The Navien Tankless Water Heaters 30027274B PCB Control Board GWC303-6M NPE-2 is an essential electronic replacement component designed for compatible Navien NPE-2 Series tankless water heaters. This printed circuit board manages key heating operations by processing signals from sensors and coordinating temperature regulation and system functions. Used in residential and commercial HV... https://www.partshnc.com/30027274b-navien-tankless-water-heaters-pcb-control-board-gwc303-6m-npe-2