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Baseboard Heat - gravity problem?
I have a 5zone hydronic baseboard system in my house but have a problem in some of the rooms. Even with the thermostat off, I still feel the baseboards get warm. The contractor put in 5 Taco 007-F5 Pumps. If I am reading correctly online, those do NOT have a check valve internally? If that's the case, is my problem that there is a gravity problem feeding hot water to my upper floors unintentionally?
Any help would be greatly appreciated!