So we built a cat shelter, a "boiler" and bought it to keep it warm inside. We are in northern Montana and temperatures here often reach -40ºF in the winter (and have been known to drop to -60ºF from time to time). Because of the potential problems that could arise, I built the assembly to give the heater its own space. Here's the story: I took a heavy board, glued (using three different glues) a ceramic heater around the center, made a secure attachment for the power cord, hung a basket on it with a big gap on all sides, and closed it. - Fasten the power cord to the basket in turn so that when you open the basket, the cable bends instead of pulling, and then locks the basket. This prevents cats from getting too close to the heater's inlet or outlet, and if they are pressed against any part of the basket there is still enough airflow to keep the heater working without the risk of overheating or fire. The heavy board and wide footprint also prevent the assembly from tipping over, although even then this would not be a problem as this heater cannot be detached from this board without the use of a crowbar and hammer, and the heater itself is glued to the board. We also have a security camera in the cauldron, so we'd see if that happened. I was going to use two other nylon loops to attach the wire holder to the heater, but it turns out that after the glue dries on the heater, you can take the assembly and shake it vigorously and the heater won't move, ie unimportant. The heater itself has relatively low power; this is more than enough to keep the cats a little warmer than outside. This, together with the fact that there is no wind inside the cauldron and there is also a large heating pad, provides a safe and cozy environment for the cauldron's occupants. The heater is then removed (or hammered out) and replaced. If necessary, the entire assembly can be removed through one of the hatches in the turret.
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