All the talk against running a garden hose down a fenceline and attaching to a float system in the coop befuddles me. You're not filling individual drink glasses with water directly from the hose, so the water being hot is irrelevant. If the float is positioned in a small vessel like a 5 gal bucket set into the ground or cut down for the desired height based on your breed, once a chicken drinks a small amount of water, a small amount of water is then allowed past the float valve and that HOT water then mixes with the much larger volume of tank water and is immediately cooled to a reasonable temp. It's not a problem for me here in Arkansas to run a 100' hose down my fenceline to a "stall waterer" with a float, sold for horses, that holds about 4 gals and the rim is about 12" high, perfect for my RIR flock. And no poopie contamination either!! Oh, and I like the aquarium water heater idea mentioned previously and will be trying that this winter, when I'll be using a more manual watering system.