Ask us anything

How do I perform routine maintenance, such as descaling, on the Noritz NC380 tankless water heater?

Routine maintenance, including descaling, is crucial for ensuring the efficient and long-lasting operation of your Noritz NC380 tankless water heater. Over time, mineral deposits can accumulate in the heat exchanger, reducing its efficiency and potentially causing performance issues. Descaling helps remove these deposits. Here's a step-by-step guide on how to perform routine maintenance, including descaling, on your Noritz NC380 tankless water heater:

Important Note: Before you start, ensure your safety by turning off the gas supply and electrical power to the water heater. You may also want to wear safety gloves and safety glasses, as you'll be working with potentially hot and corrosive solutions.
Tools and Materials Needed:
* Screwdriver
* Wrench
* Submersible pump or circulation pump kit
* Hose and hose bib adapter
* Descaling solution (commercial descaler or vinegar-water mixture)
* Bucket or drain pan
Step 1: Turn Off the Water Heater
Turn off the gas supply to the Noritz NC380 by closing the gas valve. Also, turn off the electrical power to the unit by switching off the circuit breaker or disconnecting the power supply at the electrical panel.
Step 2: Gather Supplies
Collect all the necessary tools and materials, including the descaling solution. If you're using a commercial descaler, follow the manufacturer's instructions for dilution and usage. If you prefer a natural solution, you can use a mixture of white vinegar and water (about a 1:1 ratio). Fill a bucket with the descaling solution.
Step 3: Connect a Pump
Attach a submersible pump or circulation pump kit to the service ports on the Noritz NC380 tankless water heater. Consult your water heater's manual to locate these ports.
Step 4: Pump the Descaling Solution
Turn on the pump to circulate the descaling solution through the heat exchanger. Let it run for at least 30-60 minutes to dissolve and remove mineral deposits and scale. Monitor the solution's color, and when it appears clear, you can stop the pump.
Step 5: Drain the Solution
Disconnect the pump and drain the descaling solution into a bucket or drain pan. Dispose of it properly according to local regulations. Connect a hose to the cold-water supply and run fresh water through the heat exchanger for a few minutes to flush out any remaining descaler or debris.
Step 6: Reassemble and Restore
Close the drain valve and remove the pump. Reconnect any disconnected service ports. Turn on the cold-water supply and check for leaks. Once confirmed, turn on the gas supply and restore electrical power.
Step 7: Check for Proper Operation
Turn on a hot water tap to ensure the water heater is working correctly and that there are no issues with hot water delivery.
Step 8: Schedule Regular Maintenance
To prevent future buildup, consider installing a water softener if you have hard water, as it can significantly reduce mineral deposits. Additionally, schedule regular maintenance checks as recommended in your water heater's manual.
Additional Tips:
If you notice stubborn scale buildup, you may need to repeat the descaling process or consult a professional technician for assistance.
Always follow the manufacturer's instructions for the descaling solution and procedure, as they may vary depending on the specific model of the Noritz NC380.
Keep records of your maintenance activities, including the date of descaling, for future reference.

In conclusion, performing routine maintenance, such as descaling, on your Noritz NC380 tankless water heater is essential to maintain its efficiency and extend its lifespan. Regular descaling helps prevent mineral deposits and scale buildup, ensuring that your water heater operates at peak performance. Remember to follow safety precautions and the manufacturer's instructions at all times to ensure a safe and effective maintenance process. If you're uncomfortable performing these tasks, it's advisable to hire a professional plumber or service technician.
Connect to virtual expert

Our virtual experts can diagnose your issue and resolve simple problems.