In a direct-fired gas water heater, the heat source is a flame burning on the bottom of the water heater. Air enters the combustion chamber, integrates with the fuel, and the mixture is sparked. Heat is then moved to the water with metal surface areas at the bottom of the tank. The vent pipe, an exhaust pipe which carries the by-products of combustion to the outside, also serves as a heat exchanger. This pipe is typically surrounded by the water containment tank, and commonly consists of baffles to slow the escape of these gases with the vent, hence allowing 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 Salt Lake City.
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