Gas heater is a type of indoor heating device that is designed to provide warmth and comfort to residential or commercial spaces. It works by burning natural gas or propane to produce heat, which is then circulated through ducts or vents and into the living space.Gas heaters are available in a range of sizes and designs, including freestanding models, wall-mounted models, and central heating systems. They are often equipped with a thermostat or temperature control knob, allowing users to adjust the temperature of the living space to their desired level.