1) I bet the water heater has hot water, but hot does not arrive at tap because of bad faucet cartridge or bad recirculation system check valve
http://waterheatertimer.org/Crossover.html
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html#crossover
2) When cold water arrives at tap, go check if water heater has hot water. Then do the crossover test. Then add comment and say what you discover
3) Electric water heaters can be repaired by homeowner using generic off-the-shelf parts from local hardware store.
If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7
SOURCE: Rheem small 6 gallon water heater vibration/noise
If the water heater is working fine than I would not worry about the function of the water heater. What the problem may be is that some of your WATER LINES HAVE MOVED, AS THEY WERE NOT SECURED PROPERLY. The sound you may have heard was the Copper or PVC(Plastic) lines just getting back comfortable. I Suggest checking that your water lines are secured about every 3 or 4 feet with the proper ancjhor....Metal for metal pipe, copper for copper pipe, etc. Sometime as in my house, pipes are run through a hole drilled through a stud or a piece of wood, usually when hot water is run through this pipe. You can here an expansion of the water line interacting with the pipe expanding, if the hole in the wood was not drilled big enough......Experience of remodeling a very old house.......Joe
SOURCE: Rheem 50 gallon gas water heater less than one
it could also be the dip tube. this is a tube that is installed at the time the unit is made.it is a plastic tube that is on the cold intake side of the hot water heater.it may have fallen inside the unit or may not be in the unit at all check to see if there is a plastic tube this will help the heater stay hotter for a longer period of time. good luck with your project.
SOURCE: My rheem water heater doesn't seem to be heating
try setting the bottom 10 degrees hoter than the top could be in short cycle (thatis the bottom calls for heat on the bottom element and set too close so goes back to top and cycles off
SOURCE: Not heating water hot enough or as much water.
You probably have a bad heating element. Probably the upper element.
SOURCE: Rheem 50 Gal two 4500W heating element - not enough hot water
one element is off peak and one is boost could be thermostat or ripple controller in fuse box or one dead element
Testimonial: "It is very good advice. I bought a tester to check out both upper and lowre thermostat and heating element; I've replaced the lower heating element "
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