I used to be very proud about hand washing my dishes, what I judged to be the best ecologically thing to do. To my deception, researching about hand washing dishes versus dish washer, I came to find out that modern dish washers are the way to go! They use half the energy consumed during the other process, use one-sixth of the water and less soap. The study also found that dishwashers excelled in cleanliness over hand washing.
The study recommends using the dish washer with a full load and avoiding the inefficient heat-dry, rinse-hold and pre-rinse features. Less soap is also another relevant advantage because of all the chemicals used in it that just go back to the ecosystem water cycle.
The average faucet flows at 2 gallons per minute, the average Energy Star-rated dishwasher uses 4 gallons per cycle and their energy use ranges from 1.59kWh per load down to 0.87kWh per load.
http://www.treehugger.com/files/2009/01/built-in-dishwasher-vs-hand-washing-which-greener.php
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