An "all-in-one" programmable thermostat for all electric underfloor heating applications where optimal comfort temperature and minimum energy consumption is required. The thermostat can be configured for control of floor temperature, room temperature or room temperature with floor temperature limit. In large applications exceeding 15 Amps, the UDG thermostat can be extended by adding USG power modules at 15 Amps each. The thermostat is supplied with a factory-set, 4-events-per-day-program for automatic comfort and set-back temperatures. The factory settings can be adjusted to suite your individual requirements. The programmable thermostat features an adaptive function allowing it to calculate when the heating must be switched on to ensure that the comfort temperature setting is reached at the required time. Programmed temperatures can be manually overridden at any time and the thermostat will automatically revert to the program temperature at the next scheduled event. The thermostat is supplied with a floor sensor that can be used for maximum temperature limit to comply with laminate and wood floor warranties.