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New Rheem electric 50 gallon not heating

I just installed a new Rheem electric 50 gallon hot water heater. I am getting power (220) to the unit. The heating elements are getting power. I have waited over 2 hours with the thermostats set at 120. No hot water. I then changed the thermostats to about 140. Now 3 hrs and no change in temp. The old water heater had a secondary ground to the frame of mobile home. I did the same.

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  • Rich Jun 01, 2010

    Hi ,, can you tell me how you wired the heater? how you tested for the voltage? where you tested the 220volts? and where on the elements you tested for the voltage .. Thanks ..

  • phillip helms Jun 01, 2010

    I wired using 10/2. From the 30 amp breaker I ran the wires to each of the wires in the junction box, one red the other black. The ground to the green screw. The old water heater had a secondary ground hooked to the frame of my mobile home. I replaced this with new. The manuel said I should run a secondary ground if I wasn't using conduit. I tested the voltage from the green ground screw to each of the load wires. 110 on each. I tested each wire individually on the elements with the green screw as a ground

  • Rich Jun 01, 2010

    I wish you had said that you tested your power between the two hots and confirmed that you have 220 volts. Yes I see you have two 110 tests .. but please test between the hots and confirm the 220volts. Your secondary ground is OK .. not usually necessary but a good safety , specially in a trailer. Do you have no hot water , or a limited hot water??

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Check the elements, if you have access to a meter to check them. If they are getting power to elements and you have no hot water.
The elements are not working correctly. I had some elements check out ok till the thermostat's turned on and the elements didn't heat.
Sounds like the elements are bad.

Posted on Jun 01, 2010

Testimonial: "Thank you for the information. What if the elements are good?"

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I have water in the junction box on top of my hot water heater and into the electrical conduit leading to the hot water heater.


I do not see your earlier post with photo.

The problem could be the conduit.....
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-So if water is coming from conduit, it will accumulate into junction box and not in the water heater wiring cavity.

Next thing....
... a water softener can cause rusted tank.
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-Here are details for checking anode rod each 2-3 years:
http://waterheatertimer.org/Replace-anode-rod.html
http://waterheatertimer.org/How-to-maintain-water-heater.html
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html

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Energy factor rating


Rheem 50 gallon Pro52-2 has EF .95, which makes it ordinary 240Volt 4500 watt non-simultaneous electric water heater that produces about 21 gallons hot water per hour, with 67 gallon first hour delivery.
Recommend 80 gallon per hour first hour for oversized bathtub.
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Maintain electric water heater and it will last indefinitely.
http://waterheatertimer.org/How-to-maintain-water-heater.html
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It could be element shorted to ground through steel tank, so don't touch tank when breaker is ON.
Or you have undersized 12 gauge wire and 20 amp breaker and the heat has loosened breaker on the busbar. Breaker trips when heat exceeds breaker limit. Jiggle breaker and listen for crackling sound.

To restore hot water now:
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Hi,

The next thing you need to do is find out whether you have 240v to the bottom element....the top will not heat till the bottom is satisfied...
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