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Old 12-27-2007, 04:30 AM   #1
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Anyone know how much Propane it uses???

Thanks Don and Barb
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Old 12-27-2007, 04:30 AM   #2
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Anyone know how much Propane it uses???

Thanks Don and Barb
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Old 12-27-2007, 05:14 AM   #3
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Tcloud7:
Anyone know how much Propane it uses???

Thanks Don and Barb </div></BLOCKQUOTE>

Depends on alot of factors

A. How big is your tank?
B. How long will you run your furnace?
C. Hot cold is it outside?
D. What is your thermostat set on?

We can go through a 28 gallon tank in about 3-4 days with an outside temp of 25, inside at 65.
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Old 12-27-2007, 05:36 AM   #4
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If you want to do the math. Here is a web site that gives the figures on LP. As you can see as the temperatures go down & the volume of LP goes down you get less btu/hr. Your furnace is either a 35000 or 40000 unit.
http://www.flameengineering.com/Propane_Info.html
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Old 12-27-2007, 06:34 AM   #5
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Thanks Guys. We have been running it alot. I have had it set to 75 sometimes then 65 at other times. We have an 80 Gal.Tank. The temps have been in the fortys in the day and in the teens at night.
I filled the tank on 12-24and I will fill it today and that will tell me. It was 19 this morning.

Thanks Don and Barb
In Deming NH heading to Benson AZ
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Old 12-27-2007, 07:53 AM   #6
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Tcloud7:
Thanks Guys. We have been running it alot. I have had it set to 75 sometimes then 65 at other times. We have an 80 Gal.Tank. The temps have been in the fortys in the day and in the teens at night.
I filled the tank on 12-24and I will fill it today and that will tell me. It was 19 this morning.

Thanks Don and Barb
In Deming NH heading to Benson AZ </div></BLOCKQUOTE>

Don,

They usually put 80 lb to 120 lb in those rigs which is less than 28 gallons. An 80 gallon tank would hold close to a quarter ton of propane. My home has a 250 lb tank an it is about six feet long and 2 1/2 feet in diameter.
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Old 12-27-2007, 08:41 AM   #7
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">see as the temperatures go down & the volume of LP goes down you get less btu/hr. Your furnace is either a 35000 or 40000 unit. </div></BLOCKQUOTE>
Take a look at the explanation below the chart. The purpose of the regulator is to compensate for this. Small cylinders and low temperatures can reduce what is available to regulate, though.

The BTU content of propane is ~93k BTU (91,690 on the linked page, after vaporizing). A furnace rated at 35k or 40k BTU/ hour as noted in the quote would then run about 3 hours for each gallon of liquid propane you have.

Liquid propane is about 4 lb per gallon (a 20lb tank holds 5 gallons, 30 lb tank 7+ -- page says 4.23/gal and 21,591 BTU/lb) That means the furnace will burn a bit more than a pound an hour.

Duty cycle is the big factor. Generally, plan on 50% to maintain 65F temps in 32F wind chill outside. Perhaps 100% at 0F wind chill outside. That means each gallon of propane could last 6 hours in cold temps down to 3 hours worst case.

100 gallon tanks are fairly common for seasonal RV park rentals. That might last 500 hours or 3 weeks in cold temperatures. The typical TT has maybe a tenth of that capacity which means 2 days and that is about right (a bit conservative).

These are very rough estimates so please don't take them out of context or as intended for anything more than providing some clue about how long you might be able to keep warm with a propane furnace in a typical RV.

BTW - one reason household tanks are mounted sideways may have to due to that making for more surface area of the liquid in the tank and that means faster vaporization for more BTU flow. Vaporizing propane at a rapid rate can really cool the tank and even freeze up regulators, too.
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Old 12-27-2007, 10:37 AM   #8
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Tcloud7:
We have an 80 Gal.Tank. </div></BLOCKQUOTE>

Might want to look at that again.....
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Old 12-27-2007, 03:57 PM   #9
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Might want to look at that again..... </div></BLOCKQUOTE>
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Might want to look at that again.... </div></BLOCKQUOTE>
Yes it is an 80 gallon Tank. at 80% it holds 60 gallons.
We bought this Motorhome used and it has a Propane Generator and the first owner did alot of boondocking because his Son was on the Dirt Bike circuit and he was running out Propane all the time. Propane People have told me its a $1000.00 Tank

I wanted to fill it today but the Flying J we stopped at had the Propane Tank shut down because the motor on the pump went out.

Thanks For All to input and help.

Don and Barb
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