Head to head
Joule Cyclone Air 150L Direct vs Telford Tempest 300 Indirect
The Telford Tempest 300 Indirect comes with 1 year more warranty.
Last reviewed 13 September 2026
Key differences
- Warranty: the Telford Tempest 300 Indirect comes with 1 year more warranty.
Specifications side by side
| Joule Cyclone Air 150L Direct | Telford Tempest 300 Indirect | |
|---|---|---|
| Capacity | 150 litres | 300 litres |
| Dimensions | 1196 x 540 x 540 mm (H x W x D) | 1750 mm high x 580 mm diameter |
| Immersion heater | 6kW (2 x 3kW) | 3kW, 240V single phase, included |
| Warranty | 1 year manufacturer's warranty | Lifetime guarantee on the body with annual service, 2 year component guarantee |
| Heat-up time | 57 minutes (full tank, 6kW immersion) | - |
| Weight | - | 61 kg |
| Material | - | 2304 duplex stainless steel |
| Relief valve setting | - | 7 bar / 90C |
Sources: Joule Cyclone Air 150L Direct, Telford Tempest 300 Indirect. 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 300 Indirect if...
- you want one that comes with 1 year more warranty
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 Joule Cyclone Air 150L Direct and the Telford Tempest 300 Indirect?
The Telford Tempest 300 Indirect comes with 1 year more warranty. The Joule Cyclone Air 150L Direct is a direct unvented hot water cylinder, 150 litres; the Telford Tempest 300 Indirect is a indirect unvented hot water cylinder, 300 litres.
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