Vented Hot Water Cylinders

Vented hot water cylinder are gravity-fed from a cold water cistern tank, usually in the loft space of a property. The cold water tank is used to let trapped air to escape as well as acting as an expansion tank to accommodate the expansion of hot water. Because of this, a vented cylinder does not require the addition of an expansion vessel like the unvented cylinder. The cold water is either heated directly from an immersion heater within the cylinder or indirectly through the central heating boiler. Depending on the heating method you have a choice of an indirect vented hot water cylinder or a direct vented cylinder.