I have a solar heater for my pool that is 100' of black landscaping pipe tightly coiled on a piece of plywood that I painted black.
It works in the heat of day, but not as efficient as I would like.
I have to run the water through slowly and I use a secondary pump.
My question is this...
Will I get more heat if the whole operation is covered with plexiglass? I was going to test this with some clear plastic wrap like a clear plastic drop cloth.