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It is normal for some dishwashers to run for up to two hours or more under certain conditions and on certain models. 1  On select models, the timer display or dial will stop for long periods (up to 1/2 hour) during the wash and dry cycles while the heater is activated. On models featuring Auto Hot Start, the cycle may be extended up to 20 minutes while the dishwasher heats the water.
A dishwasher made before 1994 wastes more than 10 gallons of water per cycle, according to Energy Star. Over its presumed lifetime of 10 years, an Energy Star dishwasher will save at least 1,600 gallons of water over older models.Do the math by multiplying that number and your water rate and youâll see the savings.hen Consumer Reports tests dishwashers, it measures how much water and energy each model uses in addition to how well it cleans and how quiet it is. Our top-rated dishwasher, the KitchenAid KDTM354DSS, $1,080, uses only four gallons of water per wash although most of our other top picks use five or six.