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A system boiler heats your central heating system directly and produces hot water for your cylinder. Although both system boilers and regular boilers work on the principle of stored hot water, a system boiler is different in two important ways. Firstly, many of the components of the heating and hot water system are built into the boiler itself â€“ making it quicker and easier to install. Secondly, it doesnâ€™t need a feed and expansion tank in the loft. Mr Central Heating stocks a wide range of Worcester Bosch Greenstar system boilers in varying outputs to meet your needs.