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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 https://www.waterheatermanuals.com/ao-sm... 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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