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Parallel vs Series

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  • #16
    Re: Parallel vs Series

    You get more hot water with a series installation. The rule of thumb is that you get 75% of the heater's capacity as hot water, before the incoming cold has cooled off the water. Two parallel 50's give you 75 gallons of hot water at one shot. Two series 50's gives you 87 gallons at one shot. Most parallel installations end up favoring one over the other, and you have a heater sitting there.

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    • #17
      Re: Parallel vs Series

      I am a huge supporter of Rinnai, they are the best tankless on the market.

      Tankless is not for everyone, depends on the customers needs.

      They also have to be installed correctly, few are.
      sigpic

      Robert

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      • #18
        Re: Parallel vs Series

        Originally posted by westcoastplumber View Post
        I am a huge supporter of Rinnai, they are the best tankless on the market.

        Tankless is not for everyone, depends on the customers needs.

        They also have to be installed correctly, few are.
        i agree.

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        • #19
          Re: Parallel vs Series

          In series, if the second goes down then you better have bypasses installed.
          Don't you guys see two tank installs mostly in commercial? I do. The amount of space it takes for 2 50's in a residence is usually better served by a 75 gallon tank.
          ANYONE CAN TAKE THE HELM WHEN THE SEA IS CALM.

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