While not a true solar shower, it does get pretty warm when left in the sun for a couple of hours. Camp showers can get pretty heavy, so not having to lift this unit up is a big plus. I was surprised about how much pressure can be generated - plenty of pressure for a nice shower. Filling it can be kind of tricky - a long funnel (like used to add oil to an automobile) makes things much easier, especially if you're adding hot water.
All-in-all, a winner!!