I am very impressed with my Empyre 200 outdoor wood boiler. I previously owned an indoor wood boiler that heated just my house using seven to eight cords of wood per year. Several of my friends who own their own outdoor wood boilers told me to expect to use fifteen to twenty cords of wood to heat my house, three car garage, and hot water with new boiler heater. I was pleasantly surprised when I used only eight cords of wood last year! An added benefit was a savings of twenty to thirty dollars per month in my electric bill form heating my water with the Empyre outdoor boiler, too.