15-55-HWR-T Grundfos ALPHA Hot Water Recirculation Pump The ALPHA 15-55 HWR-T is a hot water recirculation pump that operatesusing a wireless temperature sensor that functions like an aquastat. Thepump will activate via the programmable timer in addition to the measuredreturn line temperature. The sensor keeps the water temperature withinan optimal range that is calculated every 12 hours. Head max : 18.05 ft TF class : 110 Approvals on nameplate : ETL, FCC, NSF Pump housing : Stainless steel Pumped liquid : Water Liquid temperature range : 35.6 .. 230 °F Selected liquid temperature : 140 °F Density : 61.35 lb/ft³ Power input - P1 : 2 .. 45 W Main frequency : 60 Hz Rated voltage : 1 x 115 V Maximum current consumption : 0.02 .. 0.65 A Range of ambient temperature : 33.8 .. 104 °F Maximum operating pressure : 145.04 psi Pipe connection : 1 1/4 Pressure stage : PN 10 Port-to-port length : 5 15/16 in