[JoeProBono]

Good point, I have the Mr. Heater Big Buddy Propane Heater that is advertised for both indoor and outdoor use.
I’ve never used it and keep it only as an emergency backup. Would not use it without a carbon monoxide detector despite the claims.

[FlJoePa]

Another update from WBRE:

WBRE link here

Says the cabin was on private property. That makes it more down in the valley w/ the Amish than up on the mountain - where it's mostly state game lands.

[Squawk 8888]

Catalytic heaters like yours are extremely safe.