The MaxFlo ™ VS500 variable-speed pump from Hayward® is designed to replace most medium-head pumps. The powerful performance of this optional upgrade provides up to 80% energy savings over single-speed pumps, paying for itself faster than the larger, more expensive models. Optimize performance at the 1.65HP level Up to 80% energy savings over single-speed pumps Operates at a significantly lower decibel level, making it exceptionally quiet compared to single-speed pool pumps Optimal Energy Efficiency Variable Speed Pumps are designed for optimal energy efficiency. The incredible energy efficiency of the MaxFlo™ VS500 variable-speed pump from Hayward, is attributed to the permanent magnet, totally enclosed fan-cooled (TEFC) motor technology, offering improved operation and reliability Advanced Hydraulic Design. The advanced hydraulic design of Variable Speed Pumps delivers high speed, ultra-quiet operation and a longer lifespan than traditional options. OmniLogic® Compatible. The MaxFlo™ VS500 seamlessly incorporates into the OmniLogic® automated system for incredibly simple operation.