solar water heater

The solar powered pump is an elegant solution for solar water heat since it is only pumping when there is enough sun to heat water. It might be better if it charged a capacitor to run the pump ( for better time phasing to the availability of hot water), but generally it is simple and clever.

I think the idea of running some small tubing on the back of solar panels to draw heat away from photovoltaics is also an extremely elegant solution. It would increase power production, even when hot water is not needed.

Jim