Ships directly from manufacturer Aquascape EXT External Pond Pumps are designed for water feature applications requiring high flow with high efficiency from a non-submersible pump. These pumps operate oil-free, have low RPM, and boast a fan-cooled motor that provides quite operation and long life. The junction box on the pump motor allows for 115V or 230V electric to be customized on-site to meet each electrical requirements of the project. Oil-free, low RPM motor for quiet operation and long pump life Semi-closed vane impeller for efficient flow and handling 3/4" solids Totally Enclosed Fan-Cooled (TEFC) motor All inlets and outlets include 4 bolt flange Model EXT 12000 EXT 12000-3P EXT 18000 EXT 18000-3P SKU 45049 45051 45050 45052 Maximum Flowrate 12,500gph 18,400gph Maximum Pump Head 21' 45' Inlet 3" Outlet 2" Maximum Power 1100 Watts 736 Watts 3300 Watts 1932 Watts Maximum Amperage(115V / 230V) 10 / 5 3.2 / 1.6 30 / 15 8.4 / 4.2 Motor Size 3/4 HP 1 HP 3 HP Phase Single 3-Phase Single 3-Phase Power Cord 10' None Included Data Sheet Manual Special Note for 3-Phase MotorsThe 3-phase motors can be used with an optional variable frequency drive (VFD). A VFD (not included) is a controller that varies the voltage and frequency of the motor, allowing you to control the water flow rate. The VFD can be used to schedule the pump to slow down during certain hours of the day (to conserve electricity) and speed up during other hours (to boost performance).