How to Maintain Tankless Water Heater

You should inspect your tankless water heater annually for leaks, corrosion, and unusual noises. Flush the system yearly to remove mineral buildup, especially if your water is hard. Clean the water filter every few months to maintain flow. Check the pressure relief valve and venting system for proper function and blockages. Monitor the water temperature and inspect electrical and gas connections regularly. Testing the flow sensor helps spot issues early. Keep up with these steps to ensure your unit runs efficiently—and there’s more you can do for long-lasting performance.

Inspect the Water Heater Annually

Although tankless water heaters are low-maintenance, you should inspect yours annually to ensure it runs efficiently and safely. Start by checking the exterior for any visible signs of damage or leaks. Inspect the connections and fittings for corrosion or loose parts.

Make sure the venting system is clear and securely attached to prevent dangerous gas buildup. Test the temperature settings to confirm the unit heats water properly without fluctuations. Listen for any unusual noises during operation, which might indicate internal issues.

Don’t forget to examine the electrical components or gas lines, depending on your model, for wear or damage. Performing these checks yearly helps you catch problems early, extending your heater’s lifespan and maintaining consistent performance.

Flush the System to Remove Mineral Build-Up

How often should you flush your tankless water heater to keep it running smoothly? Experts recommend flushing it at least once a year, especially if you live in an area with hard water. Mineral deposits like calcium and magnesium can build up inside the unit, reducing efficiency and potentially causing damage.

To flush the system, first turn off the power and water supply. Connect a hose to the drain valve and place the other end in a bucket filled with a descaling solution or white vinegar. Then, use a pump to circulate the solution through the heater for about 45 minutes.

Finally, flush the system with clean water to clear out any remaining residue. Regular flushing helps extend your heater’s lifespan and maintain optimal performance.

Clean the Water Filter Regularly

Since your tankless water heater relies on a clean water filter to function efficiently, you should check and clean it regularly. Locate the water filter, usually near the cold water inlet, and turn off the water supply before removing the filter.

Carefully take out the filter, inspecting it for debris, sediment, or buildup that could restrict water flow. Rinse the filter under running water, using a soft brush if necessary to remove stubborn particles. Avoid harsh chemicals or abrasive tools that might damage the filter.

Once clean, reinstall the filter securely and turn the water supply back on. Regularly cleaning the water filter helps maintain optimal water pressure, improves heater efficiency, and extends the lifespan of your tankless water heater.

Aim to clean it every few months or as recommended in your unit’s manual.

Check the Pressure Relief Valve

Before you experience any issues with your tankless water heater, make sure to check the pressure relief valve regularly. This valve is crucial because it prevents excessive pressure buildup, which can damage your unit or cause leaks.

To check it, locate the valve—usually near the water heater’s top or side—and gently lift the lever to let some water flow out. If water doesn’t flow or the valve is leaking continuously, it’s time to replace it.

Always ensure the valve resets properly after testing. Performing this simple check every six months helps maintain safe operation and extends your heater’s lifespan.

Don’t ignore signs like dripping or unusual noises, as they indicate valve problems that need immediate attention.

Examine the Venting System for Obstructions

Regularly checking the pressure relief valve helps keep your tankless water heater safe, but you also need to pay attention to the venting system.

Over time, debris, dust, or even nests can block vents, restricting airflow and causing your heater to work inefficiently or shut down. To prevent this, inspect the vent pipes and exhaust outlets at least twice a year.

Look for visible obstructions, corrosion, or damage. Use a flashlight to check inside the vents for any buildup. Clear away leaves, dirt, or bird nests carefully, and ensure that vent covers are intact.

Proper airflow is crucial for combustion and exhaust removal, so keeping vents clear will help your tankless water heater run smoothly and safely for years to come.

Monitor Water Temperature Settings

Although tankless water heaters provide instant hot water, you’ll want to monitor the temperature settings carefully to avoid scalding or inefficiency. Set your heater between 120°F and 140°F for optimal performance—this range ensures safe, comfortable water without wasting energy.

