Question about Rheem 40 GAL ELEC TALL Water Heater 6YR SC 82VH402

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Our hot water will last for about 5- 10 minutes then turn luke warm. I have replaced both elements but problem remains . Do you hink it is the thermostat ? thanks chazz

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If you have not done so already then turn thermostats up to 140 degrees. You may also try to drain and flush tank to clean out any mineral deposits that could be hurting your effiency. To do this shut off electrical power to heater then connect garden hose to drain valve on the bottom of tank. Run hose to floor drain or other safe area and open drain valve. If it drains good with the water on then let it flush for a couple of mins. then shut incoming water supply off. Let tank drain as far as it will. You may need to open a faucet on the hot side of nearby fixture to break vacumn.
Drain it completly then close drain valve and hot side of faucet.Turn water supply back on and let tank refill. Do this 2-3 times to get inside of tank as clean as possible. Hope this helps you and thanks. P.S. You may need to replace thermostat also.

Posted on Mar 28, 2011

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When i turn on the shower the water will be warm for one minute and then cold, I have to turn it down and open again to get warm water


Reasons for this: ???
  • bad elements,
    • if one is bad, just replace both
  • bad thermostat or both of them?
  • broken dip tube / cold water mix tube
    • Notice the "RED" in the 1st pic on the left. 90% + of the tank is hot, with a broken tube, 75% of the tank is luke warm to cold.
Check for them. not that difficult of a fix


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1 Answer

I have a ruud ruudglas pacemaker electric hot water heater. model number pem52-2b. first person to ake show in the moring has hto water for about 5mins and then it turns luke warm . when you wati about 10...


sounds like thermostat but element can be checked with a multi-meter, turn power off at fuse panel, pull one wire of element put multimeter on both screws on element using continuity setting should show continuity or beep as most do if not its burned out and needs to be replaced

Dec 01, 2012 | Water Heaters

1 Answer

Model # 81IP20S 2008 HYLINER rv. WATER WAS HOT AND THEN SWITCHED TO LUKE WARM. WE REPLACED THE ELEMENT AND IT IS DOING THE SAME THING.


check the amperage on both elements, there are two when one gets satisfied the other turns on,just because there is voltage does not meen it is heating,call an electrician

Jun 04, 2011 | Rheem Water Heaters

1 Answer

My oil fired hot water heater provides only sporadic hot water. For example, when I am home alone it takes 2 minutes to get luke warm water in the shower, then it is only warm for a few minutes, then...


It sounds like your thermostat on the water heater isn't working properly. try turning it up higher and if this doesn't work I would have a service techy look at it.

Mar 24, 2011 | Water Heaters

1 Answer

I have a Rheem Fury 40 gallon tank. I have hot water for about 10 minutes then it turns to luke warm. The unit is about 8 years old, should i just replace?


Sound slike the top element is gone bad and the bottom one is the only one working. Best bet to change out both elements while you have to replace one anyway , turn power off, drain water out and change out. Once you are done open a faucet to get air out of lines when you turn water back on, Once air is out of lines you now can turn power back on.

Jan 10, 2011 | Rheem 40 Gallon FVR NATGAS Low WATER...

1 Answer

My water is luke warm and then runs cold and then overnight goes back to luke warm. I turned temp gage s up to 150 and still luke warm. I have a Rheem 40 gal electric tank


Its time to replace the heating elements. 90% of the time it's going to be the bottom element, but if you're going to drain it anyway, elements are only $10.00 to $12.00 I would go ahead and replace them both. Replacing the elements is simple just follow these steps.

Step 1: Turn off the power to the water heater.
Step 2: Turn off the cold water valve supplying the water to the heater.
step 3: Drain the water heater there are a few steps to proper draining, connect a hose to the drain port on the lower front of the heater and open the drain valve (remember its gravity drain so downhill all the way) pull up on the pop off handle to relief the pressure in the tank and to let air in so it can start draining also open the hot water valves in your tubs and showers (the more air you can get in the faster it will drain)
Step 4: Undo the 2 wires connected to the heating elements and unscrew the element counter clockwise until it comes out of the tank (they make a socket type tool for removing the elements it's real cheap and can be found at any Home Depot)
Step 5: Take the elements to Home Depot (or any hardware store) and find the exact replacements also get a 1/2" roll or Teflon tape.
Step 6: Teflon tape the threads on the elements (with the threads facing you apply the Teflon tape clockwise) about 4 times around the threads is good.
Step 7: Reinsert the elements into the holes and snug them up tight. (Clockwise) Not supper tight
Step 8: Reconnect the wires to the elements they are 220 volts so there is no neutral either wire to either screw is fine.
step 9: Close the drain valve a disconnect the hose make sure the pop off is closed and turn the water back on leave the tubs and showers on until the tank is filled and air quits coming out of them . Check around the elements for leaks if you see a leak simply snug it up a bit more.
Step 10: Set temp to 125 or whatever you find efficient, replace element covers and turn the power back on and you're all set.



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Nov 23, 2010 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

1 Answer

Hot water for only 5 to tn minutes then have to wait.


You have an element gone of your hot water is running out quick and having to wait for it to heat up again. Best thing to do is to go ahead and replace both of them.
If you replace just one it will work the old one till it causes it to go. Most of the time if the top element is good you will get a blast of hot water and then it will get cold. With the bottom element only working it will be luke warm water for a while then go cold.
If you need a guide how to replace them got to the link below for further information. It will guide you through trouble shooting your heater.

http://www.water-heater-repair-guide.com/waterheaterelementreplacement.html

Jun 24, 2010 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

1 Answer

50 gallon electric heater not working after about 5 minutes in the shower the water gets cold and the rest of the house i do have 240 going to water heater thermostats goood element good


Some elements will read with a meter good until they heat up.

Hot water then going to ice cold top element is working and bottom bad. Luke warm water and then goes cold bottom element good and top element bad.

Elements and thermostats are not to exspensive to replace.

If you have power only two thing's left are the thermostat's and the elements.

May 21, 2010 | Water Heaters

1 Answer

Water is lukewarm. Not hot! Two year old tank, 220 amp is present. Both sides of relay have 220.


Make sure you have power going to elements from thermostats. check lines going to elements.

Luke warm water is the result of an element gone bad most of the time. One at th etop gone will cause you to get just luke warm water and one at the bottom gone will give you real hot and then cold.


The elements are not to exspensive so if it has two you might as well replace both of them. If you just put 1 new one in it will work the old one till it goes.

Cut power off and cut water off to water heater and drain heater, open hot side on any faucet to help it drain. once drained remove element they have a tube type socket at hardware stores for the removal of it.

Put elements in and fill water heater till all air is out of lines before turning power back on. make sure water is flowing out of all faucets before turning power onto water heater.

The reason being is the elements has to be in water not open air in tank or it will blow new ones.

Dec 16, 2009 | Little Giant Water Heaters

1 Answer

My boiler lights up,stays on for 1 minute then cutts out...


You could check the flame sensor is clean and the connections are tight . check the pressure switch as well. also get the over heat could be shutting off too soon ,

Check the rads for air lock ,

May 11, 2017 | Water Heaters

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