Head to head
Baxi 600 Combi 2 24kW vs Grant Aerona3 R32 13kW
The Baxi 600 Combi 2 24kW is a gas combi boiler, 25.8 kw hot water output. The Grant Aerona3 R32 13kW is a r32 inverter driven air source heat pump, 13 kw heat output.
Last reviewed 13 September 2026
Specifications side by side
| Baxi 600 Combi 2 24kW | Grant Aerona3 R32 13kW | |
|---|---|---|
| Dimensions | 700 x 395 x 297 mm | 1418 x 1024 x 403 mm (H x W x D) |
| Weight | 29.5 kg | 99 kg |
| Warranty | 7 years | 7 years when installed by a Grant G1 accredited installer |
| Hot water output | 25.8 kW | - |
| Central heating output | 21.2 kW | - |
| ErP class | A | - |
| Seasonal efficiency | 93% | - |
| Hot water flow rate | 10.2 litres per minute | - |
| Heat output | - | 13 kW |
| SCOP | - | 5.40 (35C flow), 3.72 (55C flow) |
| Refrigerant | - | R32 |
Sources: Baxi 600 Combi 2 24kW, Grant Aerona3 R32 13kW. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the 600 Combi 2 24kW if...
A gas combi boiler with 25.8 kW of hot water output, sized for a flat or small house with one bathroom. It delivers about 10.2 litres per minute of hot water, which decides how well a shower runs while a tap is on. Warranty: 7 years. Seasonal efficiency is 93%.
Full 600 Combi 2 24kW specifications →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 →Common questions
What is the difference between the Baxi 600 Combi 2 24kW and the Grant Aerona3 R32 13kW?
The Baxi 600 Combi 2 24kW is a gas combi boiler, 25.8 kW hot water output; the Grant Aerona3 R32 13kW is a r32 inverter driven air source heat pump, 13 kW heat output.
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