Importance

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Abstract

A fuel-fired water heater has a tank which holds a reserve of water to be heated by a burner located in a sealed combustion chamber disposed under a bottom heat transfer wall of the tank. A combustion gas exhaust flue extends vertically through the center of the tank in contact with the water therein. A restrictive baffle is secured inside the gas exhaust flue to retard hot gases rising in the flue from the combustion chamber whereby to increase heat transfer from the hot gases to the water in contact with the exhaust flue. A draft inducing blower is secured in a top end of the exhaust flue above the top wall of the tank. A heat exchanger is in communication with a heat exchange section of the flue above the top end of the exhaust flue to extract further heat from residual hot gases in the exhaust flue.

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First Claim