Yes, it was me. I've tried MANY things for heating water and, seriously, this works the best for me. I'll re-post a photo below.
I use a couple of these depending on how many birds I have. They are INSIDE the chicken house so not in the direct wind outdoors. If it's above about 14/15 degrees F, it does well and doesn't start freezing from the top down. When it gets really cold I just take out a fresh water in the morning.
If I know it's going to be really cold, I'll use heated water when I take it out before I leave for work....again, if below "0" or near "0" F, I check it as soon as I get home to be sure it hasn't begun to freeze from the top down. I very seldom have that problem, but sometimes it will start to freeze a bit around the glass edges and the top...not often.
So here's the deal:
Put grit into a heated dog bowl deep enough to to form a stable base and raise the waterer up to the rim level; put water in the grit to conduct heat. Place one of these 2 kinds of waterers on the bed of grit depending on which sizes you have.
Quart size heated bowl fits the chick sized water bases which cost about $2 and can be used with any regular mouth canning jar or a 5 lb honey jar which holds 1/2 gallon. This photo shows the 5 lb. honey jar (apx. 1/2 gal. water). (I used this size all last winter successfully with all age birds.)
The 5 quart larger dog bowl fits a 2 gallon waterer. I HAVE NOT TRIED THIS MYSELF. Hoosier Cheetah was trying it last year so I'm hoping he will stop in and comment on how it worked out for him.
Photo by @hoosiercheetah