Head to head
Telford Tempest 170 Direct vs Worcester Bosch Greenstar 5800i AW 7kW
The Telford Tempest 170 Direct is a direct unvented hot water cylinder, 170 litres. The Worcester Bosch Greenstar 5800i AW 7kW is a r290 monobloc air source heat pump, 7.97 kw heat output.
Last reviewed 13 September 2026
Specifications side by side
| Telford Tempest 170 Direct | Worcester Bosch Greenstar 5800i AW 7kW | |
|---|---|---|
| Dimensions | 1200 mm high x 510 mm diameter (approx.) | 800 x 1100 x 540 mm (H x W x D) |
| Weight | 40 kg empty, 208 kg full | 143 kg |
| Capacity | 170 litres | - |
| Immersion heater | 2 x 3kW, 240V single phase | - |
| Max inlet pressure | 3 bar (inlet control group) | - |
| Warranty | Lifetime guarantee on the cylinder (25 years internal), 2 years on components | - |
| Heat output | - | 7.97 kW at 7/35C |
| SCOP | - | 4.54 (MCS, 35C flow) |
| Refrigerant | - | R290 (propane) |
| Sound pressure | - | 42 dB(A) |
| Max flow temperature | - | 75C |
Sources: Telford Tempest 170 Direct, Worcester Bosch Greenstar 5800i AW 7kW. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the Tempest 170 Direct if...
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 →Buy or hire the Greenstar 5800i AW 7kW if...
The larger 5800i AW unit, for a slightly bigger house than the 5kW model while sharing the same cabinet size and 42 dB(A) sound rating. Its R290 refrigerant and 75C flow temperature suit a radiator-based retrofit.
Full Greenstar 5800i AW 7kW specifications →Common questions
What is the difference between the Telford Tempest 170 Direct and the Worcester Bosch Greenstar 5800i AW 7kW?
The Telford Tempest 170 Direct is a direct unvented hot water cylinder, 170 litres; the Worcester Bosch Greenstar 5800i AW 7kW is a r290 monobloc air source heat pump, 7.97 kW heat output.
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