tankless water heater with tank supplement

Discussion in 'Tankless Water Heater Forum' started by camner, Jan 10, 2009.

  1. camner

    camner New Member

    Jan 10, 2009
    One of the issues with a tankless system is the so called "cold water sandwich." One site has an idea for how to reduce this issue (see http://www.taunton.com/finehomebuilding/PDF/Free/021192082.pdf).

    I'm intrigued by the idea at the end, which is to install a pump between the tankless and the tank so that the tank is filled by the tankless heater when the thermostat on the tank indicates that it needs to have hotter water. See "The Fix: problem #2" in the PDF)

    I don't understand the plumbing diagram for this, though. It appears to use 3 inlets into the tank, when I think there are typically only two.

    Has anyone tried anything like this out? Or even if not, to explain how the pipe diagram would work?
  2. nhmaster

    nhmaster Master Plumber

    Jul 30, 2008
    Tech. Instructor
    S. Maine
    Oh boy, a chance to spend even more money.
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  4. 99k

    99k Radon Contractor and Water Treatment

    Aug 16, 2008
    Contractor of Radon Reduction, Testing, and Water
    Fairfield Co.,Connecticut
    It appears they removed the TNP valve and relocated elsewhere. This looks like a tremendous investment ... I can't imagine the payback time for this set-up.
  5. chris8796

    chris8796 New Member

    Jan 8, 2005
    I would agree with 99k, they removed the TNP valve. They also disconnect the heating element from the tank, so its a storage tank w/o a heater. All of the heating is done by the tankless.
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