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Not getting hot on bottom,how do i tell is its t stat,or element?

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Turn the top thermostat temperature down and the bottom thermostat temperature up. Turn the hot-water on in a tub or shower and let it run. The bottom thermostat should activate first and send 208-to-240 volts to the bottom element. Once the power comes on, turn the water off. If power is going to the element but you cannot hear it heating or humming, it's the element.

When you are having a problem on an electric water heater, it is recommended that you replace both thermostats and elements. If one part is worn out, it will not be long until the other parts need to be replaced as well.

Posted on Sep 13, 2010

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Posted on Jan 02, 2017

muttandjeff
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SOURCE: only getting 120 volts to the bottom heating

replace top thermostat , one line feeds direct the other through t-stat , but make sure you have a 220 feed coming to w/h

Posted on Jan 06, 2010

SOURCE: whirlpool E1F50RD045V 50 gal elec. , top element

Sounds like you might have a thermostat problem, or burned out lower element
Lower thermostat and both elements will test for 120V at all times because upper thermostat only cuts off one leg of 240V circuit, and other leg is hot all the time.

http://waterheatertimer.org/How-to-test-water-heater-element.html
http://waterheatertimer.org/How-water-heater-thermostat-works.html
http://waterheatertimer.org/How-to-wire-water-heater-thermostats.html
http://waterheatertimer.org/How-to-replace-thermostat-on-electric-water-heater.html

Yes, the elements alternate being turned ON.
This is called non-simultaneous operation.
Look at label on side of tank: Each element has rating of 4500Watts, but tank rating is also 4500Watts > that shows that both elements are not ON at same time.
This is standard wiring for water heaters.
http://waterheatertimer.org/How-it-works.html

Water heaters can we wired differently, for example converted to simultaneous operation where upper thermostat and lower thermostat are no longer wired together, so upper and lower parts of tank are independent.
Lower thermostat is replaced with ECO protected thermostat identical to upper thermostat.
Another 240V circuit breaker is added to breaker panel, and that 240V line runs directly to lower thermostat. So upper and lower thermostats are each on separate 240V line.
The advantage of simultaneous is faster recovery of hot water, but downside is probably higher electric bill. Simultaneous wiring is usually reserved for larger tanks like 80 gallons, where elements can fall behind the amount of hot water needed.
Otherwise, ordinary non-simultaneous operation is proven to be satisfactory, if your home has not experienced shortages.
http://waterheatertimer.org/B220C.html
http://waterheatertimer.org/How-to-wire-off-peak-water-heater-thermostats.html
http://waterheatertimer.org/Do-it-yourself-water-heater-timer.html

Add a comment for more free help.

Also take advantage of fixya phone service.
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Posted on Feb 08, 2011

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1 Answer

How can you tell which heater element is out? It stays hot for about 20 minutes and then gets cold would it be the top or bottom element?


use a multimeter set on ohms reading and test each element
remember to turn the system off at the power board first as it will have full utility voltage at the elements

Nov 01, 2015 | Element Water Heaters

1 Answer

Hot water heater water is just warm am wandering if its something that i can fix. its a reliance 501 electric heater


did you turn up the thermo stat?? it is right under the top and bottom cover. Turn off the power remove the top and bottom plates remove the insulation ( its just a patch)you then should see the adjustment screw witht eh little pointer. Turn it to the right as far as you chose the more you turn it the hotter it should get.

I would split where it is now to all the way right and give it an hour to see it that is hot enough for you. If not move the pointer the rest of the way.

Now if that does not work I would replace both top and bottom elements. If the heater is 10 yeer old or older I would replace them both now anyway. they are covered with lime.

You will need a heater element to remove it. they do mot cost much you can get all that you need at home depot or lowes or advanced hardware

Thanks Tom

Sep 16, 2011 | RELIANCE ELECTRIC WATER HEATER

1 Answer

Replaced both elements and tstats now there is 240 at both elements at once and only the top one is heating the bottom is coldreplaced bottom sgain thinking maybe bad from factory but still cold will i...


Electric water heaters never power BOTH the upper and lower elements at the same time.

If the water in the tank is cold, either the top OR bottom element will be powered through the upper thermostat (t-stat), never both at the same time. The upper t-stat will send power to the upper element until the temperature of the water in the top of the tank reaches the set point of the t-stat say 140 degrees. When the water temperature in the top of the tank reaches 140 degrees, the t-stat is "satisfied" and disconnects the power from the top element and sends it to the lower t-stat.

