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Help--water content

Thank you all for your responses. I think we have it closely figured out. I appreciate it.


  • Yooper Rick
    Yooper Rick Member Posts: 22
    water content

    I'm trying to figure the amount of water contained in one sq. ft of radiation. Have a home that wants to anti-freeze their system and it has cast iron column radiators. Using Dan's EDR book, I can figure the sq. ft. of radiation but not the water content. Am I missing something? Let me know as I have a contractor that needs to anti-freeze this system today. TIA

  • Jamie Hall
    Jamie Hall Member Posts: 22,912

    there is no usable relationship between EDR (which is a measure of effective surface area) and contained volume. Sorry about that...
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • Mark Custis
    Mark Custis Member Posts: 539
    You could

    drain the system and measure.
  • Nikolai
    Nikolai Member Posts: 31
    System volume

    You have to know your system pipe , boiler and radiators water content in gallons. When you know total system volume in gallons you have to use 70% water and 30% propylene glycol in the system. I have a table for pipe water volume, please e-mail me I will send this table to you.
  • Brad White_203
    Brad White_203 Member Posts: 506
    Howver there is some published data

    from Burnham, from their "Hydonics Heating Helper" handbook.

    Slenderized Radiators 0.066 gallons per EDR

    Large Tube Radiators 0.106 gallons per EDR

    Column Radiators: 0.188 gallons per EDR

    Non Ferrous Convectors: 0.004 gallons per EDR

    CI Convectors: 0.040 gallons per EDR

    Radiant (SunRad): 0.066 gallons per EDR

    Base Ray CI BB: 0.066 gallons per EDR
  • and you will need

    And you will need a much larger expanison tank!
This discussion has been closed.