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So I am pretty commited to off grid solar, no lines or pipes come into this place, kind of remote. So I built a simple DHW system, 4 each 4x8 flat plate collectors, a 250 gallon tank with submerged heat exchangers. ( similar to the one in Build it Solar) And the topmost panel tops out at 18' above the tank level. I went with a TACO 009. But too many 90s involved I reckon, since I only get a trickle return. And I think I already trashed one cartridge by over working it as the impeller came off. I need to up my pump. Should I order another 009 and series them, or is there a better alternative? Also can one bolt Tacos flange to flange for series? Thanks folks.