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Pwall

Quick easy pumping question. I have a Utica H20 40 gal indirect water heater. It's currently being fed by a Taco 007 ECM pump from a Utica Trifire Boiler 4075. This circulator is dedicated to the DHW tank. There are 2 other zones but they have their own circulator and the DHW has priority. The documentation I can find on the tank indicates the ideal flow would be 14 gpm at 5.7 ft head. Those flow requirements are a bit over what that pump is capable of. It's probably flowing around 12 gpm or maybe around 11 for that head. Should the pump be ok even though it's a bit under powered or should I look at something more powerful even though at those performance specs it gets pretty pricey? Or possibly parallel pipe 2 small cheaper 005 size pumps to split the gpm requirements?

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