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A System Boiler is very similar to a Regular Boiler, generating the heat for your central heating system (radiators) and hot water via cylinder. This hot water is stored in the hot water cylinder until it is needed, giving you a ready supply of hot water needed for your baths, taps and showers. Unlike a Regular Boiler, the System Boiler does not require a feed & expansion tank as the system is sedent and the water in it is raised above atmospheric pressure. This helps to save on space. If you have a System Boiler you will have a hot water cylinder and may also have a cold water cistern. You will not have a feed & expansion vessel.