“Properly grounded” - GFCI “no equipment ground”?

Discussion in 'Tankless Water Heater Forum' started by CTTX, Mar 22, 2019.

  1. CTTX

    CTTX New Member

    Joined:
    Mar 22, 2019
    Location:
    Texas
    Hi, I’d like to switch to a tankless water heater to recover a closet in my (small, limited-storage, old) house, and I’ll need to have an electrical outlet added. Unfortunately the existing house wiring has no grounds, so GFCI receptacles provide 3-prong outlets where necessary. Would that count as “properly grounded” for installing a tankless water heater, or do we need to have a whole new circuit added with a real ground?
     
  2. bcarlson78248

    bcarlson78248 Member

    Joined:
    Feb 24, 2013
    Location:
    Alexandria, VA
    Have you already picked out a tankless hot water heater, and it is gas or electric?

    Is the receptacle you need just to provide electricity for the controls for the tankless HWH?

    Bruce
     
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  4. hj

    hj Moderator & Master Plumber Staff Member

    Joined:
    Aug 31, 2004
    Occupation:
    Plumber
    Location:
    Cave Creek, Arizona
    There is NO "tankless water heater" that "plugs in" that will give you anywhere the quantity of hot water you would need for even a single faucet.
     
  5. Stuff

    Stuff Active Member

    Joined:
    Mar 7, 2013
    Location:
    Pennsylvania
    hj - Assume it is a natural gas tankless that needs 120v. I doubt a true ground is needed but you never know.
     
  6. CTTX

    CTTX New Member

    Joined:
    Mar 22, 2019
    Location:
    Texas
    Sorry, to clarify, it would be a gas tankless (probably a Rinnai RU160iN or RU180iN), so the electricity is just for relatively low-power things (electronics, flame starter, blower...).

    I looked through a few Rinnai, Noritz, and Vesta installation manuals and they say things like “A standard 3-prong 120VAC 60Hz properly grounded wall outlet” or “electrically grounded in accordance with local codes”.
     
    Last edited: Mar 26, 2019

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