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Some dishwashers often save more energy than if we wash the dishes by hand, because of the amount of water that we use when washing the dishes by hand. Depending on the brand, dishwashers typically consume 28 to 45 liters (7.5 to 12 gallons) of water per normal wash. Hand washing a day's worth of dishes may use up to 57 liters (15 gallons) of water. One University study found that dishwashers consume about 37% less water than washing by hand.

Several steps can be taken for additional energy savings when using a dishwasher. The setting on a home's water heater can be turned down to 120 degrees Fahrenheit (49 degrees Celsius) if the dishwasher has a booster heater. While some machines feature no-heat air-dry set-thing, simply opening the door after the final rinse to let the dishes air dry will save energy. Pre-washing the dishes before loading generally wastes water since most machines can handle even heavily soiled plates

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Q: Is using an automatic dish washer better for the environment than washing dishes by hand?
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