Pentair WhisperFloXF® 023035 WhisperFloXF®Max-E-Pro VS Pump 5 HP - The Max-E-ProXF VS Commercial Pump is the first five-horsepower variable speed pool pump that runs on single-phase or three-phase power. It’s an economical, combined motor per drive solution for both HMAC (hotel, motel, apartment, condominium) or large residential installations. This Pump provides sophisticated, energy-saving pump technology without the high costs typically associated with independent pump per external drive setups.