I have looked for a propane single-burner stove (without its own regulator since the line is already low-pressure regulated) that doesn't say "For outdoor use only", but haven't found even one. So I purchased this stove which I'm using inside my van. I have not found any stove that explains WHY they say "For outdoor use only". So can someone explain the technical reason for this warning, what's different about indoor propane stoves, and what I need to do to make mine indoor-safe?