Originally Posted by nealmccarter
We used the Mr. Buddy catalytic heater in our pop-up.
The Big Buddy, Portable Buddy, and Hunting Buddy heaters from Mr. Heater
are not of the catalytic type. They are unvented heaters, but use a flame rather than catalytic combustion. The glowing tiles hide the flame, so most people don't realize this. In practice, I don't think it matters much.
These heaters can be set up to run on low-pressure propane from the trailer's regulator, although it is perhaps more common to just run a hose to a remote high-pressure supply.