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Vented systems are known as ‘gravity fed hot water systems’. Vented hot water cylinders (also called open-vented cylinders) need to be supplied by a large tank of cold water which is kept in the loft. The natural pull of gravity carries this water via a vent pipe down to the hot water cylinder which heats the water. Vented cylinders rely on gravity and the height of the cold water tank dictates the pressure. This means that the cold water tank should be placed in the loft. As the water is heated it expands, but the presence of the vent pipe and tank in the loft provides an escape route for the excess. If you are looking to install a hot water cylinder in a loft or a place with limited head space, a horizontal vented cylinder may be a more suitable solution. For more detailed information on vented cylinders, click here.