Head to head
Grant Aerona3 R32 10kW vs Telford Tempest 300 Indirect
The Grant Aerona3 R32 10kW comes with 5 years more warranty.
Last reviewed 13 September 2026
Key differences
- Warranty: the Grant Aerona3 R32 10kW comes with 5 years more warranty.
Specifications side by side
| Grant Aerona3 R32 10kW | Telford Tempest 300 Indirect | |
|---|---|---|
| Dimensions | 882 x 874 x 405 mm (H x W x D) | 1750 mm high x 580 mm diameter |
| Weight | 70 kg | 61 kg |
| Warranty | 7 years when installed by a Grant G1 accredited installer | Lifetime guarantee on the body with annual service, 2 year component guarantee |
| Heat output | 10 kW | - |
| SCOP | 5.20 (35C flow), 3.47 (55C flow) | - |
| Refrigerant | R32 | - |
| Capacity | - | 300 litres |
| Material | - | 2304 duplex stainless steel |
| Relief valve setting | - | 7 bar / 90C |
| Immersion heater | - | 3kW, 240V single phase, included |
Sources: Grant Aerona3 R32 10kW, Telford Tempest 300 Indirect. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the Aerona3 R32 10kW if...
- you want one that comes with 5 years more warranty
A 10kW 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 10kW specifications →Buy or hire the Tempest 300 Indirect if...
A 300 litre indirect cylinder for a larger household or a property with high simultaneous hot water demand, part of Telford's Tempest range. Like the smaller direct model it carries a lifetime body guarantee when serviced annually.
Full Tempest 300 Indirect specifications →Common questions
What is the difference between the Grant Aerona3 R32 10kW and the Telford Tempest 300 Indirect?
The Grant Aerona3 R32 10kW comes with 5 years more warranty. The Grant Aerona3 R32 10kW is a r32 inverter driven air source heat pump, 10 kW heat output; the Telford Tempest 300 Indirect is a indirect unvented hot water cylinder, 300 litres.
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