Electronic room temperature controller with automatic night-time reduction for combination with radiator thermostat valves, can be switched between daily and weekly programs, can be programmed every 5 minutes or 30 minutes, shortest switching time for weekly program 2 hours, night temperature adjustable from +10°C ... 30°C, operating mode selector switch, frost protection 6°C, party switch, control display, thermal feedback and operating point adjustable, housing color white, 1 changeover contact