Universal flush-mounted temperature controller for time-dependent individual room or floor temperature control for electric and hot water heating systems (actuators normaly closed). The device can be used as a room temperature controller (optionally also with an optional external room sensor), with an optional remote sensor as a room temperature controller with floor monitoring or as a floor temperature controller. This clock thermostat has a weekly timer with individually adjustable programs (factory setting to „normal“ daily routines). Easiest handling through intuitive operation, cost optimization through time-controlled regulation to the desired temperatures. Illuminated, graphics-capable display. Convenient installation thanks to free wiring of the plug-in screw terminals.