System boilers are generally installed for homes with two or more baths. System boilers are pressurised with mains water and are accompanied with either a separate open vented or an unvented cylinder, usually situated in the airing cupboard.
Rather than trying to heat a lot of water instantly they can be set to heat a larger volume of water indirectly. Vented cylinders have a tank above the cylinder in the airing cupboard or loft and rely on gravity to supply the hot water. Whereas un-vented cylinders are mains cold water pressure fed. The size of the tank is usually designed around how many bath and shower rooms the property has.
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