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HeyBub[_3_] HeyBub[_3_] is offline
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Default Water heater noise

LouB wrote:
I happen to be standing near the electric hot water heater while the
dishwasher was running. Hear noise like "rattling". Something to
worry about or just normal? Ideas please?

Bubbling, like boiling water.

A drain and flush of the water heater can't hurt. This will probably remove
a bunch of sediment that's usually the cause of the gurgling.