Helix External Pumps are reliable, durable and efficient, ideal for Koi ponds, external filters and low head water falls. Continuous duty, weatherproof motors can be used outdoors without additional protection Not self-priming, but can be used in flooded suction applications or with check valve on suction line Dual voltage motors are shipped 115V but can easily be field changed to 230V Super quiet operation 3 year limited warranty Since these pumps are not self-priming, it is recommended to add a Leaf Basket Priming Pot to the pump (available below). This leaf basket will fulfill two purposes: it will protect the pumps from large debris that may damage the pump, and it will keep water in the pump to maintain priming when the pump is shut-off. SKU Watts /Amps Inlet/Outlet MaximumFlow Rate MaxHead Flowrate, in gph, at Given Head 5' 10' 15' 20' HEX3600 227 / 1.9 2" 3600gph 20.5' 3000 2400 1600 — HEX5000 263 / 2.3 5000gph 20.2' 4300 3500 2400 — HEX5800 296 / 2.6 5800gph 21' 5000 4200 3000 1000 HEX6800 376 / 3.4 6800gph 22.2' 6200 5200 4200 2500 HEX8200 450 / 4.0 8200gph 22.3' 7300 6300 5000 3600 Manual