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Thread: suddenly water is hotter than normal, but runs cold after 8 min.

  1. #1
    DIY Junior Member Druski's Avatar
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    Default suddenly water is hotter than normal, but runs cold after 8 min.

    We have a 12 y.o. electric tank which just suddenly one day started heating the water hotter than normal, and it runs cold after an 8 minute shower. No other appliances were used prior and this is consistent since the problem began 4 days ago. No leaks. Any ideas?

  2. #2
    In the trades Dana's Avatar
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    Odds are the dip tube that directs the incoming water to the bottom of the tank has broken off near the top. Without the dip tube there less mixing, and the water becomes stratified with the hottest water at the top (which is well above the heating element's thermostatic sensor.) That stratification makes the initial slug of water coming off the top of the tank pretty hot. But since the cold water is being injected at the top of the tank it's short-circuiting most of the water in the tank, making the exiting water temp drop fairly rapidly.

    It's sometimes worth replacing the dip tube if it comes out cleanly. But in your in your case it's probably only as a DIY: A 12 year old unit it could be on it's last legs anyway, better to pay the pro to install a new unit than the travel time & labor just to swap out dip tube to get another coupla years out of it.

  3. #3
    Jack of all trades DonL's Avatar
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    I would suspect a bad / shorted element.


    Good luck.
    Theory only works perfect in a vacuum.

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  4. #4
    DIY Senior Member JerryR's Avatar
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    Hard to tell without taking some voltage and resistance readings

    Another cause could be a defective upper thermostat failing to switch to the lower element. This would heat the upper portion of the heater only. After the hot water is drawn off the top then the cold water from the lower tank exits.

    It could also be a defective lower element or defective lower thermostat.

    It can be tricky and confusing to troubleshoot if you are not comfortable using a volt/ohm meter.

    JR
    JR

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