- If you are cold, try doing a little exercise before turning on the heater.
A "heater" is a device or appliance designed to generate and emit heat. It is used to warm up an enclosed space, such as a room in a house, an office, or a vehicle. For example, in cold winter months, people use electric heaters or gas heaters to make their living rooms more comfortable. There are different types of heaters, including space heaters for small areas, central heating systems that warm an entire building, and water heaters which heat water for domestic use like bathing and washing.