End of last Jan we had our old cast iron boiler replaced with a wall mount combi boiler. We have 3 active zones and whenever one calls for heat the other two ghost flow.
Plumber who installed spaced the tee's on the 1-1/4" dia manifold pipe at 8-1/2" apart. As I understand it 5" should be the maximum spacing for these tees? Each zone has a Grundfos circ pump with a internal check valve, but they don't seem to be able to stop the reverse flow.
Would it make sense to have the tees moved closer together or maybe install check valves on the return lines, or both? Thanks for any input
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