So i live in a 6 unit apartment building, 3 floors, 50' x 50'
225K BTU Slant Fin boiler, cast iron baseboard radiators, Tekmar 256, 2x Taco 0015es circulators, 2xEcobees with wireless sensor in each apartment.
There is a single supply and 2 returns. Circ A heats up apartments 1 and 2, circ B heats up 3-6.
Big problem is that apartments 2 and 4 are always too hot, my guess is because the main supply labelled X runs between them and is always hot even when the circulators are off.
Will it be enough to install internal check valves in the circulators to mitigate this?