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sizing pump for solar system
My 30 year old grundfos UPS20-4 for the glycol loop on a Grumman sunstream system is almost gone. I cant find a cross reference or pump curves for that model. So when figuring the head and gpm for my system, how much might I add for the head in the collectors and how to figure the gpm/btu delivered relationship. It seems that a pump with a very low curve like a Taco 006 is fairly close but I'm just guessing. The Grundfos sight doesn't go back to include my pump number. Thanks, mark s