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Has anyone ever heard of Monitor Bi-Loop Radiator Company

Trying to find out if above mentioned Company is still in business or has been sold and is under a different name.
Family has stocks from 1920's and need to know if worth it to continue search!


  • Steamhead
    Steamhead Member Posts: 16,840
    They were around in the 1920s

    but the Depression may have killed them off. I have a couple of ads from that period, but nothing after 1930. The original Bi-Loop system used radiators that were filled with water, but heated by steam at very low pressures ("Vapor").

    It's possible that they were acquired by one of the big radiator makers of the time- American Radiator Co. (which later became half of American-Standard), National Radiator Co. (which sold out to Crane, Slant/Fin later bought this part of the business and still owns it) or U.S. Radiator Co. (which merged with National to form National-US before Crane bought them). These companies were all formed by mergers and aquisitions.

    I do know that a Bi-Loop Vapor system (using standard radiators) is still running in a house in Hagerstown, MD. They really built things to last in those days!

    Could you see your way clear to scanning a few of these items and posting them here? We'd love to see them!

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    All Steamed Up, Inc.
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