I did something sort of similar a few months ago. Except I would swear to this day that the power strip the thermostat (and therefore the CHE) was plugged into was turned off. We had been testing on a tank for our corn to go bioactive and I had decided the bulb was too weak and to skip it for UTH instead since it couldn't penetrate heat low enough for a hot spot and this corn isn't an avid climber.
So instead of going onto the tank, I put it on the shelf below after flipping off its power strip. I remember clearly turning off the power strip (instead of the switch on the lamp since it was hanging in back hard to reach) before setting it down, so we're still scratching out heads as to how it was turned on. As far as I can guess, the dog must have stepped on the power strip just right to turn it back on right before we left.
But we got back from lunch and it had made some nice charring on a shelf of a 55 gallon aquarium stand. One with the plastic coated particle board shelves. No fire, luckily. It was just On since the probe was hanging in the tank still, nowhere near the lamp on the shelf below.
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