circ pumps circulators

creger.robert

b & g series 60 in-line pumps
differential across pumps is 10-15
one pump is 40-45 what is causing higher differential

ScottSecor

Higher pressure differential equals more restriction/ head.  

In other words the pump with the bigger difference on pressure is working harder to move the water.  Most often this is due to a longer run, more restrictions,  etc

bburd

Or partially closed valves.

hot_rod

Plugged strainers