The WaterPro Serial 3-Load Control System is a highly adaptable and efficient spa control system, built for managing up to three spa components—commonly including a two-speed pump, a single-speed pump or blower, and a circulation pump or ozone system. Powered by a convertible 120V/240V supply, this system delivers flexible installation options and is equipped with a slide-style heater capable of 1.4kW at 120V or 5.5kW at 240V for dependable water heating. It is enhanced with M7 temperature and flow sensing technology for improved safety and diagnostics. With built-in freeze protection, a dedicated 12V spa light circuit, and universal ozone compatibility, this system is well-suited for both new builds and retrofit applications seeking performance, reliability, and energy-conscious operation.