Type 0 indicates all buildings in which there is rarely an interruption in use, for example residential apartment buildings.

Of course, short periods of stagnation also occur here in the drinking water system, caused by short periods of non-occupation such as the absence of the user (holidays) or when tenants are changing. However, these can safely and easily be remedied by a short flushing of the system by the user on his/her return. In Type 0 buildings, there are no increased requirements regarding hygienic conditions.

• When properly planned, designed and operated, Type 0 buildings require no automatic flushing, although it may be advantageous in larger properties with guest rooms.
  
  
• In the upkeep or renovation of Type 0 buildings, an evaluation of the existing conditions is necessary (temperature, determination of the amount and frequency of water extraction at the individual points, determination of the water quality through sampling). The extent of the renovation can be based on the information gathered.

With Type 0 buildings, professional planning, design and operation is normally adequate: by observing the actual pressure looses of, for example, connectors, valves and small simultaneous factors, pipe length and volumes can be minimized. Seldom used, but desired extraction points are looped-in.