I have a raised ranch with heated finished basement.
Two zones with zone valves,one circulator. The
system is natural gas hot water slant fin. The basement heat is quiet and OK. The main floor, even after several air purges still banging away. I replaced the main feed fill regulator valve,thought the pressure to the main floor might be low.Still bangs very loud.What else could be the problem? Could the expansion tank have anything to do with it? How would I know if the circulator is OK or not? Any suggestions?
Thanks Tony M