Neat idea, but appears unsafe for chickens. Looking in the picture, it appears the griddle is sticking out enough for chickens to stand on and possibly burn their feet.
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Ah, appearances aren't everything - that's perception.
Of course you cannot tell from the images posted that the griddle is not energized in the photo. Nor can you discern the temperature setting of the griddle control.
We are not cooking the water. The griddle is set to its lowest 'warming' setting such that, when the temperature drops below 40 degrees or so, the griddle begins cycling on and off attempting to maintain a 'warm' surface - in spite of the 'below 40' ambient temperature. (Last nite, ostensibly down to 20 degrees F if the forecast was spot on).
Over time, the intermittent heat source warms the SS pan, the wooden supports, the plastic bucket and the 3-5 gallons of water therein creating a bit of a thermal mass inside the sealed bucket.
I suspect, indeed venture to guess, that the temperature of the griddle' center seldom reaches eighty degrees and the exposed peripheral edges seldom reach two thirds of that.
I suspect a hen, were it disinclined to fly up on one of the perches, might safely rest her head on the griddle's edge all night long without injury or discomfort.
As we have learned, chickens share much of their structure with dinosaurs and the like from some fifty million years before the griddle came to be. Does the expression 'tough old birds' ring a bell?