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Header Tees are 2.5 inches apart center to center. If you look at my diagram above you will see upstairs baseboad is fed prior to hot water going thru basement and 1st floor mixing valve that supplies all othe radient zones. Dont understand your last sentence. Look at diagram above looking at...

This is my design. Circ pump at input of propane boiler is Taco 0014 all other zone circ pumps pumping return water ar Grundfos 15-58FC. As I said before I believe the primary loop in the boiler header powered by the TAco is overpowering the return water powered by the GRUNDFOS.

Installed Ultra `155 with factory 1 1/2 header. Came with Taco 0014-F1 (32 gpm max) circ pump. Attached 1 1/4 copper to input and also to output of header. My heating system has several zones all driving the return water by Gruundfos pumps with 17 gpm rating. Return water temp at the 1/4 inlet...

current wood boiler design 1050 gal water heated to 200 deg. Based on wood boiler location 10 degree loss to zone inputs. Raidant zones mixed down to 140 deg baseboard zone (upstairs hardly ever turned on) get 190 deg . Return from radiant zones is 20 deg less (120) looses 10 going back to wood...