Title: Not very good - might work in warmer climates
Product review: I was very disappointed in this product. When the air temp got below about 20 degrees, it was all it could do just to keep a very small hole open in the water - mostly it was like crushed ice along the outline of the product itself. Our birdbath is only 18" across (and 3" deep) so I fully expected this to keep a majority of it open. In the end we pulled it off since it was using electricity and essentially doing nothing but making avian snow cones.
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