Gas-fired heaters are appliances that use natural gas or propane to generate heat for residential or commercial spaces. They work by burning gas to produce warmth, which is then distributed through ducts or radiators. These heaters are popular for their efficiency and ability to provide consistent heating. These systems come in various types, including furnaces, boilers, and space heaters. Gas-fired heaters are often preferred for their lower operating costs compared to electric heaters. Regular maintenance is essential to ensure safety and optimal performance, as improper use can lead to issues like carbon monoxide buildup.