E10-BCANCT1W-23 Laing AutoCirc E10 Series Circulator with Timer, Cord and Fixed Thermostat Act E10 Undersink Hot Water Recirculation Pump .The industry's first retrofit hot water recirculation pump designed specifically for tankless water heater applications, just got better with high efficiency ECM technology. ACT E10 lead-free pump was designed with high efficient electronically commutated permanent magnet motor (ECM/PM technology) specifically for potable water systems. This unique design is perfect for retrofits, no recirculation pipe required, and systems with tankless water heaters. GPM given is max.Energy effiecient ECM motorBuilt-in temperature controlNo return line requiredIncludes a 6-foot power cordMaximum flow rate: 4 gallons-per-minute