It was 16 degrees this morning and I tool my small pry bar out to take the ice out of the bowls the ice was over an inch thick I busted 6 of them out and that took about 5 to ten min I was on my way past the first one that I did and it was frozen again that's no good ! Going to lowes tomorrow to buy supply's to build a light bulb heater that goes inside a a one hole cinder block a cord a surge protector and a plug in light socket also something thin and fire proof to go between the rubber bowl and cinder block I will let you know how I make out and what the cost is ! I would buy a base for 50 bucks but I need to many of them not feasible I'm told to use a 40 watt bulb