The Navien 30014699A Water Pressure Sensor is a monitoring component designed to measure and regulate water pressure in compatible Navien tankless water heaters and combi-boiler systems. It works by continuously detecting system water pressure and sending accurate signals to the control board, allowing the equipment to maintain safe and efficient operation. Commonly used in residentia... https://www.partshnc.com/30014699a-navien-tankless-water-heaters-water-pressure-sensor