I have a wierd one, I installed a new water pump on the water heater with a check valve and replaced both gate vales , cir pump pumps water though to the in door coil after I purge the air out of the lines. seems to be working fine. I go inside a run the kitchen sink hot side to check for air bubbles. I notice the pump temp starts to lower and the pump not moveing water anymore. I open the hose bib near the pump and have intermitten air and water comming out. Purge more air and water and it works until I open a inside tap then it starts again more air. Somone has removed the expansion tank years ago , customers says the hydronic heater worked fine until I installed a new water heater. Wheres the air comming frome ? Need help.
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hydronic heater problem