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Energy-Efficiency Enhancing Technologies: Side-Arm Heaters

The side-arm heater design avoids large flue losses by removing the flue from the center of the tank. Water is withdrawn from the bottom of the tank and heated over a burner in a small, separate heat exchanger. Water is returned to the top of the tank. A small circulation pump moves water through the heat exchanger when the burner is on. The burner could have electronic ignition, which would reduce the pilot light losses. Auxiliary power is supplied by a low-voltage plug-in transformer. Input range for commercial side-arm water heaters is 82,000 to 1,000,000 Btu/h.