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Early 1950's boiler vs 2025

corgi11
corgi11 Member Posts: 92
in Radiant Heating

If a boiler was rated at 75k BTU IBR net in the early 1950's and a new boiler from today rated at 75k BTU IBR net are they the same output or are the old ones underrated?

Comments

  • Grallert
    Grallert Member Posts: 997

    A BTU is a BTU. So they're the same. What is different is how those BTUs are made, collected, stored and delivered.

    Miss Hall's School service mechanic, greenhouse manager, teacher, dog walker and designated driver

  • corgi11
    corgi11 Member Posts: 92

    Thank You

  • mattmia2
    mattmia2 Member Posts: 14,510

    The measurement method probably has changed some over the years but it isn't like engine horsepower where some methods had no basis in conditions the engine could ever operate in in the real world.

  • hot_rod
    hot_rod Member Posts: 25,850

    There is an IBR net and IBR gross output number on newer equipment. This article explains how to use the ratings based on where the boiler is installed.

    https://www.hpacmag.com/features/making-sense-boiler-ratings/

    Screenshot 2025-03-05 at 11.28.11 AM.png
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
    mattmia2
  • corgi11
    corgi11 Member Posts: 92
    edited March 5

    Thank You

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