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Unvented Hot Water Cylinders

Unvented domestic hot water systems use water direct from the incoming supply and do not require a cold water storage tanks. They have been common use in countries throughout the world for many years and are now gaining popularity in the UK. Unvented cylinders generally provide very good flow characteristics and the pressure balance with cold water supply makes them particularly attractive for showers.

Building regulations in the united kingdom require that the authority responsible for building control is notified before an unvented cylinder of over 15 litres capacity is installed.

All installations must be carried out by a “ competent person “ and all cylinders
must be on the approved list of the British Board of Agrement.