Welcome aboard!
I think that you are the first person from Macedonia on this forum.
I must admit that I do not have direct experience with drain-back systems. However, I have not heard of solar collectors failing from the stagnant phase.
I was under the impression that the drain-back cycle would kick in at night, and also protect the collectors from freezing.
-AC
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I'm not an HVAC technician. In fact, I'm barely even a hacker...
Last edited by AC_Hacker; 06-21-15 at 04:26 PM..
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