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So i have customer that would like to convert his 1 zone system to a 2 zone. The system has 14 cast iron radiators 7 on each floor with the feed and return going into the basement. My tought was running two 1" pex lines feeds and two 1" pex returns with tees to each radiator. My question is will the system work correctly and be balanced or will the first radiator on the main line be hotter then the last rad on the main line. I will attach a diagram of what I was thinking.