Room controller for time and room temperature dependent control of a heating system, digital time switch (daily program) by 0.5 hour raster with easy graphic programming (bar chart, 4 individual temperature levels adjustable, wall mounting, economy reduction with frost protection, holiday function, party function, input for heating system, input for heating systemr TeleSWITCH telephone remote switch, 2-point control, 3-wire interface 230 V, accessory VRC-K (300750) required for gas boiler