Water heater Humming
NOISY WATER HEATER Problem with Rheem 40 GAL ELEC TALL Water Heater 6YR SC 82VH402 Started humming periodically when using hot water and tankis filling up with cold water Usually when a tank is making noise, it means the tank needs to be cleaned out or flushed. I wrote a page with diagrams showing how to clean out a tank, and how to flush the tank. Page shows gas and electric water heaters. See if this helps: http://waterheatertimer.org/Clean-sediment-out-of-water-heater.html