Head to head
Baxi 800 Combi 2 36kW vs Grant Aerona3 R32 17kW
The Baxi 800 Combi 2 36kW comes with 3 years more warranty.
Last reviewed 13 September 2026
Key differences
- Warranty: the Baxi 800 Combi 2 36kW comes with 3 years more warranty.
Specifications side by side
| Baxi 800 Combi 2 36kW | Grant Aerona3 R32 17kW | |
|---|---|---|
| Dimensions | 700 x 390 x 285 mm | 1418 x 1024 x 403 mm (H x W x D) |
| Weight | 29.5 kg | 118 kg |
| Warranty | 10 years | 7 years when installed by a Grant G1 accredited installer |
| Hot water output | 36 kW | - |
| Central heating output | 26.4 kW | - |
| ErP class | A | - |
| Seasonal efficiency | 93% | - |
| Hot water flow rate | 15 litres per minute | - |
| Heat output | - | 17 kW |
| SCOP | - | 4.54 (35C flow), 3.57 (55C flow) |
| Refrigerant | - | R32 |
Sources: Baxi 800 Combi 2 36kW, Grant Aerona3 R32 17kW. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the 800 Combi 2 36kW if...
- you want one that comes with 3 years more warranty
A gas combi boiler with 36 kW of hot water output, sized for a larger house with two bathrooms. It delivers about 15 litres per minute of hot water, which decides how well a shower runs while a tap is on. Warranty: 10 years. Seasonal efficiency is 93%.
Full 800 Combi 2 36kW specifications →Buy or hire the Aerona3 R32 17kW if...
A 17kW 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 17kW specifications →Common questions
What is the difference between the Baxi 800 Combi 2 36kW and the Grant Aerona3 R32 17kW?
The Baxi 800 Combi 2 36kW comes with 3 years more warranty. The Baxi 800 Combi 2 36kW is a gas combi boiler, 36 kW hot water output; the Grant Aerona3 R32 17kW is a r32 inverter driven air source heat pump, 17 kW heat output.
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