Setting Hot Water Termperature

High water temperatures waste energy and threaten occupants with scalding. High water temperatures also speed the buildup of calcium and magnesium deposits in the tank and pipes. These minerals become less soluble as water temperature increases, and precipitate out of the high temperature water. A high water temperature also speeds up corrosion, which is the death of many water heaters. Reducing water temperature to around 120 degrees F minimizes mineral buildup, protects residents from scalding, reduces corrosion and decreases energy consumption.

The storage temperature of a home's hot water is influenced by the presence or absence of a dishwasher. Most dishwashers have small water heaters inside that will boost the temperature about 20 degrees F or more. If the dishwasher has a booster, set the water-heater storage temperature to 120 degrees F. If the dishwasher doesn't have a booster, the setting should be between 130 - 140 degrees to get dishes clean.

Electric water heaters have a thermostat that is adjusted by turning a setscrew or knob. Gas and propane water heaters have a temperature dial located near the bottom of the tank on the gas valve. Marking the beginning temperature and adjusted temperature on the dial of the thermostat will provide a future reference. Several adjustments may be necessary before the water temperature is right.

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