As you said in the first post, the largest part of energy cost of doing a load of laundry is going to go into heating the water. So you've already got the old washer hooked up to the garden hose. Now you need a couple hundred feed of black plastic irrigation tubing, with hose adapters at the ends. Coil it up in a sunny spot, and do your wash in the middle of the day, with free hot water :-)
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