Well, I will throw my .02 in. <img src="/images/graemlins/smile.gif" alt="" />

I really don't see the difference between this and hundred of open flame heaters that were in use and still in use in lots of houses in rural Oklahoma. I have one in my garage that I use in the winter and some of my fondest memories of growing up were sitting in front of the one the three my grandmother had in her house, playing cards and listening to the wind howl outside...knowing I was warm.

I use a similar product in my hunting camp, a coleman Black Cat heater..same catalytic principal...the Mr. Buddy is a better design and more expensive. I use mine throughout the hunting season, it will run for 6-7 hours on a 1 lb can...and here is a shocker...I run it while I am sleeping, but then again...there is no way that where I am sleeping is airtight..it's a converted 48' refer trailer, so no worries about the CO poisioning, and most times we crack a window in the other room to be sure.

Using it in your house in a small enclosed area might not be advisable...but depending on how big and airtight your house is...I wouldn't think twice about running one in the winter in mine...once again...I know it's not airtight and I don't think the volume of CO that this little thing can put out would be dangerous...but then I'm not a doctor or anything. <img src="/images/graemlins/smile.gif" alt="" />