IF the temperature of the water in the lower half of the tank is lower than the set point of the lower t-stat, the t-stat closes to send power to the lower element. The lower element REMAINS powered by the t-stat until EITHER the water in the lower part of the tank reaches the set point temperature of the lower t-stat again, say 140 degrees; OR the temperature of the water in the upper part of the tank drops, at which point the upper t-stat "calls" and switches the power away from the lower t-stat and sends it to the upper heating element instead. When the top t-stat is satisfied, it switches power back to the lower t-stat. The process will continue back and forth for as long as needed to bring the temperature of the water in both halves of the tank to 140 degrees.

You must wait until the top of the tank is heated - before the lower element will be powered to heat the water.

I hope this helps you understand how the switching happens in these water heaters. Good luck! Please rate my reply. Thank you.

Mar 24, 2011 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

1 Answer

Lose of hot water at times


Hi,
If you keep kicking the reset you have a thermostat that is bad...it could be either the top or the bottom one...but you will have the check and see if it is switching to the bottom element or not...if it does switch to the bottom it is the bottom t-stat bad, if not then the top one is bad...

heatman101

Apr 28, 2010 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

1 Answer

Hot water does not last long. Model 82vh40-2 mnf. 05/2005


If the lower heating element burns out the upper element will heat the top part of the tank then shutoff. homw depot/lowes etc should carry elements. 1 turn off breaker, remove element access cover (the 2 panels on the front of the heater) test for electricity at the reset button ( uppermost device in upper panel) to make sure power is off. 2 turn off water (I usually turn off the cold water main to stop water cross feeding into hot supply line back into heater) 3 disconnect the 2 wires on the lower element, test with continuity tester. shhould be no continuity between terminals and tank, but around 10 ohms between the 2 terminals. Check the thermostat for continuity if tank is cold thermostat should be closed ie zero ohms across the 2 terminals.
If stat is bad replace stat; disconnect wires push it up out of the spring clip insert new stat reconnect. If element is bad: drain tank. connect garden hose to tank drain valve, open tank drain valve turn water main on to clear rust sediment and get water flowing. Next remove filter screen from a hot water faucet then turn on ( a hot faucet upstairs or higher than tank drain). Now turn water main off, air will now go in through hot faucet and tank will drain, takes about an hour. Use a water heater element wrench about$10 to remove element(s) make sure no bits of rubber gasket are left in element opening- dig em out with a screwdriver if needed. Insert new element with its gasket and tighten. reconnect wires DO NOT TURN ON ELECTRICITY! BE SURE TO FILL WATER HEATER WITH WATER ! Turn water main back on -air will come out of the hot faucet for several minutes. When water runs without any air sputtering, turn off faucet and replace the faucet filter screen. check element(s) for leaks. turn breaker back on.

Feb 17, 2010 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

1 Answer

I have change the bottom heatern and the bottom thermostat but the bottom heate do not have current even if the top heater and thermostat have current.


There will be no current to bottom element until top element shuts off. then top thermostat will send current to bottom element only after the top half of the water heater has heated up and shuts off current to top element. Only one element at a time can be on. If current still does not go to bottom AFTER top element shuts off, the top stat could be bad.

Dec 28, 2009 | Water Heaters

1 Answer

I had a water heater that stoped heating. I checked and found the top elment to be bad and replaced it. I have since replaced the bottom lement and the top thermostat and the ohm meter to the thermostat...


WHEN THE ELEMENTS R OHM'ED OUT, THEY SHOULD READ "0", INDICATING THERE IS CONTINUITY. ANY OTHER READING IS A FAULTY ELEMENT. U CAN ALSO OHM THE T-STAT 2 SEE IF THAT IS OR ISN'T THE PROBLEM AS WELL.

Dec 14, 2009 | Rheem Water Heaters

1 Answer

I think I need to drain/flush our hot water heater


hi first making sure not to burn yoursel switch of heater and drain down down water from taps this may result in causing an air lock dont worry ! at the base of the heater you have the stat and element housing first withdraw the stat then the element alowing any remaining water to drain when fully drained turn on your water supply to flush out and clean replace element and stat using plummers sealent or tape hope this helps

Nov 16, 2009 | Rheem 50 Gallon FVR NATGAS Water Heater...

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