Ranger- I didn't really think that the pot would work either but tried it because my little heater went out- I used 4 of these for a room about 10 x 10 and after about an hour that room was toasty at close to 80 degrees! - This is something great to have around your closet- cabinet or grow in the winter in case you lose power- it will keep a place warm enough in an emergency.
Just burning candles warms a place up too - but the pots are a little safer when it comes to fire hazard.