Hot Water Helper for long runs.

Discussion in 'Tankless Water Heater Forum' started by fcompagnari, Apr 17, 2011.

  1. fcompagnari

    fcompagnari New Member

    Nov 16, 2009
    Armanda, MI
    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. Dana

    Dana In the trades

    Jan 14, 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:

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  4. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Sep 2, 2004
    Retired Systems engineer for defense industry.
    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.
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