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Introduced in 2008 as a premier upgrade circulation pump. The compact size and flexible positioning (can mount on its side or vertical on the sidewall of the equipment compartment) makes it a very versatile little pump.
The new E5 replaces the Watkins SilentFlo® 5000 and Silentflo 5002 circulation pumps on all Hot Spring and Tiger River spa models from 1986 to 2009. 
When you refill your spa its "next generation" magnetic drive slowly ramps up to insure the unit is fully primed with water.
The position of the suction & return inlets are the same as the Silentflo 5000 & 5002.
The impeller is easily accessible for easier cleaning when required.
It circulates twenty percent more gallons per minute than the Silentflo 5000 yet uses nearly half the wattage.