Welcome to the forum!! I got nothing to add regarding the boiler piping design, I am a stove guy myself.
But I had to give you an "atta guy" for being so receptive to the critique given about your design.
I see many questions like yours asked and too many times when the critique is given the OP takes it like the responder called their baby ugly or something.
thanks, I need all the help I can get! Doesn't take much reading around on other forums to figure out this is the best forum around when it comes to all types of heating, folks on here have experience and that's what counts. Nice to see others take time to help us dumb people (novices and yes I'm pointing right at myself) figure out things they probably should hire done but where's the fun in that? learn a lot in the process too. I'm hoping the radiant floors make the other half forget how much $ it took from scratch
gearhead wrote:I think I'm on the right track now, 1-1/4" pipe, original drawing is trashed. I plan to add hot water base board in the future, hot tub and possibly a garage floor someday to the loop so, I wanted to make sure each loop wasn't suffering from being down stream from the last heat load with a series loop. I realize that I'll need a mixing valve on any pex radiant circuits. What do you think of the new drawing?
Looks better, The vertical common pipe must be sized to the sum of the zone pumps. A little oversizing would not hurt. I would use 1-1/2" pipe as minimum. If you used 2" pipe, it would act more like a hydraulic separator and naturally separate dirt/air from the system. Easily made with tees and nipples.
going with a 2" manifold but keep the pipe coming out of the boiler at 1-1/4"
thanks guys for the help, think I have a handle on it, can post picks when I start piecing it together. Used Yanche's toolbox to do my calculations, took an evening to get my mind wrapped around the equations... never knew plumbing was so damn complicated