The most commonly found type of water heater, in which a fuel is burned + heat is transferred to the water. For all fuel sources but electricity, a source of combustion air is required; the combustion gases are sent up a flue. A directly fired water heater may have integral or separate storage tanks.

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1. The most commonly found type of water heater, in which a fuel is burned + heat is transferred to the water. For all fuel sources but electricity, a source of combustion air is required; the combustion gases are sent up a flue. A directly fired water heater may have integral or separate storage tanks.