Best water bowls or heaters?

[Cluck17]

I think I am getting a water bowl/heater for hens for winter and I’m not sure which one to get. Which ones do you use? Any suggestions?

 

[Cluck17]

Definitely in the outside run though so it has to be water-proof

 

[Haydog03]

There’s a couple heated water-bowls I’ve found for my ducks. This one was my favorite! They might work for chickens, too!
https://www.tractorsupply.com/tsc/product/farm-innovators-round-heated-pet-bowl-6-qt