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Old 11-29-2013, 05:41 PM   #1
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a frame 122 and propane life

How long does the propane tank last when running furnace on 15-20 F temperature?

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Old 11-29-2013, 06:50 PM   #2
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too many factors to give a specific time amount.

if you have electric hookups, get a ceramic heater and only use the furnace to supplement the heater.

if you don't have electric hookups, your battery will be dead in one or two nights, waaayyy before you run out of propane.

we can use one tank of propane for an entire season, even with some furnace use.

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Old 11-29-2013, 09:19 PM   #3
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If my Googling is correct.....a gallon of propane has 91,502 BTUs of energy. The furnace provides 20,000 BTUs per hour of heat. So two full tanks should give you many hours of burn time. The burn time you will need to be comfortable is dependent on the outside temperature and and the inside thermostat setting. Obviously the lower setting on the thermostat the longer the furnace will need to burn for you will stay warm. I have never camped below about 25 degrees, in my old tent trailer we made it over the weekend with plenty propane to spare. In a better insulated and smaller volume A Frame, you should get along for some time.

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Old 11-30-2013, 07:47 AM   #4
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It is too late to edit the above post, so I'll put some more information here. Assuming the numbers I've looked up are accurate....

A fully filled 20# tank will have 4.7 gallons of propane. For two tanks that is 9.4 gallons.

91,502 BTUs X 9.4 gives 860,119 total BTUs. 860,119 BTUS / 20000 BTUs/hr gives 43 hours of burn time for two filled tanks.

Allowing some inefficiencies and not fully topped off tanks, say 40 hours. Your furnace will not burn all that time so the actual heating time will be much longer. A minimum of least 80 hours and likely much longer, depending on the circumstances.

As mentioned by bikendan, if you don't have a 120V connection then your battery power is the limiting factor. If you do have 120V, then even a small heater will dramatically reduce propane usage. Most people report the small ceramic heaters with fans to be the best.

With this setup, you turn on the heater and set the furnace thermostat to a bit lower temperature than you normally would. Both will work until the camper is warm, then the furnace will cut off and the ceramic heater will exclusively (and quietly) provide the heat as long as the heat loss doesn't exceed its capacity. At which point the furnace will cut in to give a big boost.

2012 Rockwood A122S
2008 Toyota Tundra Double Cab 4X4

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Old 11-30-2013, 09:55 AM   #5
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We got 10 nights on one tank with temp 25-40* and inside temp set to 58*, not used during the day. I think we did 4 BQ. The rest on the inside stove. Hot water tank was off. Ice box on 24/7.
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frame, propane, a-frame

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