I never seen a factory installed Catalytic heater in any RV or enclosed truck camper.
(pop ups leak so much you're probably safe).
Contemporary ones all use heat exchanger, fan driven furnaces that need electricity to work.
Catalytic heaters use O2 to function. Would you turn on a propane stove when you went to bed ? Same thing.
"If used in an unventilated space, any propane heater will consume oxygen until there is inadequate oxygen for human breathing. The oxygen sensor in the ET or ODS models senses a low oxygen level and turns off the heater if the level gets too low for safety.
Although an oxygen sensor makes the heater safer, it restricts the heater to use at altitudes below about 5000 to 7000 feet, depending on brand. For many RVers, this is a really major disadvantage, since some of the nicest camping locations are at higher altitudes, and the heater's primary use may be for the cool nights found year-round at high elevation.
Because these heaters use oxygen and emit water vapor and carbon dioxide (not carbon monoxide!), any space in which the heater is used must be ventilated (a window opened slightly), both to add new oxygen and to get rid of the excess moisture. Olympian recommends one square inch of free air opening per 1000 BTU/hr of heat output for "rooms of average airtightness". (This means that for the Wave 6 heater, an RV window 2 feet wide would would be cracked open 1/4 inch.) I have found that our travel trailer is leaky enough to provide sufficient oxygen for two people to breathe while the heater is in use without opening windows. A friend with a large high-end fifth wheel trailer has also found this to be true. We ventilate anyway, largely to keep the moisture level reasonable. But it's comforting to know that if we forgot to open a window before going to bed, it wouldn't kill us.
This comment should be understood in the context of our own tolerance for reduced oxygen levels. We have camped at altitudes of 10,000 feet and hiked as high as 14,000 feet without problem. Individuals with impaired heart/lung function, or those who suffer from altitude sickness at much lower elevations, will want to be much more careful about ventilation."
Carbon dioxide will also kill you just as dead.
Your money, your life.
