I was interested in a product that would keep my bird bath from freezing during cold months without spending a great deal of money. This bird bath de-icer has accomplished both. Our temperatures have been in the single digits with wind chills well below zero and to my pleasure this heater has kept the water flowing for my birds. Today as I looked out, several cardinals and chickadees were sharing a drink. I am very pleased, as usual with the quality and the price of this product and others that I have found on Amazon.com