Ernest V.F. Hodgson
  • Raleigh, NC
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Combustion Furnace BTU output
9 Replies

Does anyone have an inexpensive method to "clock" a combustion furnace to estimate BTU output similar to Natural gas, but for propane, kerosene, or oil? I work in the Weatherization Assistance…Continue

Started this discussion. Last reply by Bud Poll Dec 6, 2013.

 

Ernest V.F. Hodgson's Page

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Bud Poll replied to Ernest V.F. Hodgson's discussion Combustion Furnace BTU output
"I'll apologies in advance for drifting here a bit, but your "close enough" comment threw me back to my beginning in this business (05) when I questioned every number we use.  The idea of pinning down the performance of a home to…"
Dec 6, 2013
Ernest V.F. Hodgson replied to Ernest V.F. Hodgson's discussion Combustion Furnace BTU output
"Thanks Bob, we'll go woithout. It should be close enough without having to factor in pressures and temps, etc and  complicate the process too much."
Dec 6, 2013
Bob Blanchette replied to Ernest V.F. Hodgson's discussion Combustion Furnace BTU output
"For propane figure about 20-25k per burner rated input. Varies some form unit to unit but 22k is typical."
Dec 5, 2013
Doug Pearl replied to Ernest V.F. Hodgson's discussion Combustion Furnace BTU output
"For the oil burning furnaces, you should check the pump pressure. Older furnaces run at 100psi, and newer ones run at 140psi. When the pressure is higher, you need to cross reference the nozzle size to get proper Btu ratings. Plenty of reference…"
Dec 5, 2013
Ernest V.F. Hodgson replied to Ernest V.F. Hodgson's discussion Combustion Furnace BTU output
"Thanks, I did find that out. In weatherization we deal with some really old furnaces, so sometimes getting a ballpark furnace size is the best we can do but the nozzle sizes for oil seem to be pretty specific."
Dec 4, 2013
Bud Poll replied to Ernest V.F. Hodgson's discussion Combustion Furnace BTU output
"Ernst, You mentioned oil, but the replies seem to all be for gas, unless I didn't read correctly.  For oil you can look for the nozzle size.  Sometimes it is notes on the service tag or in the manual, if still around.  In some…"
Dec 4, 2013
Ernest V.F. Hodgson replied to Ernest V.F. Hodgson's discussion Combustion Furnace BTU output
"Thanks for all the comments plus the link. I think based on them I have enough information forfollks in the field to get close enough to the correct size furnaces for modeling the houses thanks all."
Dec 4, 2013
Steven Lewis replied to Ernest V.F. Hodgson's discussion Combustion Furnace BTU output
"For propane, you can look at the burner orfice size.  there are charts that give the btu rating for the orfice size. then multiply by the numbers of burners.  will give approx output.  LP orfices are usually slightly smaller btu than…"
Dec 3, 2013
Bill Bradbury replied to Ernest V.F. Hodgson's discussion Combustion Furnace BTU output
"For natural gas, run only the furnace for a given time, mark the dial difference on the meter and multiply the gas used by the heat multiplier for your gas supplier. This will give you a ball park estimate."
Dec 2, 2013
Ernest V.F. Hodgson's discussion was featured

Combustion Furnace BTU output

Does anyone have an inexpensive method to "clock" a combustion furnace to estimate BTU output similar to Natural gas, but for propane, kerosene, or oil? I work in the Weatherization Assistance Program and often the nameplates are missing from existing furnaces. Without BTU output it is tough to do an accurate computer model of the home. Thanks!See More
Oct 31, 2013
Ernest V.F. Hodgson posted a discussion

Combustion Furnace BTU output

Does anyone have an inexpensive method to "clock" a combustion furnace to estimate BTU output similar to Natural gas, but for propane, kerosene, or oil? I work in the Weatherization Assistance Program and often the nameplates are missing from existing furnaces. Without BTU output it is tough to do an accurate computer model of the home. Thanks!See More
Oct 25, 2013
Ernest V.F. Hodgson replied to Jack Baikoff's discussion Just how much does adding air barrier to a knee wall insulation increase it's performance?
"Just adding my 2 cents here regarding knee walls and insulation. First off if there is a lot of air infiltration between conditioned space and the attic knee wall (and the attic behind it) it will affect the R-value of the insulation because of the…"
Oct 11, 2013
Ernest V.F. Hodgson replied to Bud Poll's discussion The science of hot air rising
"Just a quick reply, little new to the site and this is maybe a little simplistic but, at least for clients to grasp, the opener"heat will always go to cold" helps themto get their heads around the idea. To this point as it pertains to flue…"
Dec 2, 2011
Ernest V.F. Hodgson is now a member of Home Energy Pros
Jul 15, 2011

Profile Information

Company
N.C. Department of Commerce
Professional Certification
HERS Rater, BPI Analyst & Envelope Proffesional
Professional Interests
Renewable Energy, Home Energy Audits
Website URL
http://energync.net

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At 12:15pm on July 25, 2011, Diane Chojnowski said…

Hi Ernest,

Welcome to Home Energy Pros! Feel free to join the conversation in the Forum and Groups. And share your energy efficiency photos, videos and upcoming events. If you're blogging about home performance, this is the place for you!

Don't forget to upload your profile photo. And add your location on our Member Map!


Thanks!
Diane, HEP Moderator

 
 
 

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