|Posted by nicktheplumber on May 08, 2003 at 21:54:46:|
|In response to Re: Popcorn noise out of hot water heater|
: It is normal, but it is caused by "nodules" on the inside of the center flue. Water gets into them, is turned to steam by the hot flue gases, and then "pop" when they burst out into the water and condense with a mini explosion.
"We have not heard it before in the 6 years we have lived here."
Actually, this is not normal, and the fact that you didn't hear this popping noise for the previous six years indicates there has been a change. What you have is scale or sludge building up inside your tank. Water gets trapped under the scale/sludge and when heated there is a popping sound from local boiling...
You could try draining and flushing your tank. If that doesn't work, you have hard scale, and you need to replace the tank.
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