I went to the hardware store yesterday to buy one of these on your recommendation and right on the front of the box, in big letters, it said FOR OUTDOOR USE ONLY. Funny how the kerosene heaters are good for closed spaces but the propane ones aren't.
I have owned mine for over 10yrs & use it every winter in my garage w/o any problems. Regardless of what it says I refuse to smell the stink of kerosene, which I believe is even worse. What I find odd is if kerosene can be used inside a garage then why did a friend that used kerosene heater experience CO poisoning because of it?????? I'll stick w/Propane & just keep a window cracked open.
If you're worried about it just use a CO detector w/the propane heater...Joe