Hello all, I have been sitting the sidelines here for a while and with my latest build I figured I had better ask the pannel. How large of a finned strip heater should I use - 750w, 1000w, or 1250w. The smoker to be is a 1951 International Harvester with about 12 cubic feet of space. It is packed with nearly 3 inches of fibeglass insulation from the factory. Also it has a steel liner. I would like to stay under 1250w so that I can run it off of a 15 amp breaker. The heaters will be controlled via a Honeywell PID (My dad is a controls and meters guy). I will have a homeade smoke gun on the unit too. There will also be a circulating fan and firebricks to retain the heat. So how much heat do I need?