
Last reviewed 13 September 2026
Key differences
- Warranty: the Worcester Bosch Greenstar 4000 30kW combi comes with 3 years more warranty.
Specifications side by side
| Grant Aerona3 R32 13kW | Worcester Bosch Greenstar 4000 30kW combi | |
|---|---|---|
| Dimensions | 1418 x 1024 x 403 mm (H x W x D) | 710 x 400 x 310 mm |
| Weight | 99 kg | 32.3 kg |
| Warranty | 7 years when installed by a Grant G1 accredited installer | 10 years |
| Heat output | 13 kW | - |
| SCOP | 5.40 (35C flow), 3.72 (55C flow) | - |
| Refrigerant | R32 | - |
| Hot water output | - | 30 kW |
| Central heating output | - | 30 kW |
| ErP class | - | A |
| Seasonal efficiency | - | 94% |
| Hot water flow rate | - | 12.3 litres per minute |
Sources: Grant Aerona3 R32 13kW, 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 Aerona3 R32 13kW if...
A 13kW 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 13kW specifications →Buy or hire the Greenstar 4000 30kW combi if...
- you want one that comes with 3 years more warranty
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 Grant Aerona3 R32 13kW and the Worcester Bosch Greenstar 4000 30kW combi?
The Worcester Bosch Greenstar 4000 30kW combi comes with 3 years more warranty. The Grant Aerona3 R32 13kW is a r32 inverter driven air source heat pump, 13 kW heat output; the Worcester Bosch Greenstar 4000 30kW combi is a gas combi boiler, 30 kW hot water output.
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