Another point that I forgot to mention is that if you plan to use some form of extra heat (light bulbs, heat tape, etc.) you will probably do it only during the cold weather. Here in NE bees don't do much propolizing during the cold weather. They are too bussy trying to stay warm. But as Robo stated previously, and I agree, is the fact that with my "new" SBB the heat tape (or light) stays underneath the screen. The most that could happen is that you get some wax droppings on the tape. The temperature does not go any higher than 50 deg. F so it won't burn. Also, the heat tape is on a galvanized 1/2" screen so most of the stuff will continue to fall to the bottom tray.