Head to head
Joule Cyclone Air 150L Direct vs Viessmann Vitocal 150-A10
The Joule Cyclone Air 150L Direct is a direct unvented hot water cylinder, 150 litres. The Viessmann Vitocal 150-A10 is a r290 air source heat pump, 7.3 kw heat output.
Last reviewed 13 September 2026
Specifications side by side
| Joule Cyclone Air 150L Direct | Viessmann Vitocal 150-A10 | |
|---|---|---|
| Dimensions | 1196 x 540 x 540 mm (H x W x D) | 920 x 450 x 360 mm (H x W x D) (indoor unit); 841 x 1144 x 600 mm (H x W x D, single fan) (outdoor unit) |
| Capacity | 150 litres | - |
| Heat-up time | 57 minutes (full tank, 6kW immersion) | - |
| Immersion heater | 6kW (2 x 3kW) | - |
| Warranty | 1 year manufacturer's warranty | - |
| Heat output | - | 7.3 kW at A7/W35 |
| COP | - | 4.7-5.0 at A7/W35 |
| Refrigerant | - | R290 (propane), GWP 0.02 |
| Sound power | - | 51 dB(A) assessed total at A7/W55 |
| Weight | - | 162 kg (single fan) (outdoor unit) |
| Max flow temperature | - | 70C down to -10C outdoor |
Sources: Joule Cyclone Air 150L Direct, Viessmann Vitocal 150-A10. 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 Vitocal 150-A10 if...
A Vitocal 150-A monobloc-style split heat pump using the natural refrigerant R290, rated at 7.3kW and reaching a 70C flow for boiler-replacement work. Viessmann-trained installers can extend the standard warranty on registration.
Full Vitocal 150-A10 specifications →Common questions
What is the difference between the Joule Cyclone Air 150L Direct and the Viessmann Vitocal 150-A10?
The Joule Cyclone Air 150L Direct is a direct unvented hot water cylinder, 150 litres; the Viessmann Vitocal 150-A10 is a r290 air source heat pump, 7.3 kW heat output.
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