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Thread: Hot Water Helper for long runs.

  1. #1
    DIY Junior Member fcompagnari's Avatar
    Join Date
    Nov 2009
    Armanda, MI

    Default Hot Water Helper for long runs.

    I am looking for any type of Hot water assist system that would hook up to the hot side of the faucet under the cabinet and only dispenses heated water until the hot water arrives from the Hot water tank. Once the hot water arriving is hotter than the set temp pf the assist, it will only then pass the how water tank heated water.

  2. #2
    In the trades Dana's Avatar
    Join Date
    Jan 2009


    Small 3-5 gallon electric tanks are availble that fit in many sink-cabinets. If fed by the water from the main HW heating system, it's mainly only running in standby mode (about a 35-50W continuous load.) The volume of water in the pipe from the main hot water heater determines how much volume you need to counteract the dilution. (It takes 90' of 1/2" or 45' of 3/4" copper pipe to add up to a gallon. Min size on the tank would be ~ 3x the water volume of the distribution plumbing.)

    The more expensive solution to install would be an electric tankless in series, but that would involve running a dedicated high current circuit- maybe even a new breaker panel. A tankless throttles back on power as the incoming water temp rises, but you'd still be looking at 10,000W or more to support any reasonble flow before the slug of hot water arrived from the tank.

    In any configuration insulating the near-tank(s) plumbing and the distribution run from the main tank to the remote faucet location with 5/8" or 3/4" walled closed cell foam pipe insulation reduces standby, and extends the time between draws to where it's still hot enough to be useful up to about a half-hour. See: http://www.leaningpinesoftware.com/h...er_pipes.shtml

  3. #3
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    New England


    Or, you could put in a hot water recirculation system...probably about the same standby losses as a tank and it would likely provide hot at all locations in the home verses one.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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