The E2000 is a lap pool on one end, and a hot tub on the other measuring 20′ long x 89″ wide and allowing for cooler water in the lap pool and hot water in the hot tub. For those seeking better overall wellness, including your physical, mental, and emotional states, the E2000 may just be the machine that brings it all together. The E2000 Combines Endless Pools’ exclusive resistance current with luxurious jetted massage seats all wrapped into one package. Endless Pools E-Series Resistance current gives you a swim experience that is absolutely unmatched by any other swim spa on the market. A If you are a serious swimmer, the E-Series by Endless Pools is the obvious choice. dd the optional underwater treadmill and you have the ultimate fitness machine.