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Anonymous
Anonymous asked in Home & GardenMaintenance & Repairs · 2 months ago

why does my water heater run out of hot water so fast?

Update:

it can be at a low setting or high, right now it is hot enough to burn your hand but a shower still gets colder the longer your in it and generally is a stable "warm" in about 15 minutes.  it is brand new(about 6-8 months old) and the burner kicks on right aawy so i don't think its the dip tube

Update 2:

Also, my old one which was replaced because significant sediment buildup never had this issue

Update 3:

it is gas and is the same size as the old one. Heats water for the whole house, other appliances aren't running when I shower 99% of the time

10 Answers

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  • 2 months ago

    If the new one is the same size as the old one then the most likely culprit is the control system.. For some reason it is not heating the full tank to the temperature setting.

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  • 2 months ago

    the tank is too small for your needs 

    • Edwena
      Lv 7
      2 months agoReport

      Showers are too long.

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  • DEBS
    Lv 7
    2 months ago

    Based on experience working with a similar issue with a professional, the heating elements are the first things to check/replace.  There is more than one so that the water in the top and bottom of the tank is both heated evenly.  If you're only heating part of the tank, then you'll get lukewarm water pretty quick, and it will stay lukewarm for a decent amount of time.  It being new seems odd it would burn out so quickly, but it's possible.  

    If you weren't living in the house and had it winterized over the last few months, make sure that all water sources are turned off.  This is actually what happened to on our side.  We were at a vacation rental which had been winterized.  One outdoor faucet in an bathroom accessed from the outside only and never used was running.  The tank was working overtime to keep up with the hot water it was throwing out.  It could keep up as long as it was the only output being used.  As soon as a shower was taken, it was lukewarm, at best, after just a few minutes.

    • SumDude
      Lv 7
      2 months agoReport

      Paragraph 1 would be true if it was ELECTRIC but "burner" implies gas. We need clarity.

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  • Edwena
    Lv 7
    2 months ago

    You probably have a water heater with 2 elements and one of them is burned out. You can replace the element, but if the heater is years old and easy to remove, buy a new one and have a new water heater put in. Now, you might have a problem in some places with the epidemic rules. So that complicates your situation. You may have to buy an element through the mail and replace it yourself.

    • ...Show all comments
    • Edwena
      Lv 7
      2 months agoReport

      And, if it is a new heater, are you sure you have the thermostat set correctly?  Read the instructions.  There may be a button to push or a dial to turn to get it like you want it.  You might have it in "energy saver" mode.

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  • 2 months ago

    the 'usual' reason is that the tube inside that forces added water to the bottom has corroded and broken off. This can be fixed -- it's a DIY or handyman job [see youtube for how to do it]; and probably will require turning water off and draining the hot water heater in order to both get at the top cold water entry and install the replacement tube [which is near as long as the hot water heater is tall].

    Of course, you should check the thermostats and heating elements first [with multimeter] ... some have two [upper and lower] thermostats and if one of them is off, the volume of hot water might be meager.

    Source(s): grampa
    • SumDude
      Lv 7
      2 months agoReport

      That would be true if it was ELECTRIC but "burner" implies gas. We need clarity.

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  • JimTom
    Lv 4
    2 months ago

    Is it the same size as the old one? it could be that only the element closest to the outlet of the cylinder is working and the other one isnt, meaning as the water from the opposite end where the dud element is gets pumped out, that water is cold (not warmed up as well). Have both elements checked (thats if it has 2, like most)

  • 2 months ago

    Why be Anonymous?  We do not negatively judge or shame people with faulty HWT's.  Are you a newbie (0/0) just making up this fake question? {Real people identify gas or electric.} Dip tube has nothing to do with heat.  If burner = gas idk.  If it was ELECTRIC then I would say you had a faulty lower heating element - so get it fixed under warranty.

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  • 2 months ago

    maybe its broken, maybe you should hire someone to fix it

    • JimTom
      Lv 4
      2 months agoReport

      No

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  • 2 months ago

    many reasons how old is it? gas or electric?is it a thirty gallon ?probably smaller

    when you say "so fast " how fast?

    • kelly2 months agoReport

      the burner should not kick in right away, the supply and the hot water may be switched

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  • Anonymous
    2 months ago

    You use it up too fast, I suspect.

    • Nuff Sed
      Lv 7
      2 months agoReport

      Or, there isn't enough to start with, or the machine isn't correctly installed and adjusted, or the tempering valve is broken, or any number of other reasons.

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