I have an older Jotul 602 that puts out a lot of heat. There is no built in flue damper so I use a stove pipe damper. My sister has a new Jotul F3 that dosent put out as much heat. It burns bright and looks great. It has a built in flue damper. I am wondering if a stove pipe damper would improve the heat output? We burn the same firewood that is spilt small and is well seasoned. Thanks, Danny