Came in yesterday am and found the heater thing plugged in and warm, four hours later it was still on and all the water had evaporated away. I turned it off and left it in place - I used to clean up after people, but learned that if you do - you end up with people that need to be cleaned up after.
Please do not leave heaters on - clean up after yourselves!!!
Note it’s on the granite stone with a sign that says “Do not store or place things on”.