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I want to replace the upper and lower heating elements on an older modle water heater, MOR-FLO Model SD50. However when I removed the old theromstats expecting to see the screw out elements underneath the thermostat, there wasn't any there. I am at a loss as to what to do to repair this old tank. Any suggestions? Thank you.

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Re: I want to replace the upper and lower heating...

There are two types of elements. One uses a 1-1/4" socket and the other used 4-bolts. If your water heater is so old that you can not find replacement elements, do yourself a favor and replace the whole heater with something more efficient.

Posted on Dec 30, 2007

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Electric Water Heater Wiring Diagram

If you are changing a water heater thermostat on your hot water heater, or would just like to troubleshoot your hot water heater, you may want to know how it is to be wired.

Here is a diagram of the way a normal electric hot water heater with two elements that run non-simultaneous will be wired. This means that only one element at a time will be working and have power going to it. The top element will heat water until it is heated to your set point and then it will switch the power to the lower element to heat the bottom of the tank. This gives you some hot water quickly, and then heats the rest of the tank.


For more information on how to troubleshoot electric hot water heaters you can check out this tip.

on Mar 27, 2010 | Heaters

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I have a clogged fuel line (filter?) I do I remove the bushing without damaging it?


(For 40/55/60/70/110/115/155/165 Models


1. Remove side cover screws using 5/16" nutdriver.

2. Remove side cover.

3. Pull upper fuel line off fuel filter neck (see

Figure 15 or 16).

4. Carefully pry bushing, fuel filter, and lower

fuel line (110/115/155/165 Models only) out

of fuel tank (see Figure 16).

5. Wash fuel filter with clean fuel and replace in tank.

6. Attach upper fuel line to fuel filter neck.

7. Replace side cover.

Jan 20, 2012 | Reddy Heater-70,000 BTU Kerosene w/T'stat

1 Answer

How do I check my hot water element?

1)Locate the upper heating element in the top access. The heating element is above the thermostat, and all you will see is a round disc with two wires attaching to the disk.
  • 2)Set your ohm meter to the X1 or RX 1 scale to measure the continuity of the heating element. Touch each of the ohm meter probes to each of the terminal screws on the heating element. A positive reading indicates a good element. If there is no reading, the element is faulty.
  • 3)Test for a possible short in the heating element with the ohm meter. Touch one ohm meter probe to one of the heating element terminals. Touch the other ohm meter probe to the bracket that secures the heating element. If you get a reading of zero, the element is good. If there is any positive reading on the scale, the element is grounding itself and will require replacement.
  • 4)Test the lower heating element exactly as the upper heating element.
  • 5)Place the access doors back on the water heater tank, and secure them with the screws.

  • Good luck

    Dec 03, 2011 | Heaters

    1 Answer

    I have a Dimplex Ritz electric 2000w heater that is only working on the low 1000w setting. When the high setting is selected it auto turns off and there was a funny smell which I am assuming a fuse has...

    Yes, it can be repaired, if Dimplex still stocks that particular heating element. It's not to difficult to replace the heating element, just mark all the wires before removing the old one. Also, it will require removing the logs inside the heater, because you will need to turn the stove upside to do the removal and replacement. Contact Dimplex Technical Support at 1-888-346-7539.

    Hope this helps you.

    Jul 06, 2011 | Dimplex Compact Electric Flame Stove...

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    How old is my Coleman Evcon Furnace, Modle Number: DGAT056BDE? I can't seem to find a Manufacturing date sticker. It was claimed to only be a year old, now living here a year it would now be 2 years old. ...

    The Serial Number would really help in defining how old your Coleman furnace is. The model you have is used predominantly in manufactured housing. To find the Serial Number, you will need to remove the upper shroud of the furnace. There should be a sticker or plate on the back of that shroud of just inside the housing of the furnace, that will give you the Model # & Serial #. Armed with that, you can do a little detective work, as to it's age.

    Mar 03, 2011 | Coleman Heaters

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    I'm puzzled by what may be causing low heat output from a Markel wall-mounted 240V electric heater, new from around 1984; cannot find model number. I'm not sure of the wattage rating. The heater element...

    your element may have metered out but still may not getting as hot as it used too found this on my hot water cylinder, the hot water was only warm not hot like it should be so pulled out it meterwd fine but when i placed a new one in the cylinder and let the water heat up it was a lot hotter than it had been and now i can't get out of the shower but it was the element not heating as it should have and thats just old age i bet i don't run as hot when im old and it was nearly thirty year old heater, if it was new from 1984 it sounds like its had a full life i don't really expect heater to last more than thirty years well really more than twenty years anyway and a heater from the eighties couldn't have never been that efficient and **** a bit of power too i'd upgrade to at least a 2000 model heater you'll actually save money by buying a newer one!

    Nov 19, 2010 | TPI H3327TDRP Markel Electric Wall Mounted...

    1 Answer

    Worked last night, just blowing cold air today on both settings (1000 and 1500)

    There are a couple of things I would check. Some units like this have a seperate fuse for heating and fan.They should be located on back or lower portion on sides.Most of these have a black screw on cap. Unscrew cap to access fuse. Always remember to be safe and have heater unplugged before doing any checks or repairs. Most of the older units of this type use old style automotive fuses which are round with a glass center section.You can look at them and see if the wire or metal strip inside is seperated. If it is then fuse is bad and needs replaced with new fuse of same amp rating and size. The other thing is that the heating element is burned out. You can check this by removing front cover or grille and visually inspecting heating coils.Don't mean to sound negative but if it's much more than a fuse you're probably better off to just get a new one. Hope thishelps . Thanks

    Nov 04, 2010 | Patton PUH680-U Utility Heater

    1 Answer

    Some of the baseboard heaters don't get hot. It is an old (1970) boiler system. Is there somewhere on each individual unit to turn it on? I'm baffled, I just assumed the hot water would run through all of...

    No the water does not have to run through all of them....if you have what is known as a mono-flo system.
    With this type of system there are tees that divert some of the water to the radiator and some of the water bypasses and goes on to the nest radiator and so on....

    If you look on the radiators that are not getting warm or any of the rads for that matter you will see a silver bleeder valve. Some of these take a "key" to open and some just have a screw driver slot.
    If you open the beleeder you will probably get air out of the radiator. Leave the bleeder open till the valve spurts water out, then close it.
    Continue this until all the rads are full of water.
    If no air or water comes then your "fill Valve" on the boiler may be faulty and not allowing water into your system. You may need to replace that and then bleed the rads.....
    Bottom line.... air does no heating, the rads must be full of water to make heat. Air in the rads also air locks that loop in a mono flo system...thus no heat...
    Sometimes even after bleeding it can take sometime for the water to start flowing through a rad again... be patient...

    I hope that this will help you to solve your problem!

    Thanks for using Fixya!!


    Dec 14, 2009 | Heaters

    1 Answer

    I replaced the lower element last night and had hot water. Tonight I went to use the hot water and it was only slightly warm. Did the top element burn out or did it burn the thermostat out or did it burn...

    remove both elements and check continuity of both units,sometimes also the thermostat can go bad from age,also make sure you have 240volts from main panel in house,if you lose 1 leg i.e. 120 volts the heater wont work properly without 240volts

    Apr 20, 2009 | Heaters

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