This freeze proof chicken water uses an electric heat cable around the PVC that houses the chicken nipples, an aquarium heater and small pump to circulate heated water down throughout the PVC run. These three components are run from a temperature controlled plug. I also added an aquarium filter to keep the water clean.

Frost King HC12A Automatic Electric Heat Cable Kit: https://www.amazon.com/Frost-King-HC1…

Homasy 80 GPH Submersible Water Pump: https://www.amazon.com/gp/product/B00…

Whisper In-Tank Filter with BioScrubber: https://www.amazon.com/Whisper-Tank-F…

EHEIM Jager Aquarium Thermostat Heater: https://www.amazon.com/EHEIM-Jager-Aq…