Rinnai Replacement 17E PCB Main. Specially designed for the Rinnai 17e model, this replacement part ensures your water heating system operates at its best. Benefits of Regular Maintenance: Enhanced Efficiency: Regular servicing can ensure that your water heater operates at peak efficiency, reducing energy bills. Longer Lifespan: Preventing buildup and replacing worn-out parts can significantly extend the life of your water heater. Safety: Ensuring that your appliance is in top condition minimizes the risk of leaks or malfunctions. Installation & Safety: Always ensure that installation and servicing are carried out by a qualified technician familiar with Rinnai products. Turn off the gas supply and disconnect power before beginning