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Learned the hard way fixing Electric water heater! #4658224
02/06/18 05:45 PM
02/06/18 05:45 PM
Joined: Mar 2008
Posts: 5,943
Michigan
ZZman Offline OP
ZZman  Offline OP
Joined: Mar 2008
Posts: 5,943
Michigan
Mother in laws electric water heater quit. I bought a kit that included both elements and upper and lower thermostats.

The install was surprising easy. My big mistake was not reading the instructions. I did not totally fill the water heater and bleed the air out of the pipes before I turned on the power. The upper element burnt out.... Live and learn.


2003 Mercury Grand Marquis. Rotella T6 Multi-Vehicle oil
2008 Sebring Hardtop convertible. Rotella T6 Multi-Vehicle oil
2006 Kawasaki Vulcan 900 LT. Amsoil Metric 10w-40
Re: Learned the hard way fixing Electric water heater! [Re: ZZman] #4658233
02/06/18 05:59 PM
02/06/18 05:59 PM
Joined: Jun 2002
Posts: 18,223
Elizabethtown, Pa
Al Offline
Al  Offline
Joined: Jun 2002
Posts: 18,223
Elizabethtown, Pa
Yea unfortunately (for you) the upper Tstat controls which element gets the voltage and the upper element will be energized when filling the tank and while the tank is getttiong up to temp.


Re: Learned the hard way fixing Electric water heater! [Re: Al] #4658262
02/06/18 06:31 PM
02/06/18 06:31 PM
Joined: Oct 2017
Posts: 634
Georgia
MParr Offline
MParr  Offline
Joined: Oct 2017
Posts: 634
Georgia
Iíve never had that happen to me. My problem is our water here in SW Georgia. Lime and calcium buildup is terrible. I had a heck of a time getting my lower thermostat out the last time. I even drain the tank twice a year. Next time I have to replace the elements, I have a plan. I will drain the tank and close the valve. I will then pull the top element and pour 2 or 3 gallons of white vinegar in there and let it work. Then drain the vinegar and replace both elements.


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Re: Learned the hard way fixing Electric water heater! [Re: ZZman] #4658371
02/06/18 08:15 PM
02/06/18 08:15 PM
Joined: Jul 2004
Posts: 12,028
Middlesex County CT
simple_gifts Offline
simple_gifts  Offline
Joined: Jul 2004
Posts: 12,028
Middlesex County CT
Isn't the thread title more suited as "How many of you have burned up an appliance that belongs to your MIL?"

j/k

That sucks. I once tried changing a starter not thinking thru the significance of the 'fat cables'


2004 Prius; 97K ML Syn 5W-30
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Was driving an ox cart; Now on the USS Enterprise
Re: Learned the hard way fixing Electric water heater! [Re: ZZman] #4658381
02/06/18 08:23 PM
02/06/18 08:23 PM
Joined: Mar 2008
Posts: 5,943
Michigan
ZZman Offline OP
ZZman  Offline OP
Joined: Mar 2008
Posts: 5,943
Michigan
All good now after buying an upper element and following proper procedure.

You could definitely tell by looks that the upper had failed. It was a different color and the element had changed shape.

Last edited by ZZman; 02/06/18 08:25 PM.

2003 Mercury Grand Marquis. Rotella T6 Multi-Vehicle oil
2008 Sebring Hardtop convertible. Rotella T6 Multi-Vehicle oil
2006 Kawasaki Vulcan 900 LT. Amsoil Metric 10w-40
Re: Learned the hard way fixing Electric water heater! [Re: ZZman] #4658426
02/06/18 09:13 PM
02/06/18 09:13 PM
Joined: Sep 2015
Posts: 1,527
USA
mk378 Online content
mk378  Online Content
Joined: Sep 2015
Posts: 1,527
USA
Yes they can totally melt down when dry fired.

Seen this happen on two neighbors with mobile homes. The typical mobile home water heater has the cold inlet simply a pipe in the side of the tank near the bottom. Hot water comes out the top as with a regular heater. During a power failure when the well pump stops, it is easy for all the water to leave the tank through the cold water lines.

When power is restored, the element will burn out before the pump can refill the tank. It does not take long.


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