I have state censible 510e water heater, that at least 10 years old. It doesn't heat enough water or it doesn't heat at all especially in the morning (5:30 am I have almost cold water). today it started to make noise inside like something was hitting it from the inside, not regularly. What does all that mean? Monika
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If the heater is more then a few years old the heat exchanger is probably corroded. Air flow from the blower motor can't squeeze thru the exchanger fins and causes loud vibrations. It can sometimes be cleaned but usually requires replacement of the heat exchanger. If you are not familiar you should definitely have a professional sevice the unit. Continued use in its current state can cause many other issues. Be prepared because the heat exchanger is the most expensive part of the heater and the most difficult to replace
Match voltage to water heater: This electric water heater, like all electric water heaters, will work on 120Volt, 208-240Volt or 3-phase unbalanced. But wire size and breaker must match element wattage. If you have outlet, check the wire size and breaker, and check what other devices are drawing power from same circuit, then add up total watts and compare with charts on link below. http://waterheatertimer.org/Color-codewire.html#water-heater
Check your thremostat setting if it is set to highest position it may be causing some of the noise over heating the water and making the noise. And you can put an insulated jacket on it to maybe help with sound.
The noise is inherent in electric hot water heaters. It is the noise that the water makes when it is being heated by electric heating elements. Mineral buildup on the elements can make it worse, so changing the elements can help...but will not totally elimenate the noise. When I install a new tank and turn it on all I have to do is listen to it to see if it is working or not...even brand new will make a sound...it is the sound of hot water... :-)
About the only device in that heater that could cause the noise you describe is an electrically operated valve that controls water flow.
Rheem is a better-than-average company so I would give them a call and describe your problem to them; I'll bet that they will be glad to tell you which part you need and supply it to you.
We had a heat pump system from Rheem that needed only the replacement of one large relay and the outside unit fan motor during more than 25 years of service and is still operating at age 30 in our former home.
I would say then the heating element has a resistive short to ground. The 1.98m Ohm reading is high, but not high enough -- should be infinite. I would say replace heating element... And, when you install new one, make sure there is no water leaking thru heating element cavity and ensure area around cavity is clean & "in order".