Head to head
Telford Tempest 300 Indirect vs Viessmann Vitodens 100-W 35kW combi
The Viessmann Vitodens 100-W 35kW combi comes with 3 years more warranty.
Last reviewed 13 September 2026
Key differences
- Warranty: the Viessmann Vitodens 100-W 35kW combi comes with 3 years more warranty.
Specifications side by side
| Telford Tempest 300 Indirect | Viessmann Vitodens 100-W 35kW combi | |
|---|---|---|
| Dimensions | 1750 mm high x 580 mm diameter | 700 x 400 x 360 mm |
| Weight | 61 kg | 35 kg |
| Warranty | Lifetime guarantee on the body with annual service, 2 year component guarantee | 5 years |
| Capacity | 300 litres | - |
| Material | 2304 duplex stainless steel | - |
| Relief valve setting | 7 bar / 90C | - |
| Immersion heater | 3kW, 240V single phase, included | - |
| 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 300 Indirect, 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 300 Indirect if...
A 300 litre indirect cylinder for a larger household or a property with high simultaneous hot water demand, part of Telford's Tempest range. Like the smaller direct model it carries a lifetime body guarantee when serviced annually.
Full Tempest 300 Indirect specifications →Buy or hire the Vitodens 100-W 35kW combi if...
- you want one that comes with 3 years more warranty
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 300 Indirect and the Viessmann Vitodens 100-W 35kW combi?
The Viessmann Vitodens 100-W 35kW combi comes with 3 years more warranty. The Telford Tempest 300 Indirect is a indirect unvented hot water cylinder, 300 litres; the Viessmann Vitodens 100-W 35kW combi is a gas combi boiler, 34.9 kW hot water output.
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