Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Fails when you need it most - poor quality

Only one year old and no longer working. Has a 3 year warranty; however, not very helpful when you have a frozen pond and don't want to lose valuable Koi. This unit replaced a Laguna de-icer that at least made it through 2 seasons before quitting. Does anyone know of a high quality de-icer???