Hello, What are you fine folks using for heated waterers? My hens have never seen snow so I need to pick up a heated waterer for this winter. I've only seen two options so far, either the heated metal base or the 3 gallon heated hanging waterer. Are there any other options available out there? P.S. I'm sure there is a long thread on this somewhere on the site but I have failed to find it. Sorry in advance.