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Thread: Is This the Element(s)?

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  1. #1
    DIY Junior Member Mom to Evan's Avatar
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    Default Is This the Element(s)?

    An older State water heater came with the home we bought last year. Up until yesterday, it put out a steady amount of reasonably hot water, but it seemed that an element replacement was in our future... Then yesterday morning when I went to bathe my son, the water came out EXTREMELY hot and I had to go from adjusting the faucet from near the hottest setting to the middle just to get a reasonable temperature. My husband and I then each took showers after this.

    When we returned to the house in the afternoon, there was absolutely no hot water whatsoever. Now we're contemplating replacing the elements vs. replacing the unit. The heater does not leak (so far) and it has a timer unit on top from Home Depot that was put on by the previous owner.

    Does this sound like something that an element change will fix, or should we be scraping the money together for a new unit?
    Thank You!

  2. #2
    General Engineering Contractor ballvalve's Avatar
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    With an Ohmmeter and ammeter you can quickly test the elements in the tank.

    But it sound likes your 8$ temperature switch is bad. There is usually a reset button on them on top and one bottom. Dont 'HOLD" them in.

    A dying element does not 'overheat'.

  3. #3
    Moderator & Master Plumber hj's Avatar
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    auote; A dying element does not 'overheat'.

    Oh, but they can and DO overheat.

    One of the elements, (usually the bottom or maybe both), is burned out, but in such a way that it is ALWAYS heating, therefore the temperature of the water keeps increasing, giving you the extremely hot water, until the thermal overload button pops out, at which time the entire system shuts down, which is why you then have NO hot water. Adjusting the thermostats does NOTHING to prevent the problem. Call a plumber to have the heater checked and repair the part(s) which have failed.
    Licensed residential and commercial plumber

  4. #4
    General Engineering Contractor ballvalve's Avatar
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    How can an element, broken or not continue heating unless the temperature switch is bad?

  5. #5
    DIYer, not in the trades LLigetfa's Avatar
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    I have not worked on an electric water heater in decades but back then they used only a single pole thermostat to cut power to the element. If the element shorted to ground, since the neither side of a 240V circuit is at ground potential, the element could heat the water continuously despite the thermostat being open. Back then I wondered why they didn't use double pole switches.

  6. #6
    General Engineering Contractor ballvalve's Avatar
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    I have bucketfulls of bad electric elements, and they typically blow a hole through the sheath, and sometimes continue heating at a greatly reduced rate in spite of the exposure to water- without tripping the breaker. That is a mystery for our JW over at the electric forum

    But cut the power to any one of the lines [i.e the temp switch] and I guarantee that no more heating will occur.

    Another failure mode is just an internal breakage of the resistance wire, and the result is simply no heat and no blown breaker.

    A true short to ground will trip the breaker. If you guys have some more explanations, I would like to hear it.

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