We turn on the water heater (either from solar/batteries combo or propane depending on insolation) as hot water is required. We place a container under the tap and let it fill until the water is hot. We use that water for tea/coffee/cooking or just put it back into the freshwater tank via siphon hose.
We are generally boondocking when not mootchdocking (staying in the backyards/mountain sites of our kids. We seldom boondock less than two weeks and then only come in to wash clothes, replenish foodstuffs, and drain tanks. See a lot of wildlife with solar autonomy aka no use of generator in two years.
Reed and Elaine