Yamaha SP20ET Dewatering Electric Submersible Trash Pump

The Yamaha SP20ET is an electric submersible trash pump built specifically for dewatering, meaning it's designed to clear standing water down to a shallow remaining depth rather than handle general utility pumping. Built with a heavy-duty cast iron body and a 2-inch side discharge port, Yamaha states it can bring a flooded surface down to near 2 inches of water left behind.

What "dewatering" means for this pump

Unlike a general trash pump built to move water from a distance, this unit submerges directly in the standing water, with Yamaha rating its flow at 79.3 gallons each minute, which works out to roughly 4,760 gallons in an hour through the 2-inch port. That makes it suited to flat surfaces like rooftops, parking structures, parking lots, basements, and crawl spaces rather than deep excavation dewatering.

Before you set it up

Power draw sits at 660 running watts from a 1/2 hp motor on a 110-volt circuit, so confirm your outlet and breaker can support that load. A uni-body power cord, water-tight by Yamaha's description and running 20 feet long, ships with the unit, but a float switch for automatic on/off operation is sold as an optional accessory rather than included standard. Double mechanical seals bathed in liquid paraffin and a thermal overload protector are built in to guard the motor if the pump runs dry or overheats.

Common questions

Does it turn off automatically when the water is gone? Only with the optional float switch, which is not included standard.

How much does it weigh for moving around a jobsite? Yamaha lists a dry weight of 36 lbs.