Head to head
Telford Tempest 170 Direct vs Worcester Bosch Greenstar 4000 25kW combi
The Telford Tempest 170 Direct comes with 15 years more warranty.
Last reviewed 13 September 2026
Key differences
- Warranty: the Telford Tempest 170 Direct comes with 15 years more warranty.
Specifications side by side
| Telford Tempest 170 Direct | Worcester Bosch Greenstar 4000 25kW combi | |
|---|---|---|
| Dimensions | 1200 mm high x 510 mm diameter (approx.) | 710 x 400 x 310 mm |
| Weight | 40 kg empty, 208 kg full | 32.0 kg |
| Warranty | Lifetime guarantee on the cylinder (25 years internal), 2 years on components | 10 years |
| Capacity | 170 litres | - |
| Immersion heater | 2 x 3kW, 240V single phase | - |
| Max inlet pressure | 3 bar (inlet control group) | - |
| Hot water output | - | 25 kW |
| Central heating output | - | 25 kW |
| ErP class | - | A |
| Seasonal efficiency | - | 94% |
| Hot water flow rate | - | 10.5 litres per minute |
Sources: Telford Tempest 170 Direct, Worcester Bosch Greenstar 4000 25kW combi. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the Tempest 170 Direct if...
- you want one that comes with 15 years more warranty
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 4000 25kW combi if...
A gas combi boiler with 25 kW of hot water output, sized for a flat or small house with one bathroom. It delivers about 10.5 litres per minute of hot water, which decides how well a shower runs while a tap is on. Warranty: 10 years. Seasonal efficiency is 94%.
Full Greenstar 4000 25kW combi specifications →Common questions
What is the difference between the Telford Tempest 170 Direct and the Worcester Bosch Greenstar 4000 25kW combi?
The Telford Tempest 170 Direct comes with 15 years more warranty. The Telford Tempest 170 Direct is a direct unvented hot water cylinder, 170 litres; the Worcester Bosch Greenstar 4000 25kW combi is a gas combi boiler, 25 kW hot water output.
GetBrent is an independent directory and is not a dealer for, nor affiliated with, either manufacturer. Model and brand names are the trademarks of their owners.