Head to head
Grant Aerona3 R32 10kW vs Telford Tempest 170 Direct
The Telford Tempest 170 Direct comes with 18 years more warranty.
Last reviewed 13 September 2026
Key differences
- Warranty: the Telford Tempest 170 Direct comes with 18 years more warranty.
Specifications side by side
| Grant Aerona3 R32 10kW | Telford Tempest 170 Direct | |
|---|---|---|
| Dimensions | 882 x 874 x 405 mm (H x W x D) | 1200 mm high x 510 mm diameter (approx.) |
| Weight | 70 kg | 40 kg empty, 208 kg full |
| Warranty | 7 years when installed by a Grant G1 accredited installer | Lifetime guarantee on the cylinder (25 years internal), 2 years on components |
| Heat output | 10 kW | - |
| SCOP | 5.20 (35C flow), 3.47 (55C flow) | - |
| Refrigerant | R32 | - |
| Capacity | - | 170 litres |
| Immersion heater | - | 2 x 3kW, 240V single phase |
| Max inlet pressure | - | 3 bar (inlet control group) |
Sources: Grant Aerona3 R32 10kW, Telford Tempest 170 Direct. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the Aerona3 R32 10kW if...
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 170 Direct if...
- you want one that comes with 18 years more warranty
A 170 litre direct unvented cylinder from Telford's Tempest range, built in duplex stainless steel with twin 3kW immersions rather than a boiler coil. It suits an all-electric property, and the cylinder body carries a lifetime guarantee when serviced annually.
Full Tempest 170 Direct specifications →Common questions
What is the difference between the Grant Aerona3 R32 10kW and the Telford Tempest 170 Direct?
The Telford Tempest 170 Direct comes with 18 years more warranty. The Grant Aerona3 R32 10kW is a r32 inverter driven air source heat pump, 10 kW heat output; the Telford Tempest 170 Direct is a direct unvented hot water cylinder, 170 litres.
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