www.pmmag.com/articles/91935-quiet-wet-rotor-circulator
Quiet Wet Rotor Circulator
July 2, 2008

Magna from Grundfos is the smart wet rotor circulator that’s adaptable. Wet rotor technology means the pump is oilless and sealless. It has no noisy fan; it’s cooled and lubricated by the water it pumps. Integrated variable speed drive automatically adjusts performance to meet demand, saving energy. Perfect for heating and snowmelt applications.
Circle 40