My system has 1 circulator (TACO 007-F5) on the return, pushing into the boiler.
If FT.HD. = loop length * 0.06 and GPM=HPx2178/FTHD, here are GPM in each of my loops using TACO 007-F5, 1/25hp, 3250rpm vs TACO 0011-F4, 1/8hp, 3250rpm:
ZoneX: FTHD, gpm(1/25hp), gpm(1/8hp)
Zone1: 10.8, 8.1, 25.2
Zone2: 9.0, 9.7, 30.3
Zone3: 6.6, 13.2, 41.3
Zone4: 7.2, 12.1, 37.8
Zone5: 6.0, 14.2, 45.4
Recommended flow thru the new boiler is 10gpm.
Are those flows with the 0011 simply TOO high?
Most everyone suggests 1 circ/loop. Since it's rare that more than 2 zones call at one time, and zone 1 is easily the most active, what do you think of just adding another 007 on zone1?