The Navien Tankless Water Heaters 30021775A 3-Way Motor Valve is a motorized flow-control component designed for Navien NFC series condensing combi-boilers. It operates by automatically changing the water-flow path between the space-heating and domestic hot-water circuits according to system demand. This helps maintain proper water circulation and supports efficient heating and hot-wa... https://www.partshnc.com/navien-30021775a-3-way-valve-motor-fugas-nfc