No house water available. Here's the plan. We will be spending Thanksging week at the beach. Before I leave I was going to do a good long cleaning and dump, then just as we leave, pour laundry detergent down the toilet and empty the hot water tank into the tank. We will be driving about 150 miles(half way home) and spending the night. I know the water will cool as I'm going down the road....but... While it's hot and soapy I thought it could work everything loose. Then when I get up the next morning and do the final dump/cleaning, it would flush everything out. I'd come home with a clean tank and sensors for the winter, and take it off to have it winterized. I can't see a down side. That usually means I'm overlooking something pretty obvious...