(206) 949-5683, Top Rated Plumber, Seattle
Page 1 of 2 12 LastLast
Results 1 to 15 of 18

Thread: Hot water doesn't last

  1. #1
    DIY Junior Member bajaboy1's Avatar
    Join Date
    Nov 2012
    Location
    KY
    Posts
    9

    Default Hot water doesn't last

    I know this question has been asked many times, but the solutions haven't helped me as of yet.
    Culprit: 2001 AO Smith gas 40 gallon water heater.
    Problem: Hot water only lasts about 10 gallons. Luke warm after 11 and getting cold at 12.

    I've cleaned the tank.
    I've replaced the dip tube (which was fine).
    I buttoned up the air so I have no leaks, have a nice blue flame.

    Any advise appreciated.
    Last edited by bajaboy1; 11-13-2012 at 07:10 PM. Reason: spelling

  2. #2
    DIY Junior Member bajaboy1's Avatar
    Join Date
    Nov 2012
    Location
    KY
    Posts
    9

    Default

    To add.
    Water heater turns back on after 5 gallons used.
    Thanks

  3. #3
    DIYer, not in the trades LLigetfa's Avatar
    Join Date
    Feb 2011
    Location
    NW Ontario, Canada
    Posts
    3,675

    Default

    Quote Originally Posted by bajaboy1 View Post
    Culprit: 2001 AO Smith gas 40 gallon water heater..
    That puts it at 11 years old. Maybe it looks like this on the inside.


  4. #4
    DIY Junior Member bajaboy1's Avatar
    Join Date
    Nov 2012
    Location
    KY
    Posts
    9

    Default

    I suppose it could! I've flushed it since new a few times a year though.

  5. #5
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    Location
    New England
    Posts
    21,381

    Default

    Last guy that had this problem found a leak in the pipes under the house. It doesn't take much to minimize the hot water available. Do you get warm water at any other faucets in the house? A defective faucet that's creating a cross-over can limit the amount of hot water available, too.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  6. #6
    DIY Junior Member bajaboy1's Avatar
    Join Date
    Nov 2012
    Location
    KY
    Posts
    9

    Default

    No leaks anywhere. It happens at any shower or faucet in the house. Should the water heater turn on sooner?
    Last edited by bajaboy1; 11-14-2012 at 02:58 AM.

  7. #7
    DIY Junior Member bajaboy1's Avatar
    Join Date
    Nov 2012
    Location
    KY
    Posts
    9

    Default

    Could the temp probe be scaled up or bad causing issues? Only thing I haven't checked or changed.
    Last edited by bajaboy1; 11-14-2012 at 03:56 AM.

  8. #8
    In the Trades Gary Swart's Avatar
    Join Date
    Sep 2004
    Location
    Yakima WA
    Posts
    7,245

    Default

    While just replacing things on the chance that that piece/part might be the problem isn't a very sound method, in this case, an 11 year old water heater is likely about served out its life anyway. The A O Smith is not a favorite heater among the plumbers on this forum, so that might also be a good reason the get a new heater. If that doesn't fix the problem, then of course you'll have to look elsewhere, but the heat is really about due anyway.

  9. #9
    DIY Junior Member bajaboy1's Avatar
    Join Date
    Nov 2012
    Location
    KY
    Posts
    9

    Default

    I thought they were good till they start leaking, rusting out. What else goes bad on the inside to prevent heating up? And thanks all.
    And what brand do you recommend?

  10. #10
    DIYer, not in the trades LLigetfa's Avatar
    Join Date
    Feb 2011
    Location
    NW Ontario, Canada
    Posts
    3,675

    Default

    Quote Originally Posted by bajaboy1 View Post
    What else goes bad on the inside to prevent heating up?
    Did you not see the pic I posted?

  11. #11
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    Location
    New England
    Posts
    21,381

    Default

    Mineral deposits can deplete the volume and act like a big insulator. The 'average' WH probably only lasts 6-8 years. Yes, some can last much longer than that, but for practical purposes, at 11, if it's not working properly, it probably isn't worth mucking with. FWIW, often, the only difference in a longer warranty is (maybe) a better sacrificial anode and the warranty...it's often the same tank, you're only paying the insurance betting it won't last that long.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  12. #12
    DIY Junior Member bajaboy1's Avatar
    Join Date
    Nov 2012
    Location
    KY
    Posts
    9

    Default

    See the pic.Didn't think that was "normal" when you take care of it.
    So I need a new one. Mine has the power vent on it, no chimney. I suppose this is just a regular water heater with the power vent, correct? Can be reused on another heater?
    Thanks again
    Last edited by bajaboy1; 11-16-2012 at 05:33 PM.

  13. #13
    Jack of all trades DonL's Avatar
    Join Date
    Mar 2011
    Location
    Houston, TX
    Posts
    3,637

    Default

    Quote Originally Posted by bajaboy1 View Post
    I know this question has been asked many times, but the solutions haven't helped me as of yet.
    Culprit: 2001 AO Smith gas 40 gallon water heater.
    Problem: Hot water only lasts about 10 gallons. Luke warm after 11 and getting cold at 12.

    I've cleaned the tank.
    I've replaced the dip tube (which was fine).
    I buttoned up the air so I have no leaks, have a nice blue flame.

    Any advise appreciated.
    If the water comes out Hot in the first place then it must be heating.

    The mixing of cold coming in to hot going out will affect the Output Temperature.

    The gas will not heat the water as fast as you can use it with Hot wide open.

    Most people add some cold water to the hot and can take a normal shower.

    If your recovery is slow, than that is a different problem.

    Maybe your thermocouple is out of gas.

    May be time for a new heater.
    Theory only works perfect in a vacuum.

    Cyber Security Protection for Windows C:\ > WWW.WinForce.Net

  14. #14
    DIY Junior Member wassermeister's Avatar
    Join Date
    Aug 2012
    Location
    portland, OR
    Posts
    24

    Default

    It may not be your water heater after all that's causing the issues. What are your water pipes made of? If you have galvanized pipes or are using well water you may have junk in the pipes that restrict proper flow.
    Efficiency nerd. I like to keep my money in my pockets.
    Energy efficiency and water conservation aspects should be automatically incorporated into product design.

  15. #15
    Plumber jimbo's Avatar
    Join Date
    Aug 2004
    Location
    San Diego
    Posts
    9,001

    Default

    Quote Originally Posted by bajaboy1 View Post
    . I suppose this is just a regular water heater with the power vent, correct? Can be reused on another heater?
    Thanks again
    Oh NO NO NO! A power vent water heater is built and UL listed as such. It will cost you more. NEVER attempt to modify a WH in any way.,

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •