Submersible pump is a type of water pump designed to operate underwater—typically fully submerged in a water source like a well, borehole, tank, or sump. The motor and pump are sealed together so water doesn’t enter the electrical parts.
A 500 W rating means the motor uses 500 watts of power to drive the pump—roughly equivalent to about 0.67 HP (horsepower).
Submersible pumps come in variations depending on how and what they pump