I have the Mr. Heater, the two burner model. Also with the Oxygen sensor, anti-tip shutoff and fan. It has three settings, low, med, and High. On high runs thru the two 1lb bottles pretty fast. I have the Hose attachment with a 25lb bottle rigged up underneath the stand. I have a fresh filled tank so should be good rest of the season. It says will heat 400 sq feet. The stand is 4X8 and 7' high. But I have from 1 to 4 windows open depending on the weather. They swing up and prop open. I've been meaning to change them over to sliders for a few years now. I had to fork out $139 for it this year, but with my 10% discount at Lowes made it $125. Think it was right at $100 the first time around 4 years ago.