hot water heater

Discussion in 'Plumbing Forum' started by tuffy, Nov 26, 2017.

Help Support House Repair Talk by donating:

  1. Nov 26, 2017 #1

    tuffy

    tuffy

    tuffy

    well-known member

    Joined:
    Oct 25, 2017
    Messages:
    320
    Likes Received:
    135
    Location:
    kirksville missouri
    I have a reliance 501 hot water heater model 64020RS with 2 4500watt heating elements and only 1 thermostat which is on the bottom element. Problem is we have to keep the thermostat at the lowest setting or the pressure relieve valve pops off. which gives us almost no hot water. would this be the thermostat or pressure relieve valve?
     
  2. Nov 26, 2017 #2

    JoeD

    JoeD

    JoeD

    Well-Known Member

    Joined:
    Mar 16, 2006
    Messages:
    1,658
    Likes Received:
    309
    The thermostat seems to be working since adjusting it lowers the temp.
    It could be the TPR valve or you could need a pressure tank. When water heats up it expands. If you have a pressure reducing valve(PRV) the pressure of the water in your will rise.
     
    tuffy likes this.
  3. Nov 26, 2017 #3

    tuffy

    tuffy

    tuffy

    well-known member

    Joined:
    Oct 25, 2017
    Messages:
    320
    Likes Received:
    135
    Location:
    kirksville missouri
    What is a pressure tank? Is that what the TPR goes into? In that case I need a new water heater? I don't have a PVR.
     
  4. Nov 26, 2017 #4

    joecaption

    joecaption

    joecaption

    Well-Known Member

    Joined:
    Jan 8, 2011
    Messages:
    2,294
    Likes Received:
    380
    Here is a picture of how a pressure tank would be plumbed in.
    https://www.anthonyphc.com/kansas-city-water-heaters/
    If it mine I'd start by removing and replacing the TPR valve with an exact replacement.
    Most have a tag on them making it simple to find the right one.
    Shut off the incoming water, shut off the heater, open up any hot water side of a faucet to lower the pressure, leave it open, then connect a hose up to the valve to the drain valve on the bottom of the tank and let it drain for about a min. (there is 0 need to drain the whole tank!)
    Remove and replace the valve.
    Once changed open up the main water valve first, let the water run out of that open faucet valve until you get a steady flow of water, then turn the heater back on.
     
  5. Nov 26, 2017 #5

    JoeD

    JoeD

    JoeD

    Well-Known Member

    Joined:
    Mar 16, 2006
    Messages:
    1,658
    Likes Received:
    309
    If you don't have a PVR then the TPR could be defective. They should cost less than $20 so I would try replacing it.
     
  6. Nov 26, 2017 #6

    tuffy

    tuffy

    tuffy

    well-known member

    Joined:
    Oct 25, 2017
    Messages:
    320
    Likes Received:
    135
    Location:
    kirksville missouri
    I will go out and get a TPR.thanks for all your help.Joecaption thanks for the picture now I know what a PVR is and thank you for the play by by play of changing it.
     
  7. Nov 27, 2017 #7

    joecaption

    joecaption

    joecaption

    Well-Known Member

    Joined:
    Jan 8, 2011
    Messages:
    2,294
    Likes Received:
    380

Share This Page