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Posted by verstellung77 on January 07, 2008 at 19:30:38:
1987 HydroTherm - Hydronic System
New Expansion Tank
New Pressure Regulator (supply water)
New Gas Regulator
2 of 3 zone valves are <5 years old
I have this ocassional low frequency vibration/buzz/hum sound from all three zones. Sometimes its louder than others.
I can feel the pipes vibrating. The circulation pump (Grundfos) has a slight vibration as well.
It did this a couple of years ago. Last year it did not. Now it is back...occasionally...hmmm
Any help is appreciated..
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