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