I was wondering about what kind of reservoir you used for the water. My bottles are nipple water feeders and they love them. We made them from plastic water bottles and a bike water bottle bracket with screw in nipples.
I use a poly 55 gallon drum, I installed a float valve so I can hook up a hose or leave a hose hooked up and it auto fills, and I put in a 250W titanium aquarium heater in there this year (hung at proper height as to no touch the bottom) with an separate thermostatic control module and held it at around 45° all winter... There is also a hot water heater spill pan under the barrel that catches almost all the drips and diverts them outside the coop...
Oh and a Weber grill dome that was from a destroyed grill that fits perfectly on the barrel and prevents them from roosting on top...
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