I happened to notice that the amperage draw for centrifugal pumps is much lower than vane or impeller pumps. For instance the Groco centrifugal rated at 17 gallons per minute(gpm) draws 6 amps whereas the 4 gpm vane or impeller pumps use 6-10 amps. Mike _____________________________________ Capt. Mike Maurice Beaverton Oregon(Near Portland)