I have an older rental property that has one boiler, two circuits. One circuit is for the 3rd floor and is baseboard. The other is for the 1st and 2nd floors (one common thermo for them). It is radiator style heat. The second floor is much cooler. To balance the heat, I was thinking of (1) removing a radiator section from the 1st floor, (2) breaking the line and adding either a radiator or baseboard on the 2nd floor ---> if so, I am going from 2"(?) black to 1"copper ---> gotta be an issue with flow there? Could I WYE off the black and run two lines then bring them back together at some point?
I am just starting to think about this so I apologize for not being more specific, but any recommendations/comments will help me get focused.