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Old 11-14-2012, 11:33 AM   #1
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Default Rheem gas heater making a banging noise

Had a Rheem gas water heater that is making a banging noise when it heats up. Flushed out heater and removed baffle. It's still sounds like someone is hitting it with a bat when it heats up. Only a two year old heater.

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Old 11-14-2012, 11:47 AM   #2
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Check the anode rod
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Old 11-14-2012, 12:19 PM   #3
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Will have to do that next. Rheem is sending out a new burner assembly
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Old 11-14-2012, 12:22 PM   #4
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Do a water test for hardness. I have seen mineral build up so hard that flushing the tank did nothing.
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Old 11-14-2012, 12:51 PM   #5
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Tested water it was good.
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Old 11-14-2012, 12:59 PM   #6
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I think NH is on track. The only time I here banging in water heaters is when there is scale attached to the inside of the heater.
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Old 11-14-2012, 01:01 PM   #7
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I don't know I've heard them before but this is loud. Sounds like Someone is hitting the tank with a bat.
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Old 11-14-2012, 01:20 PM   #8
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Usually scale build up will sound more like rocks rumbling around inside the tank. Is your noise more of a one time hit or more of a rumble?


I don't see how a new burner assy will fix the problem.

Maybe drain the tank, remove drain valve and try to look in the bottom of the tank with a mini seesnake.. I've had to do that before in a similar situation.
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Old 11-14-2012, 01:25 PM   #9
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It's more of hitting sound that happens every couple of seconds.
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Old 11-14-2012, 01:35 PM   #10
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Just taking a shot in the dark here but maybe an extreme case of thermal expansion... Is there an expansion tank installed?

We get tons of calls this time of year for this. Everyone thinks they have a leak in a wall when it's just the plumbing system making noise as it heats and cools.
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