Originally Posted by CT-18
It could be not strapped down well enough. You could also have a washer on the valve starting to go bad and disrupting the flow of water causing vibration. It is sometimes hard to tell without being there. Some of the service guys may know more than me, i am more industrial/commercial.
Thank you for replying.
I spoke with an engineer at Metro water and he suggested that electric water heater tanks do not "need" an expansion tank when installing a PRV valve. He said gas water heater tanks do, but not electric one.s since the heating process is faster on a gas powered one. He agreed that plumbers recommend expansion tanks sometimes to apiece the warranty on the tanks as required by the manufacturers.
Does this sound correct, it would save me money to only install a PRV. Thoughts?