What to Do If You Hear Strange Noises Coming From Your ...
2020-2-14 · Popping or knocking sounds: Your water heater might go 'pop, pop, pop' when there is a lot of sediment built up in it, or it might sound as if the hot water heater is knocking. If you have hard water, calcium and other mineral deposits can build up in the heater's tank. The popping noises are produced by water boiling underneath the sediment.
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