Boiler Types > System Boiler

An example system boilerAn unvented cylinder

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.

They are most suitable if:

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