Propeller Pumps in general (such as these Seio and SunSun/Perfect Pumps) provide a much "Softer" broad water flow rather than the more harsh and directed flow of traditional Power Head Water Pumps.
In particular, the Premium AAP Seio pump (which although is not as well known of late, has a long history with aquarium professionals) has a nice spread of the water volume so as to provide good circulation without strong streams of underwater current; this is particularly desirable in planted freshwater (even more so Amazon River set ups) and reef saltwater aquariums.
The proven and long lived Seio pumps we sell have the perfect flow for aquarium applications under 100 gallons, where as most propeller pumps, (including the AAP/SunSun we sell) are too powerful for small to medium sized aquarium applications.
The Economy AAP/SunSun vibration/propeller pumps combine reliability in a more economical high flow pump.
These are the same propeller circulation pumps made by SunSun and sold under many different brand names including AquaTop & Hygger.
Both are optimum choices for use with wave makers or similar, since the propeller impeller design lends itself to the constant on and off cycles of such devices.
This said, Propeller pumps are not for everyone as these have almost no head pressure and are not meant for running attachments or pumping water outside of your aquarium (including pre-filters). As well there are times you may need or desire the more directed current of a traditional power head water pump.
See Also: Pump Specifications

Seio Super Flow Propeller Water Pumps
• Magnetic Mount Included
• Ceramic Shaft
• Ceramic Rotor Bearing
• High Flow Rate
• Energy Efficient
• Propeller Impeller rotor
• Extremely compact design
• A simple "plug & go" pump; it can be placed just below the water level for best results with air injection with simple air intake tubing (a small winding of Teflon Tape around this air tubing will provide a better fit) OR deeper if this is not desired.
• Superior durability AND price as compared to other Propeller Pumps currently available

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*1.9" x 1.5" x 2.5"(4.8 x 3.8 x 6.3 cm.)
*Cord Length 6 feet/180 cm.
*Flow Rate 320 gph (1200 LPH)
*115 V/ 4.5 watts
*Recommended glass thickness; 1/4" or less
*Click on picture to enlarge

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*3.2" x 1.9" x 2.3"(4.8 x 3.8 x 6.3 cm.)
*Cord Length 6 feet/180 cm.
*Flow Rate 530 gph (2000 LPH)
*115 V/ 7.5 watts
*Recommended glass thickness; 3/8" or less

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*5.5" x 2.16" x 2.6"(14 x 5.5 x 6.6 cm.)
*Cord Length 6 feet/180 cm.
*Flow Rate 620 gph (2400 LPH)
*115 V/ 8 watts
*Suction Cup Attachment/Mounting
SunSun/Perfect Propeller Water Pumps
• High Flow Rate
• Energy Efficient
• Propeller Impeller rotor
• Extremely compact design
Please Click on the picture to enlarge for a better view
AAP/SunSun Pump Model JVP 201 - $19.99
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*Economical with DUAL adjustable (directional) and separate propeller/vibration pumps in one unit!
*Simple/Economical Suction Cup Attachment/Mounting
*3.2" x 1.9" x 2.3"(8.1 x 4.8 x 5.85 cm.) for each unit
*Cord Length 6 feet/180 cm.
*Flow Rate 1585 gph- 6000L/h (Combined Pumps)
*115 V/ 12 watts (combined)
AAP/SunSun Pump Model JVP 102 - $18.99
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*Economical adjustable (directional) propeller/vibration pump
*Simple/Economical Suction Cup Attachment/Mounting
*4" x 3" x 3.5"(10.6 x 7.6 x 8.9 cm.)
*Cord Length 6 feet/180 cm.
*Flow Rate 1320 gph- 5000L/h
*115 V/ 12 watts