A building in which all or some of dwellings are connected to an installation delivering heat from a central source of its production as well as a boiler house in an individual building.

A central source of heating includes: a power plant, a heating plant, an off-site boiler house or a local boiler house in a multidwelling building also a building equipped with an on-site distributor type installation including a heating device.

• Dwelling fitted with (sanitary and technical) installations