Heater

A thermostat is a device that automatically regulates heating or cooling appliances in response to temperature changes. It activates switches that control the equipment when the temperature reaches or falls below a certain pre-set temperature level. A very convenient temperature-sensing device, it allows ovens, air-conditioners and heating or cooling systems to function without human intervention. This is pretty useful especially if a person is sleeping and does not need to get up to re-set the equipment. Thermostats are good for saving energy and use a variety of sensors such as bi-metallic mechanical or electrical sensors, expanding wall pellets or electronic semiconductor devices.