I am going to keep these bins outside in my "junkie shed." No heat, but gets water in every now and then. I got them from work and we are under new management and they are little less given than the old managment team. I figure go with treated wood, so I would not have to it for a while. I was going to put drain holes on the bottom piece of wood and put cardboard down before I fill it up, I burn with nut coal from UAE.
Thanks for all the input.