This White-Rodgers Electronic Programmable Baseboard Thermostat works with fan forced and baseboard heaters. it works with either 240v or 120v the large display has a back light which comes on when you touch one of the large soft-touch buttons also easily provide user sensory feedback. This thermostat saves electrical consumption by controlling the power to the baseboard in 4 stages of heat at 25% increments, this also allows excellent temperature comfort in the home. Precise temperature control with adjustable temperature limits. Fast installations. Easy wire connections. This thermostat is heat only. White-Rodgers is a business of Emerson, the world's leading provider of heating, ventilation, air conditioning, and refrigeration solutions for residential, industrial, and commercial applications.