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Old 08-03-2014, 06:38 AM   #1
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Electric water heater element....


This post is just for general knowledge, just a service call I went to and how I resolved the problem....

Problem was a point of use electric water heater, 120 volt / 1500 watt element not working. Tested the element, and found that to be the culprit. Now, my next problem was I brought with me some random replacement elements, but I didn't have a 120v element, but I did find a 208v /4500w element, after some basic ohms law calculations, this element would draw around 1440 watts, not a bad replacement for a water heater with limited demand.

This is just a temporary replacement until the guy purchases a new water heater, but glad I was able to get him up and running with the limited options I had at hand.
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Old 08-03-2014, 06:45 AM   #2
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Originally Posted by stickboy1375 View Post
This post is just for general knowledge, just a service call I went to and how I resolved the problem....

Problem was a point of use electric water heater, 120 volt / 1500 watt element not working. Tested the element, and found that to be the culprit. Now, my next problem was I brought with me some random replacement elements, but I didn't have a 120v element, but I did find a 208v /4500w element, after some basic ohms law calculations, this element would draw around 1440 watts, not a bad replacement for a water heater with limited demand.

This is just a temporary replacement until the guy purchases a new water heater, but glad I was able to get him up and running with the limited options I had at hand.
Excellent post Ive done it before with AHU heater coils, once you know how the math you win every time.
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Old 08-03-2014, 06:47 AM   #3
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Excellent post Ive done it before with AHU heater coils, once you know how the math you win every time.
I had a helper with me that looked at me like I had two heads....
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Old 08-03-2014, 06:59 AM   #4
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I had a helper with me that looked at me like I had two heads....
Just make sure you tell him it only works for a pure resistance. Inductive loads would be bad
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Old 08-03-2014, 07:01 AM   #5
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Just make sure you tell him it only works for a pure resistance. Inductive loads would be bad


Ha, very bad.
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Old 08-03-2014, 11:31 AM   #6
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I've done this too......more than once.......and not just water heaters........

Actually, this has increased the longevity of the element because it now has a lower watt density (there's more surface area to dissipate the heat) and the resistor inside will run cooler.

One possible problem here is that the 4500W 240V element might be too long to fit in the tank.
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Old 08-03-2014, 11:37 AM   #7
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Originally Posted by micromind
I've done this too......more than once.......and not just water heaters........ Actually, this has increased the longevity of the element because it now has a lower watt density (there's more surface area to dissipate the heat) and the resistor inside will run cooler. One possible problem here is that the 4500W 240V element might be too long to fit in the tank.

Yes, I had 240/ 4500 w elements, and they were too long, that's why I went with a 208/ 4500w element, fit perfect.
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