Head to head
Joule Cyclone Air 150L Direct vs Telford Tempest 170 Direct
The Telford Tempest 170 Direct comes with 24 years more warranty.
Last reviewed 13 September 2026
Key differences
- Warranty: the Telford Tempest 170 Direct comes with 24 years more warranty.
Specifications side by side
| Joule Cyclone Air 150L Direct | Telford Tempest 170 Direct | |
|---|---|---|
| Capacity | 150 litres | 170 litres |
| Dimensions | 1196 x 540 x 540 mm (H x W x D) | 1200 mm high x 510 mm diameter (approx.) |
| Immersion heater | 6kW (2 x 3kW) | 2 x 3kW, 240V single phase |
| Warranty | 1 year manufacturer's warranty | Lifetime guarantee on the cylinder (25 years internal), 2 years on components |
| Heat-up time | 57 minutes (full tank, 6kW immersion) | - |
| Weight | - | 40 kg empty, 208 kg full |
| Max inlet pressure | - | 3 bar (inlet control group) |
Sources: Joule Cyclone Air 150L Direct, Telford Tempest 170 Direct. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the Cyclone Air 150L Direct if...
A 150 litre direct unvented cylinder from Joule's Cyclone range, heated by twin immersion elements rather than a boiler or heat pump coil. It suits a property with electric-only heating or a holiday let, reheating a full tank in around 57 minutes.
Full Cyclone Air 150L Direct specifications →Buy or hire the Tempest 170 Direct if...
- you want one that comes with 24 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 Joule Cyclone Air 150L Direct and the Telford Tempest 170 Direct?
The Telford Tempest 170 Direct comes with 24 years more warranty. The Joule Cyclone Air 150L Direct is a direct unvented hot water cylinder, 150 litres; the Telford Tempest 170 Direct is a direct unvented hot water cylinder, 170 litres.
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