Catalytics work great but they have a big drawback - water. I have one in my 20' camper. If kept running for long periods of time, you'll have water running down the windows. On a hunt a few years ago, it was so cold that we had to keep it running during the day to keep the water from freezing. After 3 or 4 days of steady burning, our matches were too damp to strike and we had ice on the insides of all the windows. All of our clothes and bedding felt damp, too.
Did you have any windows cracked?
Yup. I won't run any propane device without it. Normally the byproducts of burning propane are water and CO2. However, if it burns incompletely, like without enough air, some of the exhaust will be CO instead of CO2. Nasty stuff.
When it's cold and snowy, like in our case, the humidity in the air won't allow the ventilation to remove enough water to keep the camper dry.
Back to the OP question: How about a Buddy Heater? For traveling, it can be run on 16oz cylinders so a hose isn't a problem. Strap it to a table leg or something.
