Thank you very very much!!!
Yes I'm in palstine. (33-34 parallel)
I'm deside to make it drain back
Am I realy need a controler or anything? I planed to just operate it manualy. 10 dolars are not a problem but I want to keep it simple and I don't want the controller will cancel my plans to oprate the system at sumer nights too.
If it is draiback, do I need the over pressure/temprature/vacum stuff?
The pipes conectors are seeled with natural flux. It's better then teflon because it get bigger when it get wet.
the bottom of the collector is 2.8M above the bottom of the tank.