Portable Heater ..elect (watts/amps) big buddy or catalitic?

The fan in a standard heater causes most of the "issues" when dry camping. I have no idea if newer RV furnaces are those "98% efficient" type (plastic stovepipe) but the only heater I could ever live with while dry camping was an Olympian Wave Heater. Otherwise I burned so much fuel for heat and electricity I might as well have gone and parked in an RV park. Some folks wanted to take me by the shoulders and shake and yell "You can't do that (use a non vented catalyst heater for 20 years)". They're dead now.