A heater's any object that emits heat or causes another body to achieve a higher temperature. In a household or domestic setting, heaters are commonly used to generate heating (for example warmth). The opposite of a heater (for warmth)'s an air conditioner (air-con) used to keep the user cooler than the temperature originally surrounding them. Types of heaters Block heater Cathode heater Central heater Dielectric heater District heater Electric heater Convector heater Electric heat pump… (More on Heater)