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Repair guides and support for gas and electric hot water tanks, boilers and household heat exchangers.

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A.O. Smith water heater

Water heater makes a bubbling sound when reheating water in the tank

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Have you checked the operating instructions? Check your model at and go to the troubleshooting sections to find the possible cause. Sometimes this is normal operation of the water heater, but it all depends on your model.


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Hi @d2icsw2fhjpsdob,

What is the model number of the water heater?

Sounds a though the thermostat may be faulty and not turning off the power to the heater when the water temperature has reached its upper limit or cut off point.

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heatherw319 will be eternally grateful.
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