“Gravity flow problem solved when Taco Flo-Chek combined with two Taco circulators with IFC were added... After a contractor added a second zone without isolation, we had a serious gravity flow issue. Adding Flo-Cheks on the two supply lines to the original gravity-based system fixed the problem. Both zones now work flawlessly with a Taco Three-zone Switching Relay (SR503).”