Check the temperature regularly, especially after maintenance or power outages, since settings can reset or drift. Use your unit’s control panel or app, if available, to make adjustments easily.

Keeping the temperature consistent prevents sudden spikes that might harm you or damage plumbing. If you notice water feels too hot or cold, recalibrate immediately.

Monitoring these settings not only protects your family but also helps your heater run efficiently, reducing energy costs and extending its lifespan.

Inspect Electrical Connections and Gas Lines

Since your tankless water heater relies on both electrical connections and gas lines to operate safely, you should inspect them periodically for signs of wear, damage, or leaks. First, turn off the power and gas supply before examining any components.

Look for frayed wires, loose connections, or corrosion around electrical terminals. Tighten any loose screws and replace damaged wiring immediately.

Next, check gas lines for cracks, rust, or any unusual smells that might indicate a leak. Use a soap and water solution to spot bubbles around joints and fittings, signaling leaks.

If you detect anything suspicious, don’t attempt repairs yourself—contact a licensed professional to ensure your safety and the unit’s proper function.

Regular inspections prevent hazards and keep your heater running efficiently.

Test the Flow Sensor Functionality

Before you start testing the flow sensor functionality, make sure your tankless water heater is turned off to avoid any electrical hazards.

Locate the flow sensor, usually near the water inlet. Carefully disconnect it from the system to prevent damage.

Use a multimeter set to the appropriate setting to check for continuity as you simulate water flow by gently moving the sensor’s internal mechanism or running water through the heater briefly.

If the multimeter shows no signal or erratic readings, the sensor may be faulty and need replacement.

Reconnect the sensor securely, ensuring no leaks or loose connections.

Testing the flow sensor helps confirm your heater accurately detects water movement, essential for efficient operation and preventing overheating or system shutdowns.

Schedule Professional Maintenance Checks

After you’ve tested the flow sensor and ensured your tankless water heater is running smoothly, it’s a good idea to schedule professional maintenance checks. A qualified technician can thoroughly inspect internal components, clean mineral buildup, and verify that the unit operates efficiently.

These experts have the tools and knowledge to detect issues you might miss, preventing costly breakdowns. Regular professional check-ups also help maintain your warranty and extend the heater’s lifespan.

Aim to book a service at least once a year, especially if you live in an area with hard water. By staying proactive and involving a professional, you’ll keep your tankless water heater performing optimally and avoid unexpected repairs down the road.

Don’t wait for problems—schedule that maintenance today.

Frequently Asked Questions

How Long Does a Tankless Water Heater Typically Last?

You can expect a tankless water heater to last around 20 years, sometimes even longer with proper care. Regular maintenance helps you avoid issues and keeps it running efficiently throughout its lifespan.

Can a Tankless Water Heater Work During a Power Outage?

No, your tankless water heater won’t work during a power outage since it relies on electricity to ignite and control the system. You might consider a backup generator or battery system to keep it running when the power’s out.

What Are the Energy Savings Compared to Traditional Heaters?

You’ll save about 20-30% on energy bills with a tankless water heater since it heats water only when you need it, unlike traditional heaters that constantly warm stored water, reducing wasted energy and costs.

Are Tankless Water Heaters Suitable for Large Households?

Tankless water heaters can work for large households, but you’ll likely need multiple units or a high-capacity model to meet simultaneous hot water demands efficiently. Otherwise, you might experience reduced flow or inconsistent temperatures.

Can I Install a Tankless Water Heater Myself?

You can install a tankless water heater yourself if you have plumbing and electrical experience. However, it’s often best to hire a professional to ensure proper installation, safety, and warranty compliance. Don’t skip permits!

Conclusion

By following these simple steps, you’ll keep your tankless water heater running efficiently and extend its lifespan. Regular inspections, flushing out mineral build-up, and checking electrical and gas connections help prevent costly repairs. Don’t forget to monitor temperature settings and test key components like the flow sensor. When in doubt, schedule professional maintenance to catch issues early. Staying proactive ensures you’ll always enjoy reliable, on-demand hot water without hassle.