This AquaMotion™ Hot Water Circulating Pump is a cast iron circulator with a rugged wet motor cartridge type designed for closed loop hydronic, radiant and indirect water heating systems. It has a very low energy consumption, helping you save money and energy costs. The wet motor design allows a quiet, in-line, single-stage, and maintenance free performance. It has a built-in check valve that prevents thermo siphoning and backflow. This pump is acceptable for indoor use only with water applications. NOT FOR USE IN POTABLE WATER APPLICATIONS. For open loops and fresh or potable water, use pumps with bronze or stainless steel housings only.