The Rheem PCB Kit, part number RTG20329P, is a vital component for Rheem tankless gas water heater systems. This kit includes a printed circuit board (PCB) that serves as the central control hub for the unit's operation, managing various functions such as temperature regulation and system diagnostics. Engineered with precision and reliability in mind, the PCB ensures efficient performance and safety. Specifically designed for Rheem units, this kit guarantees seamless integration and optimal functionality, ensuring consistent hot water supply.