Head to head
Joule Cyclone Air 150L Direct vs Viessmann Vitodens 100-W 35kW combi
The Viessmann Vitodens 100-W 35kW combi comes with 4 years more warranty.
Last reviewed 13 September 2026
Key differences
- Warranty: the Viessmann Vitodens 100-W 35kW combi comes with 4 years more warranty.
Specifications side by side
| Joule Cyclone Air 150L Direct | Viessmann Vitodens 100-W 35kW combi | |
|---|---|---|
| Dimensions | 1196 x 540 x 540 mm (H x W x D) | 700 x 400 x 360 mm |
| Warranty | 1 year manufacturer's warranty | 5 years |
| Capacity | 150 litres | - |
| Heat-up time | 57 minutes (full tank, 6kW immersion) | - |
| Immersion heater | 6kW (2 x 3kW) | - |
| Hot water output | - | 34.9 kW |
| Central heating output | - | 32 kW |
| ErP class | - | A |
| Seasonal efficiency | - | 98% |
| Weight | - | 35 kg |
| Hot water flow rate | - | 17 litres per minute |
Sources: Joule Cyclone Air 150L 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 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 Vitodens 100-W 35kW combi if...
- you want one that comes with 4 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 Joule Cyclone Air 150L Direct and the Viessmann Vitodens 100-W 35kW combi?
The Viessmann Vitodens 100-W 35kW combi comes with 4 years more warranty. The Joule Cyclone Air 150L Direct is a direct unvented hot water cylinder, 150 litres; the Viessmann Vitodens 100-W 35kW combi is a gas combi boiler, 34.9 kW hot water output.
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