What water heater for gravity loop?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by mark_g, Mar 31, 2009.

  1. mark_g

    mark_g New Member

    Mar 3, 2009
    Locally, Rinnai and Noritz are available, and my plumber uses both. This is for new construction.

    In the house, we're thinking of installing a gravity loop system with a HW return, and for demand reasons, putting in a small storage tank (there will be occasional times when we need to run two showers and kitchen sink simultaneously). He isn't sure gravity loop will work with either unit. I don't want a pump.

    In a separate sm efficiency apartment, we're considering a CW return off a separate tankless unit, as that could prevent pipe freezeups in the winter?

    Anyone had experience with RedyTemp, ReadyHot, Red Lobster for either or both of these applications?

    Feedback appreciated. Installation is in upper NY State.
    Thank you, Mark
  2. hj

    hj Moderator & Master Plumber Staff Member

    Aug 31, 2004
    Cave Creek, Arizona

    Gravity recirulation systems DO NOT work with tankless heaters. It will work with the 6 gallon heater, IF it is installed correctly.
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  4. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Sep 2, 2004
    Retired Systems engineer for defense industry.
    New England
    I've had a RedyTemp installed for about 5-years and it works fine. I have it on a 7-day timer so it only runs when I'm normally both home and awake.
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