Yeah, it's just an old sketch. I was thinking of using a 2 gallon garden sprayer instead of the Jerry Can to make a Solar Shower. Amazon has some Sun Tracking devices that are affordable to use to drive the motor using a time delay in the circuit. So every 10 minutes the motor will come to life for a few seconds to update to the Sun's position in the sky.
I would imagine setting the outfit up in the late evening to aim it to the east so it would begin heating water early in the AM. But with a small solar panel charging the battery this unit could produce hot water all day if there is enough sunshine. Kind of a hybrid heliostat water heater.