Hi, old house 1926 FHW boiler system. Original zone whole house (2 floors) one circulator all cast iron radiators all good. Added 2 story addition with all baseboard, 1st floor part of original zone still ok, new space a little colder but ok. 2nd floor new space is more isolated from rest of house probably most distant from boiler. This is the second zone. When running second zone even if 1st is not calling for heat the whole house gets too warm. Just to keep second zone comfortable often makes rest of house like sauna. Suggestions for remedy? hopefully NOT including new piping! PS Circs are on returns I believe.
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