Head to head
Grant Aerona3 R32 17kW vs Vaillant aroTHERM plus 5kW
The Grant Aerona3 R32 17kW is a r32 inverter driven air source heat pump, 17 kw heat output. The Vaillant aroTHERM plus 5kW is a r290 monobloc air source heat pump, 5 kw heat output.
Last reviewed 13 September 2026
Specifications side by side
| Grant Aerona3 R32 17kW | Vaillant aroTHERM plus 5kW | |
|---|---|---|
| Heat output | 17 kW | 5 kW |
| SCOP | 4.54 (35C flow), 3.57 (55C flow) | up to 5.03 |
| Refrigerant | R32 | R290 (propane), low GWP |
| Dimensions | 1418 x 1024 x 403 mm (H x W x D) | 965 x 1100 x 450 mm (H x W x D) |
| Weight | 118 kg | 128 kg (operating) |
| Warranty | 7 years when installed by a Grant G1 accredited installer | - |
| Sound power | - | 53 dB(A) at A7/W35, 58 dB(A) at A7/W55 |
| Max flow temperature | - | 75C |
Sources: Grant Aerona3 R32 17kW, Vaillant aroTHERM plus 5kW. 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 aroTHERM plus 5kW if...
The smallest aroTHERM plus, sized for a well-insulated flat or small house. It uses the natural refrigerant R290 rather than an F-gas, and reaches a 75C flow temperature, which helps it work with existing radiators on a retrofit job.
Full aroTHERM plus 5kW specifications →Common questions
What is the difference between the Grant Aerona3 R32 17kW and the Vaillant aroTHERM plus 5kW?
The Grant Aerona3 R32 17kW is a r32 inverter driven air source heat pump, 17 kW heat output; the Vaillant aroTHERM plus 5kW is a r290 monobloc air source heat pump, 5 kW heat output.
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