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Discussion Starter · #1 ·
My water heater just started making these groaning noises. It happens once every few days, it groans 10-15 times over the course of about 10 minutes, then it stops. Here's a video with the sound:





What is it? Anything I should be concerned about?
 

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Was it a windy day where wind was making the flue pipe vibrate and resonate?

The sound does not remind me of any sound a tank filled with water could make.
 

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Sometimes there are rubber heat traps on the dialelectic nipples that may pulsate which can cause a weird sound.

Call or go online to AO smith and upload and send them that video. it's still under warantee and very reputable company. They will let you know if that is anything to be concerned with.

Did they install an expansion tank?
 
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