Ideal for those with limited available space, an unvented water cylinder is usually mounted inside an airing cupboard and eliminates the need for a cold water header tank. Thus it makes it the ideal choice for use in situations where no loft space is available. Such as, when installing a central heating system in an apartment.

Because this type of cylinder is refilled directly by the cold water main, the hot and cold water pressures become balanced. Meaning that there's less waiting around for the bath to fill up.

An unvented water cylinder is also more ecomonmical to use due to its improved insulation and gives faster warm-up times.