I've been using a heated 3gal. poultry waterer (which I haven't had to turn on yet). It's not that easy to refill and seems like it will be a real pain in the winter outside. I certainly don't want to slosh around with it inside. I was wondering if one of those heated dog bowls might be whole lot easier. My birds don't get much debris in their water except what is stuck to their beaks. Seems like it would work. Has anyone tried one of those? Some of them are pretty big. 2 gallons. What size do you have?