Re: What The Heck Is That Noise?
If the pipes are exposed, drive some wooden shims between the pipe and where it runs through framing members (studs, joists, etc.). If the pipes themselves are resonating, this may dampen the vibration.
Is the recirculation pump mounted under a sink or at the water heater? Does it have a dedicated return pipe, or does it backfeed into the cold water lines?
The "Senior Member" designation under my name doesn't mean I know a lot, it just means I talk a lot.I've been a DIYer since I was 12 (thanks, Dad!). I have read several books on various home improvement topics. I do not have any current code books I can refer to. I was an apprentice plumber for two years.