How to Maintain a Tankless Water Heater
Keeping a tankless water heater clean is crucial for its longevity and performance
Tankless water heaters are a modern marvel for many homeowners, offering on-demand hot water, energy savings, and a compact design to fit almost any space. However, like any hardworking appliance, they require consistent care to keep operating at peak efficiency. Professional plumbers often see tankless heaters underperform or fail prematurely simply because regular maintenance was overlooked. If you want to maximize the performance and lifespan of the tankless water heater, understanding how to maintain it—and when to call in the experts—makes all the difference.
Why maintenance matters for tankless water heaters
Tankless water heaters are durable and highly efficient, but not immune to the effects of mineral buildup, debris, and general wear and tear. Over time, hard water can deposit minerals inside the heat exchanger, reducing efficiency and, in severe cases, causing damage that leads to costly repairs or early replacement. Routine maintenance is crucial for running your system smoothly and ensuring a reliable hot water supply.
How often should a tankless water heater be serviced?
A common question from homeowners is how often service for a tankless water heater is necessary. The answer depends on a few factors, including the hardness of your water, the age of your unit, and how heavily it’s used. As a general rule, tankless water heater yearly maintenance is recommended for most households. In areas with particularly hard water, servicing tankless water heaters every six months may be necessary to prevent excessive mineral buildup. Regular professional inspections help catch minor issues before they turn into major headaches.
Regular cleaning: The foundation of tankless heater maintenance
Keeping your tankless water heater clean is the first step toward long-lasting performance. Dust, dirt, and mineral deposits can accumulate inside the unit, especially in homes with hard water. Begin by turning off the power and water supply to the heater. Carefully remove the access panel and check for any visible debris or buildup. Use a soft brush or cloth to gently remove dust and loose particles. This simple routine helps prevent blockages and keeps all components functioning properly.
Flushing the system: Removing mineral buildup
One of the most critical aspects of tankless water heater maintenance is flushing the system to remove mineral deposits and sediment. If left unchecked, these deposits can clog the heat exchanger and reduce the unit’s efficiency. Most manufacturers recommend flushing the heater at least once a year, though homes with hard water may require more frequent attention.
To flush the system, start by shutting off the power and water supply. Connect hoses to the flush valve ports, and use a small pump to circulate a vinegar solution (or a manufacturer-approved descaling solution) through the heater for about an hour. This process dissolves mineral buildup inside the heat exchanger. Once complete, rinse the system thoroughly with clean water before restoring power and water. If you’re not comfortable with this process, a professional plumber can handle it efficiently and safely.
Checking and cleaning the air intake filter
The air intake filter is a small but vital component that prevents dust and debris from entering the unit. A clogged filter restricts airflow, reduces efficiency, and even causes the system to overheat. To maintain the filter, locate it on the top or side of the heater, carefully remove it, and clean it using a soft brush or a vacuum. If the filter appears damaged or excessively dirty, replace it with a new one. Regular filter maintenance supports optimal performance and extends the life of your tankless water heater.
Inspecting for leaks and corrosion
Routine inspections can catch minor problems before they escalate. Look for signs of water around the unit, such as puddles, damp spots, or water stains on nearby walls or ceilings. Check all visible pipes and connections for drips or moisture. Even a minor leak causes water damage or mold growth if left unaddressed. Tighten loose connections, and if you spot corrosion or significant leaks, contact a professional plumber for a thorough assessment and repair.
Monitoring performance and identifying warning signs
Paying attention to your tankless water heater’s day-to-day performance can help you spot issues early. Watch for:
Inconsistent water temperature
Decreased water pressure
Unusual noises coming from the unit
Longer wait times for hot water
Any of these symptoms may indicate a need for maintenance or repair. Addressing small issues promptly can prevent more serious problems and keep your water heater running efficiently.
Professional maintenance: The value of expert care
While homeowners can handle some maintenance tasks, annual professional servicing is strongly recommended. A professional plumber conducts a comprehensive inspection, including:
Flushing and descaling the heat exchanger
Checking and adjusting gas pressure (for gas-powered units)
Inspecting and cleaning the air intake filter
Verifying proper venting and exhaust
Testing all safety controls and sensors
Examining electrical connections and wiring
This level of detailed maintenance not only helps prevent breakdowns but also ensures your unit is operating safely and efficiently. Professional servicing is also an excellent opportunity to ask questions and receive personalized tips for maintaining your specific model.
Winterization: Protecting your tankless water heater in cold climates
If your tankless water heater is installed in an unheated space, such as a garage or basement, winterization is essential to prevent freezing and potential damage. Insulate exposed pipes and the unit itself, and consider installing a recirculation system to keep water moving through the pipes during cold spells. If you plan to be away from home for an extended period during winter, draining the unit completely can prevent freeze-related issues. Your plumber can recommend the best winterization strategies for your local climate and installation.
Understanding the warranty and record-keeping
Most tankless water heater warranties require regular maintenance to remain valid. Take time to read and understand your warranty terms, and keep detailed records of all maintenance and professional service. These records can be invaluable if you ever need to file a warranty claim or demonstrate that you’ve followed the manufacturer’s care guidelines.
Benefits of proper maintenance
The advantages of maintaining a tankless water heater go far beyond just avoiding breakdowns. Consistent care provides:
Extended unit lifespan: Well-maintained heaters can last up to 20 years or more.
Improved energy efficiency: Removing mineral buildup and keeping components clean ensures your heater uses less energy.
Reliable hot water supply: Regular maintenance helps prevent unexpected cold showers or interruptions in service.
Lower repair costs: Catching and addressing small issues early reduces the risk of expensive emergency repairs.
Peace of mind: Knowing your water heater is in top condition means one less thing to worry about in your busy life.
When to call a professional plumber
While basic cleaning and filter checks can be handled by most homeowners, some aspects of tankless heater maintenance are best left to professionals. If you notice persistent issues such as fluctuating water temperature, error codes on the display, or visible corrosion, don’t hesitate to contact a licensed plumber. Professional servicing ensures that your unit is thoroughly inspected, cleaned, and adjusted for optimal performance.
The bottom line
Maintaining a tankless water heater is a straightforward process that pays off in reliability, efficiency, and long-term savings. By following a regular cleaning schedule, flushing the system as recommended, inspecting for leaks, and scheduling annual professional service, you’ll enjoy consistent hot water and peace of mind for years to come. If you ever feel uncertain about any aspect of maintenance, reach out to a trusted local plumber. With expert care and attention, your tankless water heater will continue to deliver comfort and efficiency to your home, day after day.
Trust the licensed plumber at Simba Plumbing when in need of leak detection and repair, sink installation and repair, toilet installation and repair, sewer services, water heaters, tankless water heaters, and automotive shutoff valve solutions in Phoenix. Our services are affordable and aim to offer the best results. Call today to book a service and ask about our special offers.
