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So I have finished plumbing a 9 zone house I am renovating. The plumber that designed the system did not use Monoflo Tees. Not sure they are needed. When I asked him, he wasn't sure either. Unfortunately it is all done. Though not all of the walls are closed in. The system is using 3/4 copper. I am planning on using variable speed pumps for each zone.
I am using a return loop and supply loop.
I am using all Runtal Radiators.
Do I need Monoflo Tees?