A baseboard heater thermostat is an electronic device that senses room temperature and adjusts the output of the connected heater accordingly. The system works to maintain temperature in a room as closely as possible to a pre-set point.
The thermostat works to control temperature by switching on or off components in the baseboard heater. Thermostats use various types of sensors to detect temperature. Electric baseboard heaters are long, low units that run along the floor against a wall and give off radiant heat. They use electric coils to produce heat and rely on natural air flow to heat the space.
As of August 2014, baseboard heater thermostats range in price from about $12 to $42 through various retailers. They can be connected to the heater or mounted on a wall.