Quote:
Originally Posted by jeff5may
If you don't have a relief mechanism, the system could explode from the high temp and pressure. Not a trial and error friendly rig. Extra homework up front and conservative overbuilding practice will eliminate bad days for you.
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After looking again the bellow video, it seems that pressure relief mechanism is not needed with drain back systems. Because the system is not pressurized. As I understand it, the drainback water tank is not pressurized.
http://youtu.be/VlAfTYTA0Z0