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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.
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.