Heaters are devices designed to generate warmth in indoor spaces. They work by converting energy, usually from electricity or fuel, into heat. Common types of heaters include electric heaters, gas heaters, and radiant heaters. These devices are essential for maintaining comfortable temperatures during cold weather. Heaters can vary in size and efficiency, with some being portable and others installed as part of a central heating system. Safety features, such as automatic shut-off mechanisms, are important to prevent overheating. Regular maintenance is also recommended to ensure optimal performance and longevity of the heater.