The Aquael Pond Heater 150W is specially designed for looking after outdoor ponds over the winter. It protects fish in the event of the pond being covered in ice by keeping an area free for oxygen replenishment and gas escape, preventing pond life from suffocation. Even in severe frosts, this heater provides maintenance-free heating and protection against complete freezing of pond water, and allows aeration. This unit includes: Stainless steel heater Stainless steel heater guard Plastic cover dome Polystyrene float Cable length: 10m