I've used this product for years with good results. I keep one or two spares (catch them on sale like this one) because if ine goes bad in the middle of the winter the cost (and inconvenience) is usually high! These are *** in the pet stores in the winter and even online. They usually last for 4-6 seasons, but since they are exposed to the harsh elements eventually the elements will stop working. I use this both for my dog and a couple of separate ones for my cat colony. Very low power consumption (just enough to keep the water liquid). If you have outside animals in the northern states get one (or two) of these for the winter.
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