Utica - Shower water turning lukewarm after 5 minutes

Discussion in 'Tankless Water Heater Forum' started by Carol Lee, Jan 17, 2020.

  1. Carol Lee

    Carol Lee New Member

    Jan 17, 2020

    So my tenants noticed recently that the hot water in their shower will turn ice cold after about 5-7 minutes and not really get hot again. After testing a bit I noticed the shower water would stay nice and hot for as long as we needed if the sink was also turned hot while the shower was on. I chalked it up to a minimum flow requirement issue. So we checked the filter on the cold water intake and it was indeed pretty dirty. So we cleaned it, put it back, and did a quick descaling.

    Now, the water no longer turns cold, but it noticeably drops in temp (lukewarm ish) after the same amount of time in the shower. So the situation has improved but obviously hasn't been completely fixed. All the fixtures with single handles are experiencing this (I know it's not ideal to match those with tankless) but it's a new issue that started after about 8 months with no issues.

    Is there anything else I can clean/replace that will fix this? Or am I missing something else completely.

    Model is Utica ccb-150

    Last edited: Jan 17, 2020
  2. SoCal Plumber

    SoCal Plumber New Member

    Feb 18, 2020

    Isolate the hydronic lines and see if the issue is still occurring. If not, the check valve in the recirculating pump has failed causing a cross over in the plumbing. That’s a place to start, but it sounds like a cross over issue so any failed check valve could be causing the issue.
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  4. fitter30

    fitter30 Member

    Feb 2, 2020
    Retired service tech
    Peace valley missouri
    Check the vent screen for dirt. Combustion air
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