To flush your Rinnai RL94eN High Efficiency Plus Tankless Water Heater, follow these general steps: Turn Off Power: Ensure the power to the unit is turned off. Close Water Supply: Close the water supply valves to stop water flow to the unit. Attach Flushing Equipment: Connect a flushing pump and hoses to the inlet and outlet ports of the water heater. Flush with Clean Water: Use clean water to flush out any debris or sediment from the unit. Continue until the water runs clear. Reopen Water Supply: Once flushed, reopen the water supply valves. Turn On Power: Turn the power back on and check for proper operation. For detailed instructions, refer to the Installation & Owner Manual that came with your unit or visit the Rinnai website for specific guidance.