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Anatomy of a Gas Water Heater (Tank type)

By Bob Formisano, About.com

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Water Supply and Discharge

Cold Water Supply
Cold water is provided to the tank by a cold water supply line and controlled by a shutoff valve. It is important to know where the water supply shut off valve is located so maintenance can be performed on the tank.

Hot Water Discharge
This is the business end of the hot water heater and the hot water line is what supplies all your sinks, tubs, showers and appliance needing hot water.

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