Rinnai Condensing Verses Navien Condensing

    These are the two heavy hitters in the high efficiency Tankless water heater field.  How can you choose the correct tankless, well this article aims to help you choose between the Rinnai Tankless or the Navien Tankless.

    Model NuberRC98HPNR240RC80HPNR180
    Weight71 lbs77 lbs64 lbs67 lbs
    Activation Rate (GPM)
    Min. Input (BTUs,NG)9,50017,0009,50015,000
    Max. Input (BTUs,NG)199,000199,000157,000150,000
    GPM @ 77 Rise5.
    Thermal Efficiency96%98%97%98.8%
    Energy Factor0.940.970.950.96
    Type of VentingConcentric PPTwo Pipe PVCConcentric PPTwo Pipe PVC

    This chart pits the two main tankless systems that each manufacturer produces, the only row it is missing is reliability.  Unfortunately we dont have any scientific data on that but would venture to say that the Rinnai makes the more dependable tankless.  This is solely based on comments that we receive here on the site regarding the two tankless manufacturers.

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    1. Really? your argument is based on 0.1 of a Gallon difference. When the Navien brakes down and cant produce hot water I bet the Rinnai catches up pretty quick.

    2. The two larger units are in correct
      You rounded up the Rinnai and rounded down the Navien, so I guess your Pro Rinnai?

      77 degree rise is the industry standard, so it’s input x efficiency divided by weight of 1 gal, divided by 60 (min in an hour) divided by temp rise

      199,000 x .96 / 8.33 / 60 / 77 = 4.96 GPM @ 77 degree rise on Rinnai

      199,000 x .98 / 8.33 / 60 / 77 = 5.06 GPM @ 77 degree rise on the Navien

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