Grundfos UPS65-30/4 Glandless Circulator Flanged Bare - Grundfos pump for Low Temperature Hot Water Heating service is part of the large UPS range of pumps which are canned rotor, centrifugal pumps for circulating water in heating systems and smaller air-conditioner systems in commercial buildings. Based on glandless pump or canned rotor technology the pumped liquid cools and lubricates the motor and rotating parts. Grundfos UPS65-30/4 incorporates three duty ranges that can be changed manually by switching the speed selector plug inside the terminal box. When used in conjunction with appropriate controls, multispeed saves energy by controlling the motor speed to system requirements, as fluctuations in ambient temperature can account for increasingly high running costs in heating systems. This is where multispeed pumps three speed duty range really saves energy.