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Sizing circulators for head loss on pipe distance?

wcs5050 Member Posts: 131
With heat exchangers and coils I understand friction head loss and how to combat it with correctly sized pump, but what about pipe distance. Upcoming job has boiler at far end of 100 ft building, serving 2 stories. I’ve never concerned myself with friction head loss due to distance but this one makes me curious if alteration of my pump provision should be made. Zone is 1-1/4 commercial fin tube.