Mr Buddy heater question

vtchris wrote:
This unit is sold with an automatic shut off if it senses low oxygen....I thought it was designed to use on low (or high) while sleeping. Of course I would keep a window cracked to be on the safe side.

You are betting with your life on that oxygen sensor. Personally, I wouldn't have an open flame appliance inside my RV whether I was sleeping or awake, without having lots of ventilation. Why would I want to breathe CO, other hydrocarbon byproducts, or have a low oxygen environment?