The Beckett 2100 GPH 78 Watt Submersible Pond, Waterfall, Stream, Water Garden Pump is a powerful, energy-efficient submersible pump for circulating water in fountains, ponds, and waterfalls. This magnetic drive pump, with a built-in frequency controller, reduces power consumption compared to a traditional pump. Designed for continuous, submerged operation, this durable pump is built to last. At 78 watts, this energy-saving pump has a maximum flow is 2100 gallons per hour, with a maximum pumping height of 20 ft. Ideal for creating medium-sized waterfalls or for ponds up to 4200 gallons. The pump features a low water shut-off sensor. It automatically shuts off when it detects that the water level is low. It restarts when it senses the proper water level. This preserves the life of the pump. Its hardy plastic casing ensures durability, and the generous front screen protects the inlet from debris. The epoxy-encapsulated submersible pump is oil-free, making it safe for use in ponds with fish and plants. This pump is compatible with 3/4 in. and 1 in. ID tubing and has a 15-foot cord.