I am sure this has been talked about over and over. I did a search but most are for chickens. Right now I use a bucket upside down in a big metal bowl (pic below). I did buy a heated dog dish, but with 8 ducks I know they would go through it way to fast & unsure how to keep them out of it. What is the best thing you have used?
Hens go broody when you don’t want them to… and won’t go broody when you do. 