The E14 Circulation Pump has a highly efficient, clog resistant open impeller that is dynamically balanced with carbon bearing for smooth ultra quiet operation. Its motor has an ultra quiet spherical design and is designed for continuous operation. All ratings are within working limits of the motor. A high density ceramic bearing ball and graphite impeller bearing cap are designed for high efficiency and long life. The pump's unique patented design has no mechanical seal which is a potential leak path.