We tripled our shower system to fifteen gallons this year. Three hours in the sun, and you have a comfortable shower. Five hours in the sun and it is hotter than what probably comes out of your sink. One of our neighbors leaves a black hose in the sun. He can make coffee out of his hot water.
When the bag is hot, you can either take the container into the inside-the-cabin shower. Or you can have a glorious outside shower!
Which would you opt for?
Another question: Why do we use fossil fuel in the summer time, just to heat water?