Head to head
Glow-worm Energy Combi 25C 25kW vs Telford Tempest 170 Direct
The Telford Tempest 170 Direct comes with 18 years more warranty.
Last reviewed 13 September 2026
Key differences
- Warranty: the Telford Tempest 170 Direct comes with 18 years more warranty.
Specifications side by side
| Glow-worm Energy Combi 25C 25kW | Telford Tempest 170 Direct | |
|---|---|---|
| Dimensions | 700 x 390 x 280 mm | 1200 mm high x 510 mm diameter (approx.) |
| Weight | 32 kg | 40 kg empty, 208 kg full |
| Warranty | 7 years | Lifetime guarantee on the cylinder (25 years internal), 2 years on components |
| Hot water output | 25.7 kW | - |
| Central heating output | 18 kW | - |
| ErP class | A | - |
| Seasonal efficiency | 94% | - |
| Hot water flow rate | 10.4 litres per minute | - |
| Capacity | - | 170 litres |
| Immersion heater | - | 2 x 3kW, 240V single phase |
| Max inlet pressure | - | 3 bar (inlet control group) |
Sources: Glow-worm Energy Combi 25C 25kW, Telford Tempest 170 Direct. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the Energy Combi 25C 25kW if...
A gas combi boiler with 25.7 kW of hot water output, sized for a flat or small house with one bathroom. It delivers about 10.4 litres per minute of hot water, which decides how well a shower runs while a tap is on. Warranty: 7 years. Seasonal efficiency is 94%.
Full Energy Combi 25C 25kW specifications →Buy or hire the Tempest 170 Direct if...
- you want one that comes with 18 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 →Common questions
What is the difference between the Glow-worm Energy Combi 25C 25kW and the Telford Tempest 170 Direct?
The Telford Tempest 170 Direct comes with 18 years more warranty. The Glow-worm Energy Combi 25C 25kW is a gas combi boiler, 25.7 kW hot water output; the Telford Tempest 170 Direct is a direct unvented hot water cylinder, 170 litres.
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.