Solar water heaters are very simple devices, they utilise the heat of the sun to directly heat the water, no PV cells, nothing, just a heat conductive system.
- Build a weatherproof box to put on your roof. Glass or black painted metal would be best for the top surface, dimensions are up to you
- Then you'll take a bunch of 3/4 inch copper pipe and 90 degree fittings and make a square spiral or zigzag pattern that fits into the box.
- Run a branch off your water supply up to the box and then back down into your water heater
- If you live in a climate that has a chance of freezing in the winter you'll need valves and a port to drain the system so make a bypass connection in your house that lets the water skip the heater. Put a valve on that, a valve on the supply line and return line from the heater.
- Install a booster pump for pressure.
- Fill the box with heat conductors to improve results, black painted meal for example
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