Water heater - one notch cold to hot

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by sanrico, Apr 14, 2020.

  1. themp

    themp Member

    Joined:
    Feb 5, 2008
    Location:
    Raleigh, North Carolina
    Found this on a Canadian CDC website:

    * 70 to 80 °C (158 to 176 °F): Disinfection range
    * At 66 °C (151 °F): Legionellae die within 2 minutes
    * At 60 °C (140 °F): Legionellae die within 32 minutes
    * At 55 °C (131 °F): Legionellae die within 5 to 6 hours
    * Above 50 °C (122 °F): They can survive but do not multiply
    * 35 to 46 °C (95 to 115 °F): Ideal growth range
    * 20 to 50 °C (68 to 122 °F): Legionellae growth range
    * Below 20 °C (68 °F): Legionellae can survive but are dormant

    So, at 140 degrees F to the shower heads and faucets, it takes 32 minutes to kill it. Not going to happen in my household...
     
  2. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    Where is the legionellae going to come from? You can sanitize your system after doing work. It does not come back from spontaneous generation.
     
  3. DIYorBust

    DIYorBust Active Member

    Joined:
    Mar 5, 2019
    Location:
    Long Island, New York
    I don't think it's as big an issue at the taps or showerheads, since they are not warm very long. But the water heater could house bacteria for a long time at the set point, and doesn't completely flush out with each use.
     
  4. Sylvan

    Sylvan Still learning

    Joined:
    Sep 23, 2004
    Occupation:
    plumbing - fire suppression - boiler inspector
    Location:
    New York
    When going on vacation depending how long if it is wiser to just shut it and relight it when you return

    Unlike a boiler a water heater has one safety device the T&P a Boiler has high limit and LWCO plus either a safety or a relief valve plus operating controls
     
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