Don, I just realized that I posted back that I installed the pump in the bypass, not so. It is installed in the return line, but it is close to the bypass, not much options for the placement.
Q. I plan to run vertical pipe to the floor, but I have to get a piece. It is a KAA-2, Keystokers instructions require the bladder tank off the top of the boiler, not much I could do other than that. The tank I installed for the domestic coil is in line.
Coaledsweat, good idea on the dirt leg.