Greenstar 4000 System Boilers
(10 products)System boilers are classed as a sealed system or closed system, which means they don't need a header tank in the loft to feed the cylinder and maintain water levels in the radiators. They work by pumping hot water around your central heating system and are designed, so that all of the major parts such as the pump, are pre-built into the boiler. Taking water directly from the mains water supply, meaning they don't need as much storage and also provides a more consistent flow rate. They are easy to install and also make servicing easier as well. They are economical to run, so have strong green credentials.
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