Grundfos UP15-10B5 is a 1/25HP bronze circulator pump with 1/2" Sweat inlet/outlet connections and is typically used in open loop heating and hot water recirculation applications, such as radiant, solar, storage tanks, as well as chilled water cooling and many others. Bronze housing of the UP15-10B5 model protects the pump from corrosion and sweat connections allow for easier and faster installation and eliminate the need to purchase and install pump flanges.