A heater is a device used to generate warmth in a space, making it more comfortable during cold weather. It can operate using various energy sources, including electricity, gas, or oil. Heaters come in different types, such as central heating systems, space heaters, and radiators, each designed for specific heating needs. Heaters work by converting energy into heat, which is then distributed throughout a room or building. Some heaters use fans to circulate warm air, while others rely on radiant heat. Proper maintenance is essential for efficiency and safety, ensuring that heaters function effectively and reduce the risk of hazards like carbon monoxide poisoning.