Temperature controller, normally open, with central piece, time-controlled K.1 polar white, glossy. Temperature controller, normally open, with central piece, time-controlled, adapts the heating requirement to individual lifestyle habits by regulating the room temperature depending on the time and day of the week (program), with print. For heating or cooling operation. For room and underfloor heating, with integrated temperature sensor, for underfloor heating, control via room and/or external temperature controller possible, with additional connection for external floor temperature/remote sensor, large, backlit display with text display, user languages adjustable: German, English, Dutch or French, max. 9 switching times per weekday, 3 preset time programs individually adjustable, programmable with detached control panel, with manual/automatic mode switchover, with automatic summer/winter time switchover (can be switched off), temperature control range adjustable, with manual temperature value adjustment, timer for hourly temperature changes, holiday program with date activation, operating hours counter or energy consumption display adjustable, with valve protection function, with frost protection function, with access protection, PWM or 2-point (on/off) control method selectable, PWM cycle time and hysteresis (with two-point control) adjustable, type of actuator (normally closed/open) adjustable, with self-learning heating curve, without spreading claws, with screw terminals, neutral conductor required.