RV water heaters can be easily made more efficient by loosening one or two screws that hold the U-tube tight. Sometimes the orifice that connects the gas valve and the U-tube is not aligned properly with the U-tube, and the loosening of one screw or the other will allow the straight alignment of the orifice and U-tube. After loosening the screws and realigning the U-tube, simply tighten the screw and the water heater will be more efficient because the perfect gas and air mixture will be present.
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