Head to head
Joule Cyclone Air 150L Direct vs Vaillant aroTHERM plus 5kW
The Joule Cyclone Air 150L Direct is a direct unvented hot water cylinder, 150 litres. The Vaillant aroTHERM plus 5kW is a r290 monobloc air source heat pump, 5 kw heat output.
Last reviewed 13 September 2026
Specifications side by side
| Joule Cyclone Air 150L Direct | Vaillant aroTHERM plus 5kW | |
|---|---|---|
| Dimensions | 1196 x 540 x 540 mm (H x W x D) | 965 x 1100 x 450 mm (H x W x D) |
| 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 | - | 5 kW |
| SCOP | - | up to 5.03 |
| Refrigerant | - | R290 (propane), low GWP |
| Sound power | - | 53 dB(A) at A7/W35, 58 dB(A) at A7/W55 |
| Weight | - | 128 kg (operating) |
| Max flow temperature | - | 75C |
Sources: Joule Cyclone Air 150L Direct, Vaillant aroTHERM plus 5kW. 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 aroTHERM plus 5kW if...
The smallest aroTHERM plus, sized for a well-insulated flat or small house. It uses the natural refrigerant R290 rather than an F-gas, and reaches a 75C flow temperature, which helps it work with existing radiators on a retrofit job.
Full aroTHERM plus 5kW specifications →Common questions
What is the difference between the Joule Cyclone Air 150L Direct and the Vaillant aroTHERM plus 5kW?
The Joule Cyclone Air 150L Direct is a direct unvented hot water cylinder, 150 litres; the Vaillant aroTHERM plus 5kW is a r290 monobloc air source heat pump, 5 kW heat output.
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