What Are the Parts of a Gas Furnace?


Quick Answer

Most gas furnaces contain five main parts, all of which are essential to the heater functioning properly. The components include a burner, heat exchanger, ductwork, a flue or vent pipe and an ignitor to start the process.

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Full Answer

The ignitor acts as the first function, as it simply lights the gas. To light, the burner then transfers the gas to where it needs to go to be ultimately burned and distributed for heat. After the fuel is burned, the heat exchanger then takes it from the burner to the air distribution system. Once it enters this system, the heat is distributed throughout the ductwork, so that it can enter into other parts of the home or apartment. After this whole process, exhaust and other by-products are created and must be released outside of the home. This is done using either a flue or vent pipe, so that those hazardous gases don’t get into your home. Many old furnaces also still use a pilot light that stays lit to ensure the heater lights quickly, but they are not as efficient as new ones and can be somewhat wasteful. The more modern furnaces now include what is called an inducer to draw in more air to the heater, and an electronic ignition system instead of the old wasteful pilot lights.

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