I'm building my own solar water heater I need some technical advise.
1. I will be using roof top solar panels and will need to convey the heat to the basement for storage. Is there a more cost effective 1/2" material than copper that will withstand the temperatures (200 degrees or more)
2. What is the best insulation for the pipes
3. The design includes a heat exchanger that will involve a concrete slab with the hot water running through ir. I I use copper, will it hold up and not corrode in the concrete? I need it to withstand the temperatures and transfer heat easily. Will Pex work?