The Rheem-Ruud RTG20235D Control Board is an electronic replacement component designed for compatible Rheem and Ruud tankless water heaters. It manages essential operating functions by processing input signals from connected sensors and coordinating burner operation, ignition, and temperature regulation. This control board helps maintain consistent hot water delivery while supporting ... https://www.partshnc.com/rtg20235d-rheem-ruud-control-board