Head to head
Telford Tempest 300 Indirect vs Vaillant ecoTEC plus 835 35kW combi
The Vaillant ecoTEC plus 835 35kW combi comes with 8 years more warranty.
Last reviewed 13 September 2026
Key differences
- Warranty: the Vaillant ecoTEC plus 835 35kW combi comes with 8 years more warranty.
Specifications side by side
| Telford Tempest 300 Indirect | Vaillant ecoTEC plus 835 35kW combi | |
|---|---|---|
| Dimensions | 1750 mm high x 580 mm diameter | 720 x 440 x 372 mm |
| Warranty | Lifetime guarantee on the body with annual service, 2 year component guarantee | 10 years with Vaillant Advance Boiler Protection Kit |
| Capacity | 300 litres | - |
| Weight | 61 kg | - |
| Material | 2304 duplex stainless steel | - |
| Relief valve setting | 7 bar / 90C | - |
| Immersion heater | 3kW, 240V single phase, included | - |
| Hot water output | - | 35 kW |
| Central heating output | - | 32.8 kW |
| ErP class | - | A |
| Seasonal efficiency | - | 94% |
| Hot water flow rate | - | 14.3 litres per minute |
Sources: Telford Tempest 300 Indirect, Vaillant ecoTEC plus 835 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 ecoTEC plus 835 35kW combi if...
- you want one that comes with 8 years more warranty
A gas combi boiler with 35 kW of hot water output, sized for a larger house with two bathrooms. It delivers about 14.3 litres per minute of hot water, which decides how well a shower runs while a tap is on. Warranty: 10 years with Vaillant Advance Boiler Protection Kit. Seasonal efficiency is 94%.
Full ecoTEC plus 835 35kW combi specifications →Common questions
What is the difference between the Telford Tempest 300 Indirect and the Vaillant ecoTEC plus 835 35kW combi?
The Vaillant ecoTEC plus 835 35kW combi comes with 8 years more warranty. The Telford Tempest 300 Indirect is a indirect unvented hot water cylinder, 300 litres; the Vaillant ecoTEC plus 835 35kW combi is a gas combi boiler, 35 kW hot water output.
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