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Glycol for hydronic systems. How to calculate amount of glycol t

Drew_2 Member Posts: 158
Dan gave you the link to our website. Look under technical then fluids. If that doesn't give you what you need, give me a call. I'm on EST the number is 800-678-6625, Ext. 108



  • George Gannon
    George Gannon Member Posts: 1
    Glycol: How to calculate amount necessary

    How do I calculate the amount of glycol for a hydronic heating system? Is there any texts that have this info? I have looked a Modern Hydronic Heating and Modern Heating, Ventilation and Air Conditioning but can't find info I need. Any help would be appreciated.
  • Rudnae
    Rudnae Member Posts: 47
    It depends on volume

    It depends on system volume. Calculate the volume of all the pipe, indirect coils, fan coils, and boiler. Then you take a percentage of that to give how much glycol to put in. Most people use a 30% mix, but if you are doing a snow melt you may wish to go to 50%. Your supplier of glycol should have a chart that will give you the right percentage for freeze/burst protection that you will require. Hope that helps.
  • DanHolohan
    DanHolohan Member, Moderator, Administrator Posts: 16,490
    Noble Company

    has some good information on this. They sponsor the Library on this site. Here's a direct LINK to a page that will be helpful. Scroll down a bit when you get there.
    Retired and loving it.
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