Harmoni 50 is an electronic programmable timer thermostat used for controlling electrical underfloor heating elements. The thermostat is designed for fixed installation only. It can be used for both direct heating of the entire room & for comfort heating of the floor. The Harmoni 50 incorporates the latest technology ensuring total control from the initial setup. This stylish cutting edge thermostat uses pulse width modulation with optimum start & optimum end programming as well as open window detection to guarantee extremely high temperature control accuracy, ensuring the Harmoni 50 is one of the most efficient underfloor heating controls available. Easy setup wizard Intuitive touch screen operation Energy saving Stylish modern design Perfect alternative to the DEVIreg Touch Programmable Thermostats & can be used with all DEVI products. 5 Year warranty