The Rinnai 20216 0803EBS PCB Kit (also listed as U306?0701?1?E-E) is a genuine OEM printed circuit board replacement kit designed for use in Rinnai RU and RUC series tankless water heaters. This PCB kit controls essential system functions including ignition, temperature regulation, and safety protocols, ensuring optimal and safe performance of the unit. Key Features OEM Rinnai control board (PCB) for tankless water heaters Manages core operational functions: ignition, temperature, flow sensors, and diagnostics Restores full performance and ensures safety compliance Reliable and durable for continuous residential or light commercial use Pre-configured for seamless replacement Specifications Part Numbers: 20216 0803EBS, U306?0701?1?E-E Type: Printed Circuit Board Kit Function: Main system control (ignition, heat modulation, diagnostics) Application: Internal system logic and safety control Compatible Models RU80 RU98 RUC80 RUC90 RUC98 C Series Why Choose This Item Choose the Rinnai 20216 0803EBS PCB Kit for restoring control system integrity, ensuring energy-efficient operation, and protecting your tankless water heater from system failures. As an OEM replacement, it guarantees fit, function, and long-term reliability for your Rinnai RU/RUC unit.