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Anatomy of a Gas Water Heater (Tank type)

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Exhaust Flue
Flue Vent

Flue Vent

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Gas Combustion Exhaust Flue
The exhaust flue serves two purposes. It exhausts combustion gasses from the burner and it serves as a type of heat exchanger helping to heat the water in the storage tank. The flue must be properly exhausted to the outside and there are specific code requirements for the type of flue construction and acceptable details.

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