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Domestic Hot Water Recirc - rattle rattle rattle
Just completed a DIY domestic hot water recirculation system and it's working well...except for the rattle rattle. It's most noticeable at the hot water outlet pipe, but reverberates throughout the house and is most noticeable in the bathrooms. BTW, this is an 80 gallon concrete tank with a bottom cold water inlet. Questions:
- Is it air? I don't think so, as that would ultimately come out of the faucets, right? I also don't see any bubbles in the transulucent PEX I used.
- The tank states it has a cold water diffuser on the input, so that could potentially be the source.
- I can minimize the rattle by reducing the flow with the ball valves on either side of the pump, that seems to help, but at some point that will impair the functionality, i.e. it will take a long time to distribute HW after the system turns on, or the water may cool down on its way through the system. Am I harming the pump? (Grundfos UP10-16)
- Can I reduce the transmission of the rattle by inserting a few feet of PEX on the hot water outlet? That should minimize the sound transmission throughout the house. Does that make any sense?
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