The Laguna PowerHeat 315-watt De-Icer keeps and maintains a thawed, open area at the pond surface, allowing toxic gases from fish respiration and decomposing organic matter to escape. Features: N/A Brand: Fluval Manufacturer Part Number: PT1642 Manufacturer: Rolf C. Hagen (USA) Corp. Model: PT1642 Assembled Product Dimensions (L x W x H): 19.00 x 10.40 x 10.00 Inches