Not enough water

Discussion in 'Water Heaters and Softeners' started by Hoosierjtf, Oct 25, 2018.

Help Support Plumbing Forums by donating:

  1. Oct 25, 2018 #1

    Hoosierjtf

    Hoosierjtf

    Hoosierjtf

    New Member

    Joined:
    Oct 25, 2018
    Messages:
    3
    Likes Received:
    0
    Location:
    Indiana
    I recently replaced the pressure relief valve and now the hot water runs out much faster. There seems to be only half the hot water as before. What may be causing this?
     
  2. Oct 25, 2018 #2

    ExtraMilePlumbing

    ExtraMilePlumbing

    ExtraMilePlumbing

    Well-Known Member

    Joined:
    Aug 21, 2014
    Messages:
    471
    Likes Received:
    77
    Location:
    ,
    temperature and pressure relief valve?the one on the water heater?did you set it at the same temperature as when before?youre not confusing it with a pressure reducing valve right?need pics and more info
     
  3. Oct 25, 2018 #3

    Hoosierjtf

    Hoosierjtf

    Hoosierjtf

    New Member

    Joined:
    Oct 25, 2018
    Messages:
    3
    Likes Received:
    0
    Location:
    Indiana
    Yes the temp/pressure relief valve. It is on the top, has a copper pipe attached down to the floor. It was leaking, now it's not after changing. I did turn the temp down because it was too hot. How can turning the temp down reduce the amount of hot water? We used to be able to fill the entire bath tube with hot water now only about half.
     
  4. Oct 25, 2018 #4

    ExtraMilePlumbing

    ExtraMilePlumbing

    ExtraMilePlumbing

    Well-Known Member

    Joined:
    Aug 21, 2014
    Messages:
    471
    Likes Received:
    77
    Location:
    ,
    lol that's youre answer . if you have an old 40 gallon tank that you never flushed that 40 gallon becomes 30 gallon(space is filled up with sediment/broken dip tubes and cold water tube broken leading to only half the tank heating up ,I recommend flush it out,turn heat back up and if leak continues get yourself a new heater or replace gas control valve
     
    SHEPLMBR likes this.
  5. Oct 25, 2018 #5

    Hoosierjtf

    Hoosierjtf

    Hoosierjtf

    New Member

    Joined:
    Oct 25, 2018
    Messages:
    3
    Likes Received:
    0
    Location:
    Indiana
    I'll try that. Thanks
     
  6. Oct 25, 2018 #6

    voletl

    voletl

    voletl

    Well-Known Member

    Joined:
    Dec 18, 2014
    Messages:
    535
    Likes Received:
    161
    Location:
    New York
    You just said the reason.... you're running out of hot water because you turned down the temperature.

    Believe it or not turning down water temperature reduces the amount of hot water you get.......

    If you have your water heater set at a very high temperature the new water entering will mix with the very hot water and we'll still produce tempered water that requires less time and less energy to heat up giving you plenty of hot water or as lowering the temperature on your water heater the water in the tank now is warm somewhat but as you start using it and new cold water enters all that water becomes tempted or cool and takes a lot longer and a lot more energy to heat up and now gives you no hot water if you want to go back to filling up a bathtub with hot water....turn that temperature back up or replace the water heater with one with a better re overy time.
     
  7. Oct 25, 2018 #7

    Jamesplumbing06

    Jamesplumbing06

    Jamesplumbing06

    Well-Known Member

    Joined:
    Feb 24, 2016
    Messages:
    523
    Likes Received:
    102
    Location:
    ,
    So did you turn both thermostats to new temp? Top and bottom. Tiny bit higher on bottom.
     
  8. Oct 30, 2018 #8

    Diehard

    Diehard

    Diehard

    Well-Known Member

    Joined:
    Aug 19, 2017
    Messages:
    453
    Likes Received:
    103
    Location:
    North reading, Mass.
    Thought they say tiny bit higher on top.???????:D
     
  9. Oct 30, 2018 #9

    Jamesplumbing06

    Jamesplumbing06

    Jamesplumbing06

    Well-Known Member

    Joined:
    Feb 24, 2016
    Messages:
    523
    Likes Received:
    102
    Location:
    ,
    I think of it as if bottom chamber is warmer then heat rises. So it helps keep the top chamber satisfied. And when the cold water shoots to bottom to push the top out. The bottom mixing chamber begins hotter so helps keep it even temp and as the bottom chamber cools down. The bottom element begins the cycle. So why not start higher on bottom. Less likely to have cold drift down and cause bottom one to reheat causing hot spots. This does work your bottom element more. But when it pops you still have hot water for half the time. If you over work your top element then when it pops you got nothing. They are going to burn out. I want my bottom one out first. The wife can shower and get gone then I can fix it. And state says to not let top thermostat be set higher than lower
     

    Attached Files:

  10. Oct 31, 2018 #10

    Jamesplumbing06

    Jamesplumbing06

    Jamesplumbing06

    Well-Known Member

    Joined:
    Feb 24, 2016
    Messages:
    523
    Likes Received:
    102
    Location:
    ,
    Lockinvar too. Really just shooting from the hip. But kinda like it when a book backs up
     

    Attached Files:

  11. Oct 31, 2018 #11

    Jamesplumbing06

    Jamesplumbing06

    Jamesplumbing06

    Well-Known Member

    Joined:
    Feb 24, 2016
    Messages:
    523
    Likes Received:
    102
    Location:
    ,
  12. Oct 31, 2018 #12

    Jamesplumbing06

    Jamesplumbing06

    Jamesplumbing06

    Well-Known Member

    Joined:
    Feb 24, 2016
    Messages:
    523
    Likes Received:
    102
    Location:
    ,
    O my. Youtube idiots are the “they” you speak of. They think hot water sinks down to warm the bottom chamber too. Lol you tube and head thumping daddys are the hardest to reverse their logic. :D
     
  13. Oct 31, 2018 #13

    Diehard

    Diehard

    Diehard

    Well-Known Member

    Joined:
    Aug 19, 2017
    Messages:
    453
    Likes Received:
    103
    Location:
    North reading, Mass.
    Yeah...I looked at two YouTube videos and they both said the same thing. I believe the logic was that heat rises from the lower element adding to the upper. I can understand that, however, like you pointed out I think it makes a lot of sense to hit that cold water as it's entering the bottom. ;)
    Yes I have much more confidence with information received from the manufacturers.
     
    Jamesplumbing06 likes this.

Share This Page