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  1. 12-05-2005, 05:05 PM #1
    rdtompki
    rdtompki is offline Regular Guest
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    Nov 2005
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    Hollister, CA
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    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
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  2. 12-05-2005, 05:12 PM #2
    wally01
    wally01 is offline Professional Member*
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    Gas furnaces are rated by input ergo 100K = 80K output.
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