Is my empty Slow Cooker a serious hazard?

I was using my slow cooker to humidify my house by filling it with water and heating it on high with the lid off. It was working fine but I had to refill the water every 24 hours. I left to spend the night elsewhere and forgot to unplug it. I realize it is probably bone dry and I won't be home until tomorrow.... show more I was using my slow cooker to humidify my house by filling it with water and heating it on high with the lid off. It was working fine but I had to refill the water every 24 hours. I left to spend the night elsewhere and forgot to unplug it. I realize it is probably bone dry and I won't be home until tomorrow. How dangerous is this?? Will my house burn down while I am gone???
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