I'm not so sure that a series connect would be more efficient than a parallel with the way you are planning to run the system. With tank 1 on its own, it probably will be valved. It could be used in many different ways. With it fuller (or higher in head level) than the other 9, it could naturally burp the other tanks. In a parallel setup, the tanks would naturally stratify and equalize the stored or harvested heat and transfer more evenly.
Last edited by jeff5may; 10-02-14 at 11:01 AM..
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