Just had a hydronic engineer inspect my system over the weekend. Finally checked the draft and set up a manometer. Measured and calculated all of my pipeing and fittings. Found out that I have 12.1 gpm flowing through the greenwood loop but only 8.77 gpm through my secondary on the New Yorker. We determined that I would either have to upsize the pipeing on the new yorker or change the 007 circulator to a 0011. I will be changing the pump and that will take me to 11.4 gpm in that loop. So I don't break forum rules PM me if you want more info about the engineer and his services. Great guy worth the call. System was working fine but I wanted to know all the specifics and now I am looking forward to an improvement.