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I did something similar to this....didn't use a stepping stone on top, used a thin piece of metal taped down the cinder block. Overall, it worked, but for me it didn't work when it stayed below freezing for several days in a row.
I also had to play around with the wattage of the bulb according to the temperature. I had to end up using a 100W bulb. But, it may differ for some & according to where the waterer is kept, whether inside the coop or outside & the type of waterer...whether galvanized or plastic, etc.
Mine would still freeze, at least at the top at times in a plastic waterer. Also, it was hard for me to check on the light bulb as you couldn't see it without moving the waterer & whatever you have on top of the block, so many times the way you knew the bulb had blown out was noticing frozen water.
Not sure if I did something wrong or what, but that was my experience.
Not sure what I'm gonna do yet this winter. I may try the sanding the heated dog bowl, or I may try the cookie tin water heater. I might try keeping water in the coop close to a light on a timer on these shorter daylight hours. I might even invest in one of the heated chicken waterers (from what I've seen not much more expensive than the heated dog bowl).
Mine was outside