Perfect Climate Deluxe Pond De-Icers are the perfect choice for any pond or water garden. The first pond de-icer designed with all ponds in mind, both small and large. The Perfect Pond De-Icer is designed to keep open water in ponds. The de-icer is thermostatically controlled and all heating elements are enclosed so they will not harm or burn your pond liner. Perfect Climate Pond De-Icer is a floating pond de-icer by attaching the optional floater. When the unit is used as a floating pond de-icer it will keep a hole in the surface ice to help a proper gas exchange take place helping to protect your fish from toxic gas buildup.