Reading back through the thread, I gained some understanding of the system you are considering. This leads to more questions.
What space or spaces are you going to be heating with the rig?
Are you trying to get domestic hot water?
Why do you consider such a large amount of thermal water storage for such a small e-tube collector?
What about power outages?
The answers to these questions will lead to a more effective and/or efficient rig.
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