Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

Inconsistent Shower Temperature

OldHomeProbs211
OldHomeProbs211 Member Posts: 4
in Oil Heating

We just moved into our 120 year old house. When we go to shower we have about 2 minutes of hot water then the water goes cold. After about 10 mins the hot water will come back. This is after no other showers have been taken and no one has been using water for anything. We have oil and I will attatched a picture of our boiler I think it is. Could it just be the pressure? Or do we need to install a tankless system? Thanks for your help!

D9597A64-21D9-489E-AF5C-E61948BBD4B6.jpeg
71198610-7D29-4C03-BD72-931601CC73D6.jpeg

Comments

  • Hot_water_fan
    Hot_water_fan Member Posts: 2,079

    You current have a tankless system, that’s the issue :). There’s no need for a new system at this point. Find someone to fix the current one.

  • LRCCBJ
    LRCCBJ Member Posts: 682

    Here is the critical question:

    When it goes cold………..do you leave it running at full hot for 10 minutes and stand away………….or do you shut it off and wait 10 minutes and try it again?

  • OldHomeProbs211
    OldHomeProbs211 Member Posts: 4

    we leave it running and deal with it cold. If you take a long enough shower you’ll get some hot water at the end.

  • OldHomeProbs211
    OldHomeProbs211 Member Posts: 4

    What exactly needs to be fixed on the system? Thanks for your help

  • LRCCBJ
    LRCCBJ Member Posts: 682
    edited December 2024

    Good info.

    My suspicion is that the settings on the boiler are incorrect. If the boiler can recover and provide HW in 10 minutes, all it needs is an adjustment.

    Can you find the aquastat and take a photo of it with the cover removed? I am guessing from your photo that it is the grey box on the right side of the boiler near the top.

  • OldHomeProbs211
    OldHomeProbs211 Member Posts: 4

    Sorry for such a late reply. Here is a picture of that box with the cover removed

    image.jpg

  • LRCCBJ
    LRCCBJ Member Posts: 682

    You have the Honeywell L7224 control.

    Here are the operating instructions for it.

    https://customer.resideo.com/resources/Techlit/TechLitDocuments/69-0000s/69-1957.pdf

    Read it carefully and understand how to go into the setup for it. What I need to know is the HL (high limit) LL (low limit) and the Ldf (Low Limit differential).

  • BDR529
    BDR529 Member Posts: 322

    No tempering valave at the tankless? The anti-scaldvalve in the shower is having a fit

  • yellowdog
    yellowdog Member Posts: 204

    Replace the coil or have it cleaned.

    GGross
  • Mad Dog_2
    Mad Dog_2 Member Posts: 7,622

    You should have a thermostatic mixing valve on that domestic coil for preventing spikes & scalding. I always install a thermometer guage on the outlet so you know what temp is going out. Mad Dog

    Consulting by Mad Dog & Matt Jr.
    GGross

Categories