operating cost of dishwashers

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It is likely that dishwashers use less water to wash dishes than doing the same number by hand. Dishwashers do a better job of killing germs because they use hotter water than you can use by hand. The energy rating of a dishwasher is based on use of hot water because about 80% of the energy is for heating the water rather than running the dishwasher itself. Therefore, look for features that reduce water usage. Consider purchasing a dishwasher that uses fewer gallons during the different cycles since they will cost the least to operate.

Compare both the Energy Guide labels & the Energy Star information. Today's Energy Star dishwasher can save 20% compared to standard models. Select a model w/ a heating element. It can boost the heat of the water used in the machine to 140°F, the temperature required to clean effectively. Then you can lower your water-heater thermostat to 125°F & save energy. Each 10-degree reduction in the water heater temperature setting will save you up to 13% of your water-heating bill. A lower setting will also reduce the danger of scalding. Also check to see if the dishwasher has an energy efficient no-heat drying cycle. It costs less to air dry dishes.

consumer tips

Dishwashers have two classifications: compact & standard. Compact models use less energy but hold fewer dishes. A compact model may actually result in greater energy use if you have to operate it more frequently.
Choose a dishwasher that has several wash cycle selections. You can then choose a "light or energy-saving" wash cycle & save energy by using less water & operating for a shorter period of time.
Choose a dishwasher that has an air-drying cycle as well as a heat-drying cycle. Heat-drying elements use a considerable amount of energy; circulation fans for air-drying use very little.
If your dishwasher has a booster heater, turn your water-heater thermostat setting to 125°F.
Scrape instead of rinsing off large food pieces from the dishes. Soaking or pre washing is usually not necessary unless food is burned or dried on the dishes.
Operate the dishwasher w/ a full load & select the energy-saving cycle when possible.
Do not use the "rinse/hold" for just a few soiled dishes. It uses 3 to 7 gallons of hot water.
An often overlooked convenience is a delayed-start control. It allows you to run the washer when you are asleep or at off-peak hours when utility rates may be lower.
Be sure drains & filters are clear of food particles.