A heater is 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). Heaters exists for all states of matter, including solids, liquids and gases. The opposite of a heater (for warmth) is an air cooler (for cold) used to keep the user cooler than the temperature originally surrounding them. Types of heatersAir preheaterAir heaterBlock heaterCathode heaterCentral heate… (More on Heater)