# Goodman GMP075-3 Furnace - Quick Question

• posted on February 6, 2007, 12:57 am
Goodman GMP075-3 Furnace.. LP ..
What consumption rate should this thing have in terms of GPH or similar?
What should the hot air output temp be?
Thanks

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• posted on February 6, 2007, 1:14 am
What are you trying to do? LOL
It uses 75 Cubic Feet of gas per hour...75,000 btu's Where do you live? Is this thing converted to propane?
Measure your supply temp apprx 6' away from the furnace in the supply plenum. 130F or lower is normal. The temp rise should be roughly 40-70f difference between supply and return air temp. 70f coming in 130f leaving = 60f temp rise.
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• posted on February 6, 2007, 1:57 am
One gallon of propane=approx 91,000 btu. Your furnace, if the orifices and gas pressure are correct, will burn 75,000btu/hr. Therefore, it should burn approx .82 gal/hr, or run about 1.2 hr (72minutes) on a gallon. Larry

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• posted on February 6, 2007, 3:17 am

A gallon of LP is 91,500 btu
75, 000 will burn .8196 of a gallon/hr.
This is assuming that the unit is operating under the correct specifications.
The temperature rise should be around 50-55 degrees with a clean filter.

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• posted on February 17, 2007, 7:04 am
hanks to all for the info on burn rate. I learned :
1- Potential Energy for LP is 91k btu/gal. 2- Divide Btu/Hr rating of unit by PE and you get gals/hr 3- Output temp of a furnace isn't a fixed temp, its the delta between input air temp and output air temp, and that delta should be in the 40 -70 degree range. Output air temp should be measured appx 6' downwind from the unit. 4- Paul hasn't gotten any. Now, Yet, Likely Ever. Middle-age case of acne driving really BIG pickup. F-350 or Ram3500 I'd bet. A new roll of duct- tape in the glove box awaiting that "special someone".
MPDsville
On Feb 5, 7:57 pm, snipped-for-privacy@yahoo.com wrote:

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• posted on March 5, 2007, 3:59 am

Not when dealing with Natural gas.

Not on ALL units, some are in the 20-50 degree range. It's best to check the manufactures specifications!

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• posted on March 5, 2007, 5:37 am
The ratings are required to be on the appliance per AGA.. look near the burner area for the rating plate. The plate will list the allowable air temperature rise, the bonnet capacity, etc.
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Zyp

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• posted on February 17, 2007, 7:21 am
Thanks to all for the info on burn rate and output temp.
I learned :
0- Oil furnaces have nozzles rated by Gph. With an LP furnace, you do the math. (same for Nat Gas measured CuFt?) 1- Potential Energy for LP is 91k btu/gal. 2- Divide Btu/Hr rating of unit by PE and you get gals/hr 3- Output temp of a furnace isn't a fixed temp, its the delta between input air temp and output air temp, and that delta should be in the 40 -70 degree range. Output air temp should be measured appx 6' downwind from the unit. 4- Paul hasn't gotten any. Now, Yet, Likely Ever. Middle age case of acne driving really BIG pickup. F-350 or Ram3500 I'd bet. A new roll of duct-tape in the glove box awaiting that "special someone" no doubt... (Don't worry Paul, that special someone is out there for you. Just look past the short leg and the harelip. )
Thanks to all for the information, MPDsville
On Feb 5, 7:57 pm, snipped-for-privacy@yahoo.com wrote:

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• posted on February 17, 2007, 7:33 am
Thanks to all for the info on burn rate and output temp.
I learned :
0- Oil furnaces have nozzles rated by Gph. With an LP furnace, you do the math. (same for Nat Gas measured CuFt?) 1- Potential Energy for LP is 91k btu/gal. 2- Divide Btu/Hr rating of unit by PE and you get gals/hr 3- Output temp of a furnace isn't a fixed temp, its the delta between input air temp and output air temp, and that delta should be in the 40 -70 degree range. Output air temp should be measured appx 6' downwind from the unit. 4- Paul hasn't gotten any. Now, Yet, Likely Ever.... (Don't worry Paul, that special someone is out there for you. Just look past the short leg and the harelip. )
Thanks to all for the information, MPDsville
On Feb 5, 7:57 pm, snipped-for-privacy@yahoo.com wrote: