Head to head
Telford Tempest 300 Indirect vs Vaillant ecoTEC Pro 24kW combi
The Telford Tempest 300 Indirect is a indirect unvented hot water cylinder, 300 litres. The Vaillant ecoTEC Pro 24kW combi is a gas combi boiler, 23.4 kw hot water output.
Last reviewed 13 September 2026
Specifications side by side
| Telford Tempest 300 Indirect | Vaillant ecoTEC Pro 24kW combi | |
|---|---|---|
| Dimensions | 1750 mm high x 580 mm diameter | 720 x 440 x 338 mm |
| Weight | 61 kg | 38 kg |
| Warranty | Lifetime guarantee on the body with annual service, 2 year component guarantee | 2 years standard, 7 years with Vaillant Advance registration |
| Capacity | 300 litres | - |
| Material | 2304 duplex stainless steel | - |
| Relief valve setting | 7 bar / 90C | - |
| Immersion heater | 3kW, 240V single phase, included | - |
| Hot water output | - | 23.4 kW |
| Central heating output | - | 24.8 kW |
| ErP class | - | A |
| Seasonal efficiency | - | 93% |
| Hot water flow rate | - | 9.6 litres per minute |
Sources: Telford Tempest 300 Indirect, Vaillant ecoTEC Pro 24kW 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 Pro 24kW combi if...
A gas combi boiler with 23.4 kW of hot water output, sized for a flat or small house with one bathroom. It delivers about 9.6 litres per minute of hot water, which decides how well a shower runs while a tap is on. Warranty: 2 years standard, 7 years with Vaillant Advance registration. Seasonal efficiency is 93%.
Full ecoTEC Pro 24kW combi specifications →Common questions
What is the difference between the Telford Tempest 300 Indirect and the Vaillant ecoTEC Pro 24kW combi?
The Telford Tempest 300 Indirect is a indirect unvented hot water cylinder, 300 litres; the Vaillant ecoTEC Pro 24kW combi is a gas combi boiler, 23.4 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.