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Because an unvented cylinder takes its water direct from the mains supply. You then benefit from the mains pressure hot water to match the cold water, hence why you are then able to have a power shower due to the enhanced flow rates! This means that the sealed hot water cylinder is fed directly by the cold water mains.

Gledhill require you to have your cylinder serviced every 12 months by a competent service engineer or you can request Gledhill to undertake this for you.

Indirect cylinders are the opposite of direct. They do not heat the water directly. The main provider for heating the water inside the cylinder comes from an external source. ... The water from the gas boiler is heated up, then sent around a coil that runs through the indirect cylinder, whic h in turn heats the water up.

The main difference between a vented and unvented water storage cylinder is that an unvented hot water cylinder takes its water supply directly from the mains. You can get hot water out of an unvented cylinder at a much better pressure than a traditional vented cylinder as it is pressurised.