In a direct-fired gas water heater, the heat source is a flame burning on the bottom of the water heater. Air gets in the combustion chamber, incorporates with the fuel, and the mixture is stirred up. Heat is then transferred to the water through metal surfaces at the bottom of the tank. The vent pipe, an exhaust pipe which holds the by-products of combustion to the exterior, likewise serves as a heat exchanger. This pipe is usually surrounded by the water containment tank, and frequently includes baffles to slow the escape of these gases with the vent, thus allowing more time for heat to be moved to the water around the pipe.
Energy is lost in the transfer of heat from the flame to the water, and some heat is lost up the flue suggests Gas Water Heater Repair Chattanooga.
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