Abstract: A venturi-type water pumping device is provided which is immersible in a body of water to pump warm water from its lower depths toward its surface to maintain the water surface free of ice. The water pumping device comprises a hollow, generally cylindrical housing having opposite outwardly flared ends with a propeller and drive motor mounted within the housing. When the device is suspended in a body of water and the propeller rotated, warm water is drawn upwardly through the housing and emerges as a column of water directed upwardly toward the water surface. The water pumping device is adapted to be suspended either vertically or at an angle to the vertical. The device is also adapted to operate while at rest on the bottom of the body of water.

Abstract: A venturi-type water pumping device is provided which is immersible in a body of water to pump warm water from its lower depths toward its surface to maintain the water surface free of ice. The water pumping device comprises a hollow, generally cylindrical housing having opposite outwardly flared ends with a propeller and drive motor mounted within the housing. When the device is suspended in a body of water and the propeller rotated, warm water is drawn upwardly through the housing and emerges as a column of water directed upwardly toward the water surface. The water pumping device is adapted to be suspended either vertically or at an angle to the vertical. The device is also adapted to operate while at rest on the bottom of the body of water.