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, integrates 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 carries the by-products of combustion to the outside, also works as a heat exchanger. This pipe is usually surrounded by the water containment tank, and often consists of baffles to slow the escape of these gases with the vent, hence enabling even 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 Los Angeles.
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