Question: solar water heater how to make?
Answer: Electric water heater tank (used is fine, as long as it's in good shape)
Black paint.
Plywood box (large enough to hold the tank)
Sheets of glass.
Hinged lid for the box (to reduce nighttime cooling)
Insulation material.
Pipes/fittings.
Mountings (for roof, side of house, or ground level)