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DKH Member Posts: 15
Piping a multiple zone wall hung boiler. (Rinnai M series) Primary loop controlled by internal boiler circulator with hydraulic separation with closely spaced tees. (Factory supplied / purchased kit)
Secondary loops and zones (3) controlled by individual circulators.

Do the individual zones also require closely spaced tees? I have seen some "wall hung" boiler piping, no closely spaced tees and also no complete primary loop back to boiler. Not sure how this works. Been piping old-school cast-iron boiler with the boiler being part of the secondary loop and then each zone closely spaced tees with a completed loop back to boiler. Would this be correct for my wall hung, complete loop, isolating boiler with hydraulic separation and closely spaced tees on each zone?
Diagrams would be most helpful.

I hope I explained my questions correctly and any assistance is well appreciated. Thank you