Floors in the sanitary facilities are heated; the heating system includes the installed thermostat and floor sensors and provides heating at any time, when apartment owners wish this. A heating mat 150 W/m², S = 2.0 m², S = 2.5 m², S = 3.0 m², S = 3.5 m², S = 4.0 m² and a heating cable L = 10 m, 230 V will be used.