The Osburn 2400 wood stove is a beast. Its in the basement of our ~2400 sq/ft (including semi-finished basement) house and has kept the place above 67 degrees F without running above 1/3 thermostat opening despite it being windy and 15 out. I feel opening up the thermostat more than 1/2 might result in something akin to a mini nuclear meltdown.