Water heater noise

My water heater makes a loud moaning noise when hot water is in used. Does anybody know what that me

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Tina Myree

Tina Myree

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My water heater makes a loud moaning noise when hot water is in used. Does anybody know what that means?
 
Phog

Phog

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It sounds like thermal or pressure stress. Do you have an expansion tank? How old is the water heater?
 
Reach4

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Check that the stop valve on the cold coming in is fully open.
 
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