Head to head
Telford Tempest 170 Direct vs Worcester Bosch Greenstar 5800i AW 5kW
The Telford Tempest 170 Direct is a direct unvented hot water cylinder, 170 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
| Telford Tempest 170 Direct | Worcester Bosch Greenstar 5800i AW 5kW | |
|---|---|---|
| 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 | - | 6.80 kW at 7/35C |
| SCOP | - | 4.53 (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 5kW. 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 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 Telford Tempest 170 Direct and the Worcester Bosch Greenstar 5800i AW 5kW?
The Telford Tempest 170 Direct is a direct unvented hot water cylinder, 170 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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