This heater saves lives. My 420 gallon backyard pond has been having terrible outbreaks. I added insulation around the above ground part and covered all but a quarter of the top part. On the coldest days, my pond maintains a temperature of at least 50 degrees. Which helps while I treat my breakout. I don't have to keep it on all the time. Fortunately, I am very impressed with this heater. The fish also seem to enjoy running around. Highly recommended
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