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Old 02-06-2014, 07:25 PM   #11
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I just happened upon this thread. We had 2/3 of a tank (on the tank gauge) when we spent one very cold night (19F) and had heat set at 70F. By the next morning we were down to 1/3 of a tank. I know the heat ran a lot, but that sounds way excessive. This is on a 2014 FR3 30DS.
What if anything was the water heater and fridge running on?
If gas this would all add up quick.
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Old 02-06-2014, 08:33 PM   #12
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Thank you sir for asking! :-)

I am a new RV'er and wanted to know how far would my LP would last in temps below 32 degrees.

Running heat in lp and water tank on lp

Everything else on electric

How many weeks would lp last?
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Old 02-06-2014, 08:57 PM   #13
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My father was a full timer for one winter in his Montana 5er. In freezing cold weather he would go through one tank every other day. He kept the thermostat high around 70. If you want it to last longer, turn it down to about 65 at night.
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Old 02-06-2014, 11:31 PM   #14
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That does sound like a lot. I've been running my furnace every night and sometimes during the day for 10 days since I last got it filled and it' still showing 2/3 (true it's on the control panel... I'll have to check the gauge). Still 1/3 of a tank in one night, even a cold one, sounds excessive. According to typical numbers I've seen (from my post above), even if it ran steady for 8 hours that should be less than 3 gallons. Of course, I don't know exactly how good those numbers are. Someone else might have a better idea.

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Old 02-07-2014, 10:44 AM   #15
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For one week I had my set at 64 and it took about 1/4 of a tank. Outside evening temps at the time were 32 degrees. Go figure...
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Old 02-07-2014, 08:13 PM   #16
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I just checked my LP gauge... I'm at 1/3 tank even though the inside monitor shows 2/3. It must be right on the edge of tripping down to the next level. I've been running the furnace at between 68 and 70 at night, higher in the morning and evening when I'm still up, for 11 nights since filling up. The night temperatures have been mostly in the high 40's; a few in the 30's, a few in the 50's. I paid $4.15 a gallon; 2/3 of 24 is 16 (is it 2/3 or 24 or of 20, not sure about that?). Probably should start using the electric heater a little more since the last eleven nights have cost me ~$65. Hmmm...
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Old 02-07-2014, 09:41 PM   #17
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Unless your gauge works off of a scale that monitors the weight of the bottle, it's not accurate. Don't rely on them or it could be a cold night. Even chassis mounted LP tanks the gauge is not entirely accurate.
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Old 02-07-2014, 09:48 PM   #18
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I'm confused. I thought the whole point of the gauge on the bottle was to give a more accurate measure of the amount of propane remaining. Sounds like you're saying these gauges aren't accurate. How, then, are we supposed to know how much propane we have?

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Old 02-08-2014, 08:51 PM   #19
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We went through about 1/4 of a tank with the heat on 68 a few weeks ago. Granted, it was 20* outside.

The gauge is based off of pressure IIRC, so dont rely on it. It will read less when cold, more when warm.

For reference, the furnace in a friends toter is also a 35k btu, and it will burn 1/2 gallon of propane per hour running constantly. Most wont run constantly, but cycle on and off. When we camped a few weeks ago when it was 20*, Id say it was running about 40 minutes out of every hour or so.

The other mitigating factor is whether your Dometic t-stat is set to D1 or D2, because that has a major impact on how long the furnace will run.

The fridge and water heater use very minimal propane. The fridge would run something like a few months on the propane supply, water heater probably about the same. A gallon of propane should last the fridge about 5 days, probably about the same for the WH.
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Old 02-09-2014, 02:03 AM   #20
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Quote:
Originally Posted by Ford Idaho View Post

What if anything was the water heater and fridge running on?
If gas this would all add up quick.
The fridge was on shore power and the water heater was off. (RV was winterized)
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