Unless you can get it fixed, I would highly recommend that you get a small propane heater that can be run from 1 lb. bottles, 20 lb. tanks, or both.  Mr. Buddy has several models that do this very well and safely.  Just crack open the vent in the bathroom while running it.  You should be able to find this type of heater at any many stores, especially hardware stores.

cheers John

I too suspect that a lack of ventilation and/or a faulty internal thermostat in the furnace is the culprit.

Bought this years ago for our Dynamax 36' XL as we boon docked a good deal of the time. Was plenty enough to keep it warm at night down to 30 degrees, haven't used it yet in the Pod but have to believe it will be more than plenty. I plumbed it into the stove feed on our 179. Very quite and extremely efficient.

https://www.amazon.com/Camco-57331-Olympian-Wave-3-Catalytic/dp/B000BUV1RK/ref=sr_1_1?ie=UTF8&qid=1512363186&sr=8-1&keywords=olympian+heater+wave+3 -

I would hope that anyone planning camping in temperatures regularly below 32F would have dual propane tanks, preferably 40 lbs. instead of 20 lbs.  Even so, if your furnace is running virtually all the time, which I imagine it would be at -20F, you would not even have quite a five day supply of propane if you weren't burning it for anything else.

Few travel trailers are stock built with insulation truly adequate for that kind of weather.  Ice fishing travel trailers are designed for it.

The 1 lb. propane 'bottles' don't last long at all when used for heating a space, especially when you're talking about sub-freezing and more especially sub-zero outside temperatures.  Connecting to a 20 lb. or larger propane tank is really a must.

The Mr. Heaters are a fine heat source.  It is absolutely critical that the Pod be adequately ventilated (just open a window a few inches and/or the vent on the ceiling) and that an operational carbon monoxide detector be used.

That being said, I'm now convinced that the Olympian Wave heaters are far superior.  They are catalytic heaters and convert most of their heat to radiant heat (i.e. 'light' heat) rather than convection heat (i.e. heated air).  This makes them far superior at directing heat in a specific direction (e.g. toward you) rather than that heat going straight up to the ceiling.  Those using them in RVs report using much less propane with them.  Further, since they are catalytic, once they warm up, they produce absolutely zero carbon monoxide.  They still require ventilation because they produce carbon dioxide and need fresh oxygen, but this is far less dangerous than carbon monoxide.  Regardless, a carbon monoxide detector should still be used in any enclosed space when anything is being burned.

I used to live in North Dakota, where -50F happens with some regularity every winter.  At -44F, propane no longer boils.  You could open the tank and stare at the liquid propane.  Those with no other heat source literally have to build a fire with something like wood around their propane tank to heat it up enough for it to vaporize.  Now, most people just get underground tanks, which are sufficient to keep them from getting that cold.

It's a different world below zero.

I think you would be okay. I have used my buddy heater in my ice fishing shanty for years an never had a problem. it does have a few drafts in it. Can keep it warm inside 70 ish, when it is 5 to -5 outside.

Until recently, I thought the same.  But the chemical reaction occurring in a catalytic conversion is not exactly the same as that of 'normal' combustion.  I'm not a chemist, so don't ask me about the specific chemical reactions occurring.

Here's another source indicating properly functioning catalytic heaters produce virtually no carbon monoxide.

https://catalyticovens.com/catalytic-heater-emissions/

At any rate, even a catalytic heater still needs an adequate oxygen supply to function.  If it becomes oxygen starved, the catalytic reaction may stop and normal combustion can occur, leading to the production of carbon monoxide.  So ventilation is still necessary.  And as I said before, you still need a carbon monoxide detector in the space, and I wouldn't recommend that anyone go to sleep with any type of heater running.

Regarding the efficiency, I agree that both non-vented heaters like the Mr. Buddy and catalytic heaters like the Olympian Wave are virtually 100% efficient.  But that doesn't mean that they are both producing the same type of heat.  Recall that there are three types of heat: conduction (warming an object directly), convection (warming an object indirectly via air), and radiant (infrared, radiant heat).  At least 80% of the heat produced by a catalytic heater is radiant, whereas the majority of the heat produced by regular propane heaters is by convection.  The problem with warmed air is that it rises to the ceiling in an enclosed space, making the top of the space warm while the bottom is still cool or even cold (i.e. stratified air).  Radiant heat, however, can be literally pointed at what you want heated (e.g. yourself).  Consequently, it is very possible for you to use less propane to achieve the goal of keeping yourself warm, which is precisely what many of those who have used both types of heaters report.

You seem to be trying to say that there is no meaningful difference between a Mr. Buddy and a catalytic heater.

The heater consumes air from the space in which it is used.

Sufficient fresh air must be provided to assure complete

combustion of the fuel gas. Improper combustion can result

in the production of poisonous carbon monoxide, causing

danger of asphyxiation and death. Carbon monoxide is an

odorless, colorless gas. Early signs of carbon monoxide

poisoning resemble the flu, with headache, dizziness and/

or nausea. If you have these signs, heater may not be

working properly. Get fresh air at once! Have heater serviced.

Symptoms of carbon monoxide poisoning often cannot be

­ •­ Lack­of­ proper­ ventilation­ air­ will­ lead­ to­­ ­