Head to head
Grant Aerona3 R32 17kW vs Viessmann Vitocal 150-A10
The Grant Aerona3 R32 17kW is a r32 inverter driven air source heat pump, 17 kw heat output. The Viessmann Vitocal 150-A10 is a r290 air source heat pump, 7.3 kw heat output.
Last reviewed 13 September 2026
Specifications side by side
| Grant Aerona3 R32 17kW | Viessmann Vitocal 150-A10 | |
|---|---|---|
| Heat output | 17 kW | 7.3 kW at A7/W35 |
| Refrigerant | R32 | R290 (propane), GWP 0.02 |
| Dimensions | 1418 x 1024 x 403 mm (H x W x D) | 920 x 450 x 360 mm (H x W x D) (indoor unit); 841 x 1144 x 600 mm (H x W x D, single fan) (outdoor unit) |
| Weight | 118 kg | 162 kg (single fan) (outdoor unit) |
| SCOP | 4.54 (35C flow), 3.57 (55C flow) | - |
| Warranty | 7 years when installed by a Grant G1 accredited installer | - |
| COP | - | 4.7-5.0 at A7/W35 |
| Sound power | - | 51 dB(A) assessed total at A7/W55 |
| Max flow temperature | - | 70C down to -10C outdoor |
Sources: Grant Aerona3 R32 17kW, Viessmann Vitocal 150-A10. Figures vary by model year and options, so check with the supplier before you commit.
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 →Buy or hire the Vitocal 150-A10 if...
A Vitocal 150-A monobloc-style split heat pump using the natural refrigerant R290, rated at 7.3kW and reaching a 70C flow for boiler-replacement work. Viessmann-trained installers can extend the standard warranty on registration.
Full Vitocal 150-A10 specifications →Common questions
What is the difference between the Grant Aerona3 R32 17kW and the Viessmann Vitocal 150-A10?
The Grant Aerona3 R32 17kW is a r32 inverter driven air source heat pump, 17 kW heat output; the Viessmann Vitocal 150-A10 is a r290 air source heat pump, 7.3 kW heat output.
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