Tankless going cold in the shower

Discussion in 'Tankless Water Heater Forum' started by erblo, Mar 20, 2021.

  1. erblo

    erblo New Member

    Joined:
    Mar 20, 2021
    Location:
    Jurupa Valley, CA
    Hello, I'm wondering if you all can help me.

    I'm in a new house 2 years old with a tankless Rinnai v75 tankless water heater. We just had a Kinetico 2030s water softener installed and now we are having trouble with the water heater. When running the shower, I have hot water for about 3-4 minutes before it goes ice cold. If I press the button to recirculate, I get about 3-4 minutes of hot water again, then it goes ice cold.

    Any ideas here? I'm not sure if this is related to the softener or if it's a coincidence. What should I investigate for this? Thank you for your help.
     
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Joined:
    Sep 2, 2004
    Occupation:
    Retired Systems engineer for defense industry.
    Location:
    New England
    Depending on how cool you like your shower, if you have a low flow head, you may be on the edge of the minimum flow rate, and the tankless no longer thinks you’re using hot water. The recirculating pump increases the flow, but may cycle, and when it shuts off, you return to the same situation. Just a thought...
     
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