A self-propelled cleaning apparatus for cleaning the submerged surface of a pool or tank, the apparatus comprising: a water pump that includes a reversible electric pump motor having a driveshaft with opposite ends that extend from opposite ends of the electric pump motor, a first propeller operatively connected to one end of the drive-shaft and a second propeller connected to the opposite end of the driveshaft, the axis of the driveshaft extending along a longitudinal axis of the apparatus, the first and second propellers configured to rotate simultaneously in a common rotational direction by the reversible electric pump motor; a housing having an interior in which the water pump is mounted, the housing having a first water jet discharge port positioned at one end and a second water jet discharge port positioned at the opposite end of the housing, each of the discharge ports selectively being in an open position while the other is in a closed position to control the directional discharge of a water jet that is sufficient to propel the apparatus in a direction of movement corresponding generally to the longitudinal axis of the apparatus; a water jet discharge conduit positioned between the propeller and the water jet discharge port at the respective ends of the apparatus; and a water jet discharge valve positioned downstream each of the first and second propellers, each water jet discharge valve respectively controlling the opening and closing of the first and second water jet discharge ports, the operation of each water jet discharge valve being responsive to the flow of pressurized water from the water pump; and wherein the pressurized water flowing through the interior of the housing is discharged through one of the water jet discharge ports in the form of a water jet to propel the apparatus in a direction that is determined by the direction of rotation of the reversible electric pump motor. a water pump that includes a reversible electric pump motor having a driveshaft with opposite ends that extend from opposite ends of the electric pump motor, a first propeller operatively connected to one end of the drive-shaft and a second propeller connected to the opposite end of the driveshaft, the axis of the driveshaft extending along a longitudinal axis of the apparatus, the first and second propellers configured to rotate simultaneously in a common rotational direction by the reversible electric pump motor; a housing having an interior in which the water pump is mounted, the housing having a first water jet discharge port positioned at one end and a second water jet discharge port positioned at the opposite end of the housing, each of the discharge ports selectively being in an open position while the other is in a closed position to control the directional discharge of a water jet that is sufficient to propel the apparatus in a direction of movement corresponding generally to the longitudinal axis of the apparatus; a water jet discharge conduit positioned between the propeller and the water jet discharge port at the respective ends of the apparatus; and a water jet discharge valve positioned downstream each of the first and second propellers, each water jet discharge valve respectively controlling the opening and closing of the first and second water jet discharge ports, the operation of each water jet discharge valve being responsive to the flow of pressurized water from the water pump; and wherein the pressurized water flowing through the interior of the housing is discharged through one of the water jet discharge ports in the form of a water jet to propel the apparatus in a direction that is determined by the direction of rotation of the reversible electric pump motor.