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what's the BTU rating for indirect tank

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lost11
lost11 Member Posts: 37
I'm a little confused as to why indirect tanks have BTU input ratings. https://www.supplyhouse.com/Indirect-Water-Heaters-1731000

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  • mikeg2015
    mikeg2015 Member Posts: 1,194
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    That way you know how much boiler capacity is will consume in those conditions and to achieve the rates output. Also gives flow rates at those ratings.

    If your flow is too low you can end ok with too cold of return water for a cast iron boiler. If flow is too high you hurt efficiency with high return water temps.

    You can also use those numbers so you know what the continuous rating is. So if you have a 70f temp rise then at 140,000 boiler input you get 4gpm continuous.
  • Zman
    Zman Member Posts: 7,607
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    lost11 said:

    I'm a little confused as to why indirect tanks have BTU input ratings. https://www.supplyhouse.com/Indirect-Water-Heaters-1731000

    It is a general guideline based on a specific boiler size.
    The continuous output will be BTU/Hr=delta t x GPM X 500, assuming the indirect coil is large enough (rated for your boiler size or larger)
    "If you can't explain it simply, you don't understand it well enough"
    Albert Einstein
  • JohnNY
    JohnNY Member Posts: 3,244
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    All indirect water heater numbers are to be taken with a grain of salt in my experience. Ever try to cross reference one to another? The numbers are intentionally misleading and require great interpretation.
    Contact John "JohnNY" Cataneo, NYC Master Plumber, Lic 1784
    Consulting & Troubleshooting
    Heating in NYC or NJ.
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