TetraPond water garden experts have developed the newest addition to the product line dedicated to the health of pond fish. The TetraPond 300W De-Icer is a safe and effective winter survival solution for all pond fish. Concealed within an artificial stone, this energy efficient de-icer melts and maintains an opening in the layer of ice and snow above your pond. This enables harmful gases to escape, providing your fish with a toxic-free environment all winter long. This thermostatically controlled pond de-icer is effective to -20°F (-30° C) and is a UL-Listed product. Dimensions: 10.5" x 5.5" with a 15 foot power cord.