Quote Originally Posted by Great-Kazoo View Post
The Big Buddy has an O2 sensor / shut off. Unless you really are sealed off w/out ANY outside airflow from other rooms, the O2 issue is ALMOST non-existent .
Everyone should have the detectors already in place.
Yeah, mine shut off after about 4 hours while I was using it to heat my garage (I was conducting a test to see how well it could heat my garage - Answer: not very well) You'll visibly notice that it isn't burning very well if there isn't enough O2.