IT depends on the system, mine is going to be a drain back system using pure water. Turn off the pump and the collectors go empty. Any tiny amount of remaining water in them will steam off pretty quickly. The collectors are copper, aluminum and glass with a wood frame. my only concern is if they get hot enough to melt the isocyanurate insulation on the backs of them when stagnated. I'll be going with more of a winter angle, probably 65-69 degrees on the collectors to help with summer overheating as well. Watching the datalog of temperatures will be important to make sure they don't melt before I throw a sheet on them if it comes to it.
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