Downsize Furnace?
Mark wrote:
?
Ratings are based on input. Assuming a 100,000 Btu unit of 80% efficiency,
20,000 is going up the flue, not into your house. With a 100,000 Btu unit
of 90%, only 10,000 is going away, so you have an extra 10,000 going to heat
your house. Thus, a reduction in capacity will give the same amount of
heat.
Is that true?????
I thought furnace ratings were based on OUTPUT...i.e
a 100,000 BTU/Hr 90% furnace DELIVERS 100,000 BTU per hour.
and a 100,000 BTU/Hr 70% furncae also delivers 100,000 BTU/Hr but takes
more fuel to do it.
Correct?
My York (warm air oil fired) furnace nameplate says Bonnet BTU =
100,000 which I thought refers to the output not the input.
Correct?
Mark
Oil furnaces are rated differently than gas.
Gas-fired ratings are input BTU, although output may also be listed.
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