Pentair 520857 SunTouch Pool and Spa Booster Pump System with 3-Way Valve, Black/Grey One touch function - no complicated routine to memorize Ability to program pool and spa and two additional features. All circuits in the system can control four operating schedules (maximum six total schedules per system) Supports 4 features circuits for programming convenience Compatible with gas or electric heaters, heat pumps, and solar systems