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Balancing old gravity system
Previous owner hacked an old gravity system (2 pipe direct return) into a 3 loop system. There is 1 B&G circulator pump on the return pipe.
Loop 1 - 5 radiators
Loop 2 - 11 radiators
Loop 3 - 4 radiators
In order to satisfy some rooms in the cold loop, other loops tend to get overheated. The thermostat is in the coldest room.
What would be some options to balance the system?