Bests & Worsts Reviews from Amazon

I bought two of these. Not only does the one work amazingly well in the bird bath, but the other one I put on a pot of dirt, scatter dirt and small gravel over it, and that heater got even more action than the heated bird bath! And that is saying a lot since I am in Northern Wisconsin and we get sixty below zero nights in the winter! (meaning we get 60, or more, below zero nights during the winter months). Birds would not only eat the gravel and the small pile of sunflower seeds, but would sit on the heated dirt and enjoy the warmth and because the container had an inch lip around, it kept a bit of the wind off the birds too. I highly recommend to any serious bird watcher, that if you are going to heat water, you might want to consider buying two and heat a dirt bath too!