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Old 12-27-2023, 08:30 PM   #1
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2002 25' Safari
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Post Furnace en route

Should my furnace work on route if I have it turned on and my batteries are fully charged. Or will I have to run my generator to keep it warm? Thx in advance.
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Old 12-27-2023, 09:55 PM   #2
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The furnace fan can drain your battery (or batteries) quickly if you are not hooked up to shore power or a generator. You write "on route" or "en route." If you mean running the furnace during driving/towing, it's not something I would do.
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Old 12-28-2023, 06:02 AM   #3
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I have never used the furnace while driving, however, I preferred tousle the furnace on overnight stops encountered to our destination.
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Old 12-28-2023, 08:09 AM   #4
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I wouldn't think it a good idea to run the furnace while driving down the road - too much wind for the furnace to properly vent itself, and/or too much wind for the flame & pilot to stay lit and burn properly.
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Old 12-28-2023, 09:12 AM   #5
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OP: your post is unclear about what you are trying to accomplish. Are you traveling in cold weather and want to keep your plumbing from freezing? (Quick answer: winterize) Or do you want a warm trailer when you get to your destination or lunch stop? (Quick answer: Leave your travel clothes on for the first half hour)
As others have stated, the fundamental principle is that airflow on the road pulls heat from the trailer and GREATLY reduces the efficiency of the furnace. You'll end up searching for a place to refill your propane tanks with nothing to show for it.
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Old 12-29-2023, 05:15 AM   #6
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Thanks for the replies. The problem occurred last January 27 as we left southern Texas for mid Texas and had some water in our tanks. Temp went from 32F to 30 F and it would have been beneficial to have heat to just not drain the tank. Woke up in Kerrvile hotel with freezing rain and ice over everything. The testy full-day drive on icy Hwy 10 to El Paso was in that temp all day. My thoughts were to get some heat to keep away the frost but the furnace would not run steady....must be some kind of safety switch that cuts out its operation. My thoughts would be to run the generator in cases such as these to keep things warm enough to avoid freeze-up. That begs the question ? How long will the furnace run on 12 Volts? BTW all turned out well with no issues. Just planning ahead but from the advice.... draining everything might be the best solution.
Thx again for input.
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Old 12-29-2023, 11:35 AM   #7
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As mentioned by Richard 5933, the wind while driving probably caused your furnace to quit working. If the flame goes out or there is a problem with the amount of air flowing past the sail switch, the furnace will turn off. A generator providing power will not change what the external airflow causes.


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Old 12-29-2023, 12:32 PM   #8
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I'm thinking at those temperatures with the sloshing the chances of freezing solid are low. And I doubt the heater would do much since the tanks sit underneath. The furnace helps keep the lines from freezing but winterization using a portable air compressor to blow out the lines doesn't take much effort.
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Old 12-30-2023, 05:40 AM   #9
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The furnace does direct warm air to the area around the tanks and in a campground setting can help keep things from freezing down below. But, on the road I'd suspect that the air flow from the road will negate any benefit from the furnace.

If I were going to drive often in questionable weather, I think that I'd look into installing heating pads under my tanks. They'll keep the tanks warm and create a large thermal mass to help protect other nearby plumbing. They can be run off 12vdc and powered by the solar system.
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