Water Heater Issue

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by jigarlakhani, Apr 15, 2006.

  1. jigarlakhani

    jigarlakhani New Member

    Messages:
    12
    Hello:

    I have a 5 year old Rheem Waterheater self cleaning water heater (40Gallon) and we started noticing issues with hot water. Initially we get hot water but after 20 mins of showeriing we get cold water. I called a plumber and he changed the valve adjuster on the faucet but that didnt do anything for us.

    i am having some guests over and i need some help figuring out what the issue might be?

    Jigar
  2. Cass

    Cass Plumber

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    Is it gas or electric?
  3. Bob NH

    Bob NH In the Trades

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    Twenty minutes of showering is about the limit with a 40 gallon hot water heater. You will get noticable mixing after about 30 gallons, so 1.5 GPM of hot will last about 20 minutes. You will also find that you don't get as much usable shower time if your water supply is colder in the winter. You will get a bit faster recovery if it's gas but that won't help the 20 minute shower problem.

    When your guests are coming, crank up the heater temperature to about 160 or 170 F about 8 hours before they arrive. Warn them of hot water if you don't have a tempering valve on the outlet of your heater.
  4. plumber1

    plumber1 Plumber

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    hot

    We all have to consider the other person.

    I would tell everyone to limit the shower to 5 min.

    If you want longer showers, spend the money and get a high recovery water heater.......
  5. hj

    hj Moderator & Master Plumber Staff Member

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    Wh

    A domestic water heater can only be adjusted to 150 degrees. And even that is too hot, even if you warn them and they forget.
  6. Bob NH

    Bob NH In the Trades

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    From the Thermodisc site:

    • The 59T is adjustable over a range of 110F (60C). Lowest calibration is 90F (32C) and the highest is 200F (93C).

    It is not be good practice, but they can usually be set higher than 150. Added hot water capacity can be obtained by increasing the temperature and using a thermostatic tempering valve.
  7. Cass

    Cass Plumber

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    Location:
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    You may have a bad dip tube. Electric or gas.

    If gas you may have a bad gas valve temp sensor.

    If electric you may have a bad thermoustat and or burned out element.
  8. 20 minute showers....huh??

    Either get a bigger water heater or

    just stop playing with that bar of soap so much.....

    EVERYTHING should be "spankey" clean after only a few minutes...

    what kind of soap are you useing??l
    Last edited: Apr 16, 2006
  9. hj

    hj Moderator & Master Plumber Staff Member

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    t'stat

    Now you're going to make me check a water heater to see if it has the 59T 'stat. Historically, residential heaters had a thermostat that went from about 80 to 150, 160 max, for safety and liability reasons. Then they started using letters for the settings because the numbers were not always accurate and customers would get upset when the water was hotter or cooler than the degree set on the thermostat. These days, most heaters come with the thermostat set a the minimum point and require the plumber or installer to set it to the desired temperature. And since the "B" setting is about 130 degrees, I do not see how turning it to the "C", hottest setting, could bump it up to 200 degrees, but I will have to check it out tomorrow to see how far above "C" it will turn.
  10. jigarlakhani

    jigarlakhani New Member

    Messages:
    12
    Hi Guys - Thanks for your response. Actually this is a Rheem gas waterheater. I have notice we get less and less hot water in a single shower and this at times is after 10 - 15 mins of shower.

    I am worried because this is a 5 year old waterheater and Rheem isnt giving me much response. I thought the diptube issue was with older water heaters?

    so could the issue still be diptube or the gas valve temperature sensor?

    I have no plumbing experience. how do i find the right plumber?
    pls advice.

    thanks.
  11. jigarlakhani

    jigarlakhani New Member

    Messages:
    12
    If i remember correctly we also removed the reducer because my wife was complaining about the water pressure..If i add it back on will that do it?
    Can i get the reducer from anywhere?
  12. Cass

    Cass Plumber

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    Location:
    Ohio
    When you call, ask them if they carry dip tubes on their truck because you think that may be the problem
  13. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

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    Without a reducer in the showerhead, it is anyone's guess how much water you are using per minute. Stick a pail under it and measure how much per minute. My guess, without a restrictor in the head, you might be using 5-6 gallons per minute or maybe even more. With a 40-gallone tank, what do you expect? 10-minutes could easily be 50 gallons.
  14. jk60

    jk60 Engineer

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    Location:
    San Francisco
    I think a good first step would be to check the temperature of the water in the heater. Wait until the heater kicks in and at the end of the heat cycle drain some water from the heater into a container. Stick in a meat thermometer in the water and see if the water temperature corresponds to the setting on the thermostat.

    Good luck!!!
    Last edited: Apr 17, 2006
  15. dubldare

    dubldare Plumber/Gasfitter

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    Location:
    MN/ND

    The 59T is an electric wh stat.


    The ECO (electronic cut-off) in the vast majority of residential gas water heaters (with standard, immersion type gas control/thermostat) is set at 160 degrees. The ECO is non-resetable. If it reaches 160, the entire control must be replaced. The 160 degree setting is because of the thermostats position (low on the tank) and temperature stratification in the tank, as well as end-user safety.
  16. dubldare

    dubldare Plumber/Gasfitter

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    286
    Location:
    MN/ND
    A simple dip tube test, found on AO Smiths website: www.hotwater.com

  17. plumber1

    plumber1 Plumber

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    Also you can start running hot water at a faucet and grab the hot water outlet and see how soon the pipe gets cold.
  18. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

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    Location:
    New England
    If he is running a showerhead WITHOUT a restrictor (he said he took it out), at least to me, that is the reason he runs out of hot water in 10 minutes or so...I think the HWH is fine...it is only a 40-gallon, not even a high recovery unit.
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