I use one outside of the coop in winter, when the flock free ranges. If it's so frozen that the ice doesn't pop out of it when I stomp on it upside down, I leave it out there in the sun (hopefully) and the ice comes out later in the day. That's why you will need two or three of them, and a jug to carry water out there.
Those of us without rocks everywhere can also have frost free hydrants everywhere, so water is available in winter without carrying it on the ice and snow...
Mary
Those of us without rocks everywhere can also have frost free hydrants everywhere, so water is available in winter without carrying it on the ice and snow...
Mary