We have a large plastic hanging bucket waterer with nipples. We bought this electric drop in water warmer that goes right into the bucket. The water has never frozen. We live in New Hampshire and this heater is now almost 5 years old and still works perfectly. LOVE it, and highly recommend!
https://www.amazon.com/Pet-Products...t=&hvlocphy=9002438&hvtargid=pla-385063163213
https://www.amazon.com/Pet-Products...t=&hvlocphy=9002438&hvtargid=pla-385063163213
