Designed with small and preformed ponds in mind. When used as a submersible the Thermo-Pond Perfect Climate works great in all ponds up to 3,000 gallons, 18" deep or less. Uses only 300 watts! Thermostatically controlled. Will not burn preformed ponds or liners, no additional parts required. Perfect for small or preformed ponds. Inlets allow use with air or water pumps. 15' cord. Covered by two year manufacturer's warranty.