Head to head
Joule Cyclone Air 150L Direct vs Worcester Bosch Greenstar 5800i AW 5kW
The Joule Cyclone Air 150L Direct is a direct unvented hot water cylinder, 150 litres. The Worcester Bosch Greenstar 5800i AW 5kW is a r290 monobloc air source heat pump, 6.80 kw heat output.
Last reviewed 13 September 2026
Specifications side by side
| Joule Cyclone Air 150L Direct | Worcester Bosch Greenstar 5800i AW 5kW | |
|---|---|---|
| Dimensions | 1196 x 540 x 540 mm (H x W x D) | 800 x 1100 x 540 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 | - | 6.80 kW at 7/35C |
| SCOP | - | 4.53 (MCS, 35C flow) |
| Refrigerant | - | R290 (propane) |
| Sound pressure | - | 42 dB(A) |
| Weight | - | 143 kg |
| Max flow temperature | - | 75C |
Sources: Joule Cyclone Air 150L Direct, Worcester Bosch Greenstar 5800i AW 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 Greenstar 5800i AW 5kW if...
Worcester Bosch's entry-size 5800i AW, using the natural refrigerant R290 and reaching a 75C flow temperature for existing radiator systems. It is marketed as one of the quieter units in this size at 42 dB(A) sound pressure.
Full Greenstar 5800i AW 5kW specifications →Common questions
What is the difference between the Joule Cyclone Air 150L Direct and the Worcester Bosch Greenstar 5800i AW 5kW?
The Joule Cyclone Air 150L Direct is a direct unvented hot water cylinder, 150 litres; the Worcester Bosch Greenstar 5800i AW 5kW is a r290 monobloc air source heat pump, 6.80 kW heat output.
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