Head to head
Telford Tempest 170 Direct vs Vaillant aroTHERM plus 7kW
The Telford Tempest 170 Direct is a direct unvented hot water cylinder, 170 litres. The Vaillant aroTHERM plus 7kW is a r290 monobloc air source heat pump, 7 kw heat output.
Last reviewed 13 September 2026
Specifications side by side
| Telford Tempest 170 Direct | Vaillant aroTHERM plus 7kW | |
|---|---|---|
| Dimensions | 1200 mm high x 510 mm diameter (approx.) | 1565 x 1100 x 450 mm (H x W x D) |
| Weight | 40 kg empty, 208 kg full | 194 kg (operating) |
| Capacity | 170 litres | - |
| Immersion heater | 2 x 3kW, 240V single phase | - |
| Max inlet pressure | 3 bar (inlet control group) | - |
| Warranty | Lifetime guarantee on the cylinder (25 years internal), 2 years on components | - |
| Heat output | - | 7 kW |
| SCOP | - | up to 5.03 |
| Refrigerant | - | R290 (propane), low GWP |
| Sound power | - | 58 dB(A) at A7/W35, 60 dB(A) at A7/W55 |
| Max flow temperature | - | 75C |
Sources: Telford Tempest 170 Direct, Vaillant aroTHERM plus 7kW. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the Tempest 170 Direct if...
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 →Buy or hire the aroTHERM plus 7kW if...
A mid-size aroTHERM plus for a typical three-bed house. It is taller and heavier than the 5kW unit, reflecting a larger outdoor cabinet, and shares the same R290 refrigerant and 75C maximum flow temperature.
Full aroTHERM plus 7kW specifications →Common questions
What is the difference between the Telford Tempest 170 Direct and the Vaillant aroTHERM plus 7kW?
The Telford Tempest 170 Direct is a direct unvented hot water cylinder, 170 litres; the Vaillant aroTHERM plus 7kW is a r290 monobloc air source heat pump, 7 kW heat output.
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