VersaFlo wet-rotor technology circulator pumps are seal-less, oil-less, whisper-quiet and virtually maintenance free. Because they are lubricated by the water they pump, there’s no fan (a common source of noise and vibration). The pumps are designed for commercial and residential buildings - heating systems, hot water recirculation, snow melt, and hydronic applications. These pumps can easily replace three-piece dry runners without piping modifications.