Head to head
Joule Cyclone Air 150L Direct vs Vaillant ecoFIT pure 835 35kW combi
The Vaillant ecoFIT pure 835 35kW combi comes with 9 years more warranty.
Last reviewed 13 September 2026
Key differences
- Warranty: the Vaillant ecoFIT pure 835 35kW combi comes with 9 years more warranty.
Specifications side by side
| Joule Cyclone Air 150L Direct | Vaillant ecoFIT pure 835 35kW combi | |
|---|---|---|
| Dimensions | 1196 x 540 x 540 mm (H x W x D) | 700 x 390 x 295 mm |
| Warranty | 1 year manufacturer's warranty | 10 years when installed by Vaillant Advance installer |
| Capacity | 150 litres | - |
| Heat-up time | 57 minutes (full tank, 6kW immersion) | - |
| Immersion heater | 6kW (2 x 3kW) | - |
| Hot water output | - | 35 kW |
| Central heating output | - | 26.7 kW |
| ErP class | - | A |
| Seasonal efficiency | - | 94% |
| Weight | - | 33 kg |
| Hot water flow rate | - | 14.1 litres per minute |
Sources: Joule Cyclone Air 150L Direct, Vaillant ecoFIT pure 835 35kW combi. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the Cyclone Air 150L Direct if...
A 150 litre direct unvented cylinder from Joule's Cyclone range, heated by twin immersion elements rather than a boiler or heat pump coil. It suits a property with electric-only heating or a holiday let, reheating a full tank in around 57 minutes.
Full Cyclone Air 150L Direct specifications →Buy or hire the ecoFIT pure 835 35kW combi if...
- you want one that comes with 9 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 14.1 litres per minute of hot water, which decides how well a shower runs while a tap is on. Warranty: 10 years when installed by Vaillant Advance installer. Seasonal efficiency is 94%.
Full ecoFIT pure 835 35kW combi specifications →Common questions
What is the difference between the Joule Cyclone Air 150L Direct and the Vaillant ecoFIT pure 835 35kW combi?
The Vaillant ecoFIT pure 835 35kW combi comes with 9 years more warranty. The Joule Cyclone Air 150L Direct is a direct unvented hot water cylinder, 150 litres; the Vaillant ecoFIT pure 835 35kW combi is a gas combi boiler, 35 kW hot water output.
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