?Premium Material?- The recirculating pump uses heavy-duty stainless steel pump head, aluminum pump housing and PES impeller, featuring high resistance to stain, water, corrosion, leakage. Brass fittings and water-stop also included, which enbales several years of good resistance. ?Main Parameter?- NPT 3/4 inch (19.05 mm) inlet/outlet. Voltage/Frequency: 110-120V, 60Hz. Rated power: 93/67/46 W. Max pressure: 145 psi (10 bar). Three speed modes. Flow: 40/29/20 LPM (10.4/7.66/5.28 GPM). Max head: 6/4.9/4 m (20/16/13 ft). Fluid temp range: 0? -+212?. ?Humanized Design?- Low noise (around 25dB) and less energy consumption; less cold water waste and waiting time. Instant hot water now enables you to get hot water about 15 seconds compared with 2-3 minutes in the past (note: the kitchen takes about 1 minute to get hot water for the flow restriction). ?Easy installation?- Just a wrench to connect the pump to pipeline, saving the cost of plumbers. Extraly equipped with a common NPT1/2 adapter. The pump with constant circulating hot water prevent the pipe from freezing, which is especially useful for extremely cold areas in winter. ?Wide Application?- Our hot water circulation pump is suitable for a wide range of application scenarios: city buildings, suburban villas, houses, industrial equipment, air conditioning, boilers, solar circulating water and so on.