On Sat, 21 Dec 2013 13:46:01 -0500, wrote:

On Sat, 21 Dec 2013 11:28:48 -0500, micky
wrote:

On Thu, 19 Dec 2013 23:37:46 -0500, wrote:

On Thu, 19 Dec 2013 22:32:10 -0500, micky
wrote:

On Thu, 19 Dec 2013 22:22:00 -0500, Ed Pawlowski wrote:

On 12/19/2013 2:17 AM, gregz wrote:
Today's furnace specify btu. Is that input or output ?

Greg


Input. Figure the output by multiplying by the efficienct rating.

Is that true for oil furnace, too?

Yes.

Or maybe the question is, Was that true for oil furnaces 35 years ago,
too?

Yes. It was stated as such, on mine. As others have stated, it can't
be anything else. There are too many variables to state the heat
output.

Well, my furnace is a Carrier model 58HV085

And in the owners manual, it says
Ratings, Input (1000 Btuh) 106
Output (1000Btuh) 85

So it not only rates the output, it named the model of furnace after
the output.

I went shopping for a new oil furnace, but the brochures they gave me
didn't show if they rate them by input or output or both now, of if
the model number reflects either number.

(HV means it's an upflow furnace, and 58 is the series, a group of
furnaces including downflow, upflow, loboy, etc of variious sizes, a
total of 18 models, all of which are named after their rated output)

Plus the blueprints for the house, which I got fromt he architect,
have 85,000 (or maybe 85,000 btu) hand-written in big numbers at an
agle on them.


It was installed 34 years and a few months ago, and when shopping for
a new furnace, I have to be careful NOT to buy one with 85,000 input,
which won't give as much output as I have now.


Here's the spec sheet for all of them. The info starts at page 3.
http://www.xpedio.carrier.com/idc/gr...it/58h-5si.pdf
How long does your furnace run on the coldest day of the year? If it
runs less than 8 hours, chances are very good the furnace is larger
than required. If it runs over 16 there is a strong chance it is
slightly undersized.

Yeah, I've heard about that, and I wish I'd kept track as much as I
could have.

We don't have many days that are the coldest, and I kept NO track
during those.

I could extrapolate maybe, if I kept better track on even non-coldest
days, like most of last week. I did notice, without looking at a
clock, that it often ran maybe 10 minutes, and then was off for only
10 minutes, but I guess those are estimates. Often I'm in the
basement on the computer for hours during the middle of the night. It
might be like that then too.

But it's in the 60's today and until Monday,. I'll have to start
paying attention after that. High in the 40's on Tuesday, t hey
predict now.

Thanks for the question.