Type 1 buildings place higher hygiene demands on the drinking water installation. Due to possibly longer unoccupied periods in individual rooms or residential units, incidents of stagnation often occur in the piping system.

This can have a negative effect on other rooms or residential units which are in use such as in hotels, hospitals and retirement homes. Especially in public buildings and facilities, the maintenance of the water quality is paramount. It is the express responsibility of the planner, installer and operator to fulfil this duty.

In hotels, for example, a Viega cistern can be installed locally in each room, equipped with a Visign for Care actuating panel with Viega Hygiene+ flushing function. In this way, the rooms are equipped with an intelligent electronic flushing device which is regulated as per demand and volume, which ensures periodical flushing when the room is not used. As soon as a room is used and water is extracted from the system again as a result, the system registers this and the automatic flushing stops.

With Type 1 buildings, flushing measures that are coordinated as per demand and volume are wise as these work in an automated way which conserves resources:

• When used regularly, no mandatory flush occurs.
• The flush programmes recognise interruptions in use and flush the pre-set volume of water in the pre-stored in the pipes on the storey.
• The water quality is maintained, drinking and waste water costs are kept to a minimum.