Installed new Hayward Variable Speed Pool Pump in the beginning of July 2013. Has cut my pool electrical consumption by 75%. The pool is just as clean as with the old pump. Variable-speed pumps are the ultimate way to save energy. Most single speed pumps are oversized when compared to medium-head pool pumps such as Hayward’s Super Pump. The all-new Super Pump VS is right-sized, particularly for applications with 1.5” plumbing, providing tremendous energy savings that result in an even faster return on investment. You actually run the pump at a lower RPM then the single speed units but move about the same amount of water per minute. The lower RPM reduces the KWH usage. My old pump ran at 3200 RPM and used about 1.2 KW per hour. I now run the new pump for the first 2 1/2 hours at 2700 RPM which consumes 650 watts per hour, then it shifts down to 1500 RPM for the next 9 1/2 hours consuming 174 watts per hour. On average the pool pump now consumes about 4.1 KWH per day as opposed to the old pump consumption of 14 KWH for the same runtime.