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  • Incoming Tankless Water Temperature

    My water temperature this morning is 54 degrees. What's yours?

    Thanks.


    J.C.

  • #2
    Re: Incoming Tankless Water Temperature

    Originally posted by JCsPlumbing View Post
    My water temperature this morning is 54 degrees. What's yours?

    Thanks.


    J.C.
    50ยบ F here
    Ron Hasil Lic #058-160417
    A-Archer Sewer & Plumbing specializing in:
    Tankless Water Heaters | Drain and Sewer Cleaning
    Sump and Ejector Pumps | Backflow RPZ Testing

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    • #3
      Re: Incoming Tankless Water Temperature

      37f.

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      • #4
        Re: Incoming Tankless Water Temperature

        56. usually goes to 40 at the end of winter.

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        • #5
          Re: Incoming Tankless Water Temperature

          58 degs here

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          • #6
            Re: Incoming Tankless Water Temperature

            I've been checking often.

            45
            48
            39
            41

            etc.


            Tankless don't perform too well with these incoming temps. The curve drops a good amount. Got to keep it in mind to keep from getting callbacks & questions.


            J.C.

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            • #7
              Re: Incoming Tankless Water Temperature

              Toronto's water is 47 oF (Dec21). I was actually surprised is was that high...but winter is just beginning!

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              • #8
                Re: Incoming Tankless Water Temperature

                Using the average of the 4 temps above for my area (not the warmer one I started the thread with, I try to plan for a no callback scenario), the largest condensing Rinnai-Model RC98HPi will produce roughly 5 gpm at around 118F. Remember too, that's the highest capacity unit they make. They should be forced to remove the 9.8 GPM rating off of any advertising.

                Only good for a spec house size two bathroom 4 person house. And that's if they probably alter the way they use the hot water on coldest days.

                Many will undersize the application because they do not take into account the winter incoming temperature for their area.


                J.C.

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                • #9
                  Re: Incoming Tankless Water Temperature

                  But they can produce proclaimed temps.The water supply is drawn off a service ran 200' just 2" under a asphalt driveway in an Arizona desert.

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                  • #10
                    Re: Incoming Tankless Water Temperature

                    Originally posted by drtyhands View Post
                    But they can produce proclaimed temps.The water supply is drawn off a service ran 200' just 2" under a asphalt driveway in an Arizona desert.
                    I had a steakhouse call me one day and say they had no cold water. I went and checked the temp at the hose bibb and it was 85 degrees. The water main is 18" deep under the parking lot and it was 102 outside for about a week. Easy service call.

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