How many gallons of water does a dishwasher use?
National Energy Awareness Month is approaching, so it's a good time to remember that the energy use for a dishwasher is between 0.87-1.59 kWh per load, and the average dishwasher uses six gallons of water per cycle. More efficient dishwashers, Energy Star-rated dishwashers, use four gallons per cycle.
Most of us use warm water for washing and rinsing our dishes, which means half the water used for a load of dishes needs to be heated. Heating two gallons of water with a hot water heater takes just under 1,000 BTUs. Just like with your bathtub or kitchen sink, the warm-to-hot water in your dishwasher has to be actively pre-heated before it makes it inside the appliance itself.
More Ways to Save Energy:
-Best Lightbulbs for Your Household Appliances
-Measure Your Home's Energy Efficiency
-Energy Tip: 5 Ways to Reduce Your Water Bill
Should I hand-wash my dishes?
It may seem reasonable to hand-wash when you have only a small number of dishes to do, but it’s actually extremely wasteful. Obviously you wouldn’t wash an entire load by hand with an empty dishwasher at your disposal, but if you did, you could use more than seven times the amount of water your dishwasher requires.
And contrary to what your mother told you, rinsing each plate before tossing it in the dishwasher really doesn't do much good. The dishwasher simply doesn’t require that sort of preparation, and the water you use to do so is just being wasted. Simply scrape your scraps in the trash and call it good.
