Electronic thermostat for electric towel heaters based on fluid heat transfer. The ambient temperature is controlled by means of an external sensor. The SMART series has the heating element couples to the thermostat. The symmetry of the device enables both right and left side coupling to the towel heater. It is possible to choose between three predefined programs, as indicated in the guide for setting the operational times. The upper button selects the stand-by/antifreeze modes and the LEDs indicate the selected temperature (14-29°C). The lower button selects the operating mode that is also indicated by a corresponding LED. The side buttons increase or decrease the selected temperature.