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. The E5 was introduced in March of 2008 as the premier upgrade/replacement circulation pump. The compact size and flexible positioning (can mount on its side or vertical on the sidewall of the equipment compartment) has won it favor with Hot Spring dealers worldwide. This little jewel uses less electricity and moves more water per minute than all previous Silentflo pumps. When you refill your spa and power it up this "next generation" magnetic drive, it slowly ramps up to insure that it's well primed with water. The position of the suction/inlet is 1-11/16" from the floor which is the same as the Silentflo 5000 & Silentflo 5002. The return/discharge is 4-1/4" off the floor same which is also the same as the Silentflo 5000 & 5002. This flexible pump can also mount on its side without the need to secure it to the floor of the equipment compartment with the attached bracket. The impeller is accessible simply by unscrewing the top ring of the pump for easier cleaning if needed. This circulation pump draws water through the circulation pumps filter (1989 forward spas) and then pushes it through the heater, ozone injector (if equipped) and back into the spa through the heater return fitting or floor drain. The E 5 circulates twenty percent more gallons per minute than the Silentflo 5000 yet uses nearly half the wattage. Impressive!