you just solved your own question
I like that
but now Ill have to give the jailer back her laptop and get shackled in for the night -- where did I leave that sharp object
Rob R. wrote:I don't have nearly the experience of other folks in this business, so take or leave my advice. With that said, I just finished a coal boiler install on a system that has baseboard, radiators, and a big radiant system. I piped it like this:
The diagram doesn't show the mixing valve for the radiant zone, but you get the idea (ignore the pipe sizes and such on the drawing, I just picked it as an example). The primary circulator turns on and off as needed to keep the boiler at 145F or above, meanwhile the zone circulators keep on running. The boiler never gets slammed into condensing temperatures, the circulators serving the zones don't need to turn on and off to protect the boiler, and there is enough flow in the primary loop to prevent a huge delta between the supply and return. It runs beautifully and the home is very comfortable. It always depends...but that works for me. Just food for thought.