Unvented cylinders are mains pressure hot water storage systems that provide a highly efficient way of storing and distributing domestic hot water at mains pressure throughout your home heated via a element in the cylinder only (DIRECT) or via a boiler feeding a coil in the cylinder (INDIRECT) with immersion as a backup.

These cylinders are not open to the atmosphere, unlike open vented cylinders which are open to the atmosphere via the cylinder's vent pipe and the cylinder's cold feed pipe from the cold water storage cistern/tank.

These mains pressure cylinders provide quicker heat recovery than the low pressure open vented cylinder, i.e, it takes less time to heat up.

Because water is supplied from the mains supply and not from a cold water storage cistern/tank, the flow rate and water pressure from a unvented cylinder at the outlets (taps/faucets shower heads) is much greater than from the storage fed open vented cylinder.

Showed price are for supply and install into your old cylinder location.