I have been living in my home which I built 10 years ago using propane for heat. Gas was less than $1/gallon 10 years ago, but now over $3.00/gallon. Spent close to 1500.00 in propane alone in 2011 and was cold in house! Purchased Hardy heater last October 2011. It has been one of the best purchases I have ever made. Yes, it burns wood, but I have free ample supply. In really cold weather(teens) it burns approx wheelbarrow and half per day. Whatever I set the thermostat on, it kept it there no problem. Have 2600+ sq ft house and even opened door to garage at times to warm it! This heater heats my house water and does great. Never run out of hot water. Using even in summer just to heat water and electric bill has been approximately $40/month less. Payback in 3 yrs...by then gas will probably be closer to $4/gallon and I will have a warm house for pennies a day!