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Thread: Commercial water heater output

  1. #1
    DIY Junior Member ferd's Avatar
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    Talking Commercial water heater output

    If I have a 400,000 btu boiler heating water into a 370 gallon tank and I change the tank out to a 120 gallon tank, how much capacity do I loose? Assuming 95% eff boiler.

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
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    What's your usage rate and temperature? Incoming water temp?
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3
    DIY Junior Member ferd's Avatar
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    output 130 deg incoming can be down to 40 boiler should put out 500 gph Just wondering what differance the tank will make.

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    Plumber jimbo's Avatar
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    Quote Originally Posted by ferd View Post
    If I have a 400,000 btu boiler heating water into a 370 gallon tank and I change the tank out to a 120 gallon tank, how much capacity do I loose? Assuming 95% eff boiler.
    Round numbers, the boiler heats produces 400 gallons per hour. FIRST hour delivery is the recovery rate ( 400 gallons per hour ) PLUS 70% ot tank. SO your first hour availablilty drops from 660 gallons to 485 gallons. After the first hour, it is all recovery, 400 gallons per hour.

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