The wife says she can hear it sometimes when the cold is running but I can't. I have not been able to pinpoint where the sound is coming from because it seems to echo through the whole system. Water delivery is fine. Hmmmm.Do you mean like a faucet in one of the sinks or something? I did have a couple open to bleed the line. Don't remember exactly when I closed them other than after bleeding the air from the line after filling the heater. This seems to happen when I run about every faucet.
This is something I had not even begun to suspect. Thanks.
