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I drained the tank and I replaced both heating elements and both thermostats. It doesn’t fix this issue. The water is just warm. Not hot and runs out in 10 minutes. What’s wrong. The water heater is over 10 years old. I noticed sediment coming out when I drained it. I recently purchased a washer, could this possibly drain the hot water by not closing off the hot water supply?

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    How long did you let it heat up before testing the water temperature? Washer would have no effect except when you use it on a hot or warm cycle - if it drained hot water all the time you would know it (I hope...) Nov 19, 2023 at 19:58
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    It sat overnight heating up Nov 19, 2023 at 20:02
  • What are the thermostats set at? You did fill and bled the air out of the tank before turning it on?
    – crip659
    Nov 19, 2023 at 20:02
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    Where are you testing the water? Most newer houses have anti-scalding valves at sinks/tubs to prevent burning skin. A single valve might have failed, but a few different ones should not fail at the same time.
    – crip659
    Nov 19, 2023 at 20:08
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    Could it be the dip tube? Nov 19, 2023 at 21:19

1 Answer 1

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It could be the dip tube.

The dip tube is intended to send cold water coming into the tank into the bottom of the tank, while hot water is withdrawn from the top. If the dip tube is cracked, broken or dislodged and fallen into the tank, then cold water entering the tank remains near the top of the tank and mixes with hot water, yielding just warm water.

If you remove the cold water connection, you should be able to look into the tank and see the dip tube and probe it with a piece of wire. If it is missing, cracked or short, this is the cause of your problem.

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  • seen hot water put into the bottom of a cold tank - when water was demanded from the top - it came out hot - very hot at the temperature the hot was entering at the bottom. There was no "mixing" at all. Water is a funny thing - stratification and not mixing are normal.
    – Solar Mike
    Nov 20, 2023 at 6:33

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