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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.
An older model dishwasher will use approximately 10 to 15 gallons (37.8 L to 56.7 L) of water per load. A family of four using a standard dishwasher will generate about 150 loads per year, consuming 1,800 gallons (6,800 liters) of water annually. New, ENERGY STARÂ® dishwasher will use less than 5.5 gallons (20.8 L) of water per load. Replacing an old and inefficient dishwasher can reduce this water use by nearly 1.000 gallons per year (3,790 L), and save energy through the efficient operation of the machine and by using less hot water.