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Steam radiator rating

Does anyone have an information on the output of the radiator in the attached photos?

These are two-pipe steam radiators installed in 1904.  The name on the top cover is GILLIS & GEO CHEGAN NY.  The name on the base is AA CRIFPING IRON CO  NY.

Jeff Eichenwald


  • Tim_75
    Tim_75 Member Posts: 44
    EDR - the book

    There' a fellow here, Dan Holohan, that knows a little about these things and even wrote a book, just for this very reason.E.D.R. - Ratings for Every Darn Radiator (and convector) you'll probably ever see
  • moneypitfeeder
    moneypitfeeder Member Posts: 249

    Are you sure the name on the rad isn't A. A. Griffing Iron Co.?
    steam newbie
  • moneypitfeeder
    moneypitfeeder Member Posts: 249
    looks kinda like

    The bundy made by AA Griffing, check the link below on the right side of the page there's a link for read online. You'll have to measure it and look on the chart to find the radiation.


    Hope it helps
    steam newbie
  • BobC
    BobC Member Posts: 5,473
    edited February 2011
    good enough

    This is how I figure out the EDR of a radiator when i don't have tables available, it's not 100% accurate but good enough.

    Wrap a piece of string around that end tube so you can measure the outside diameter of the tube and then figure out how long all those tubes are. Multiply the total length of the tube by the diameter and that will give you the area of the radiant surface, divide that number by 144 and that will give you the EDR in sq feet.

    Smith G8-3 with EZ Gas @ 90,000 BTU, Single pipe steam
    Vaporstat with a 12oz cut-out and 4oz cut-in
    3PSI gauge
  • crash2009
    crash2009 Member Posts: 1,484
    Here is the link

     to the "Bundy Radiator" up in the library here. Griffing Iron Company   http://www.heatinghelp.com/files/articles/1275/92.pdf
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