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  1. #1
    Join Date
    Nov 2005
    Location
    Hollister, CA
    Posts
    30
    Are furnaces ratings at the "input" or "output"? If I have an 80% efficient 100K BTU furnace do I burn propane at an equivalent rate of 100K BTU or at 100K/0.80 = 125K BTU?

    Rick T

  2. #2
    Join Date
    Feb 2004
    Location
    michigan
    Posts
    677
    Gas furnaces are rated by input ergo 100K = 80K output.

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