Commercial water heater output

Discussion in 'Water Heater Forum, Tanks' started by ferd, Sep 15, 2011.

  1. ferd

    ferd New Member

    Messages:
    15
    Location:
    Ohio
    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. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,128
    Location:
    New England
    What's your usage rate and temperature? Incoming water temp?
  3. ferd

    ferd New Member

    Messages:
    15
    Location:
    Ohio
    output 130 deg incoming can be down to 40 boiler should put out 500 gph Just wondering what differance the tank will make.
  4. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    San Diego
    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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