I live in Minnesota and it gets really cold. I've been reading all the posts about heated waterers. It looks like the plastic ones suck. Most people are happy with the galvanized heated base one, or some others like the heated dog bowls. Can someone please tell me the pros and cons to these. Remember, this is for cold temps. Is the galvanized waterer (fountain) also heated, or just the base? Do the birds walk in the heated dog bowl, or do you set this up higher and they don't?