Head to head
Joule Cyclone 200L Indirect vs Worcester Bosch Greenstar 4000 30kW combi
The Joule Cyclone 200L Indirect is a indirect unvented hot water cylinder, 200 litres. The Worcester Bosch Greenstar 4000 30kW combi is a gas combi boiler, 30 kw hot water output.
Last reviewed 13 September 2026
Specifications side by side
| Joule Cyclone 200L Indirect | Worcester Bosch Greenstar 4000 30kW combi | |
|---|---|---|
| Dimensions | 1490 mm high x 540 mm diameter | 710 x 400 x 310 mm |
| Weight | 47 kg | 32.3 kg |
| Capacity | 200 litres | - |
| Material | Duplex stainless steel | - |
| ErP rating | C | - |
| Hot water output | - | 30 kW |
| Central heating output | - | 30 kW |
| ErP class | - | A |
| Seasonal efficiency | - | 94% |
| Warranty | - | 10 years |
| Hot water flow rate | - | 12.3 litres per minute |
Sources: Joule Cyclone 200L Indirect, Worcester Bosch Greenstar 4000 30kW 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 Greenstar 4000 30kW combi if...
A gas combi boiler with 30 kW of hot water output, sized for a three-bed house with one or two bathrooms. It delivers about 12.3 litres per minute of hot water, which decides how well a shower runs while a tap is on. Warranty: 10 years. Seasonal efficiency is 94%.
Full Greenstar 4000 30kW combi specifications →Common questions
What is the difference between the Joule Cyclone 200L Indirect and the Worcester Bosch Greenstar 4000 30kW combi?
The Joule Cyclone 200L Indirect is a indirect unvented hot water cylinder, 200 litres; the Worcester Bosch Greenstar 4000 30kW combi is a gas combi boiler, 30 kW hot water output.
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