The Komodo Thermostat provides precision when using any thermostatically controlled heat source, and the On/Off Thermostats are guaranteed to maintain the required temperature to within 1 degree Celsius. How they work: The On/off stats are the least expensive and the most basic thermostat in the Komodo range and they regulate the temperature by switching the heater on and off. If the senor reads a temperature that is too warm, it switches the heater off. Too cold, it switches the heater on.