Head to head
Joule Cyclone 200L Indirect vs Vaillant ecoFIT pure 835 35kW combi
The Joule Cyclone 200L Indirect is a indirect unvented hot water cylinder, 200 litres. The Vaillant ecoFIT pure 835 35kW combi is a gas combi boiler, 35 kw hot water output.
Last reviewed 13 September 2026
Specifications side by side
| Joule Cyclone 200L Indirect | Vaillant ecoFIT pure 835 35kW combi | |
|---|---|---|
| Dimensions | 1490 mm high x 540 mm diameter | 700 x 390 x 295 mm |
| Weight | 47 kg | 33 kg |
| Capacity | 200 litres | - |
| Material | Duplex stainless steel | - |
| ErP rating | C | - |
| Hot water output | - | 35 kW |
| Central heating output | - | 26.7 kW |
| ErP class | - | A |
| Seasonal efficiency | - | 94% |
| Warranty | - | 10 years when installed by Vaillant Advance installer |
| Hot water flow rate | - | 14.1 litres per minute |
Sources: Joule Cyclone 200L Indirect, 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 200L Indirect if...
A 200 litre indirect cylinder from Joule's Cyclone range, built in duplex stainless steel with a high recovery coil for use with a boiler or heat pump. It suits a three or four-bed house with a standard hot water demand.
Full Cyclone 200L Indirect specifications →Buy or hire the ecoFIT pure 835 35kW combi if...
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 200L Indirect and the Vaillant ecoFIT pure 835 35kW combi?
The Joule Cyclone 200L Indirect is a indirect unvented hot water cylinder, 200 litres; the Vaillant ecoFIT pure 835 35kW combi is a gas combi boiler, 35 kW hot water output.
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