I recently replaced a Pentair WhisperFlo 1.5hp WFE-6 (Model 011514) single speed, circa 2000, with a Pentair WhisperFlo 1.5/0.19hp WFDS-6 (Model 011512) two speed.
One very noticeable difference between the two pumps is how much hotter the WFDS-6 motor runs. Higher case temperature (touching...