Get the myth busters to do it! Take your fire pit and set the heating stones on the grate that you use to cook stuff on then they wont get dirty. Youll have the fire under them heating them up and theyll stay nice and food grade. Then set them in the log full of sap and have the next ones warming up. Should work good. Just keep alternating them so you can fire your log evaperator real steady and quality product in no time. Let us know the gph figures. Theee( thats not a bad idea at all)rooon