Head to head
Telford Tempest 170 Direct vs Viessmann Vitodens 100-W 35kW combi
The Telford Tempest 170 Direct comes with 20 years more warranty.
Last reviewed 13 September 2026
Key differences
- Warranty: the Telford Tempest 170 Direct comes with 20 years more warranty.
Specifications side by side
| Telford Tempest 170 Direct | Viessmann Vitodens 100-W 35kW combi | |
|---|---|---|
| Dimensions | 1200 mm high x 510 mm diameter (approx.) | 700 x 400 x 360 mm |
| Weight | 40 kg empty, 208 kg full | 35 kg |
| Warranty | Lifetime guarantee on the cylinder (25 years internal), 2 years on components | 5 years |
| Capacity | 170 litres | - |
| Immersion heater | 2 x 3kW, 240V single phase | - |
| Max inlet pressure | 3 bar (inlet control group) | - |
| Hot water output | - | 34.9 kW |
| Central heating output | - | 32 kW |
| ErP class | - | A |
| Seasonal efficiency | - | 98% |
| Hot water flow rate | - | 17 litres per minute |
Sources: Telford Tempest 170 Direct, Viessmann Vitodens 100-W 35kW 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 20 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 Vitodens 100-W 35kW combi if...
A gas combi boiler with 34.9 kW of hot water output, sized for a larger house with two bathrooms. It delivers about 17 litres per minute of hot water, which decides how well a shower runs while a tap is on. Warranty: 5 years. Seasonal efficiency is 98%.
Full Vitodens 100-W 35kW combi specifications →Common questions
What is the difference between the Telford Tempest 170 Direct and the Viessmann Vitodens 100-W 35kW combi?
The Telford Tempest 170 Direct comes with 20 years more warranty. The Telford Tempest 170 Direct is a direct unvented hot water cylinder, 170 litres; the Viessmann Vitodens 100-W 35kW combi is a gas combi boiler, 34.9 kW hot water output.
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