How Often Should Tankless Water Heaters Be Cleaned? Tips from Installation Experts
Tankless water heaters also known as on-demand or instant water heaters are a favorite among homeowners for their energy efficiency, compact design, and ability to provide endless hot water. But like all appliances, they require regular care to perform their best. One of the most common questions we hear is: how often should tankless water heaters be cleaned? In this blog, we’ll answer that question, explain why maintenance matters, and show how professional installation and service can extend the life of your investment.
Why Cleaning Your Tankless Water Heater Matters
Tankless water heaters heat water as it flows through the unit. Over time, especially in areas with hard water, minerals like calcium and magnesium can build up inside the system. This sediment reduces efficiency and may eventually lead to costly damage.
Cleaning your tankless unit isn’t just about performance it’s about protection. A clean system heats water faster, lasts longer, and consumes less energy.
So, How Often Should Tankless Water Heaters Be Cleaned?
In general, tankless water heaters should be cleaned at least once per year.
However, frequency depends on several factors:
- Water Hardness: Homes with hard water (high in minerals) should clean their systems every 6 to 9 months.
- Usage Volume: If your household uses a lot of hot water (e.g., large families), more frequent cleaning may be needed.
- Manufacturer Recommendations: Always follow your specific model’s guidelines for cleaning and maintenance.
Neglecting to clean your system can lead to buildup on the heat exchanger, corrosion, reduced flow rate, and even complete failure over time.
What’s Involved in Cleaning a Tankless Water Heater?
Cleaning or descaling a tankless water heater is a relatively straightforward process, but it’s best done by a professional to ensure safety and effectiveness. Here’s what the cleaning process includes:
1. Power Down and Disconnect
The system is turned off and disconnected from its power and water supply to ensure safety.
2. Connect a Pump and Descaling Solution
A submersible pump circulates a descaling solution (often white vinegar or a specialized cleaner) through the heater’s internal components to break down mineral deposits.
3. Flush the System
After about 30 to 60 minutes of descaling, the system is flushed with clean water to remove any remaining solution and sediment.
4. Reconnect and Test
Once cleaned and reconnected, the technician runs the system to make sure it’s heating water efficiently and operating as expected.
Signs Your Tankless Water Heater Needs Cleaning
Even if you're not tracking your cleaning schedule, your water heater might be giving you warning signs:
- Fluctuating Water Temperatures
Are you getting hot water one minute and lukewarm the next? Mineral buildup may be interfering with the heating element. - Slower Flow Rate
Reduced water pressure can result from internal blockages caused by sediment. - Strange Noises
Popping or rumbling sounds often indicate limescale buildup around the heat exchanger. - Error Codes on the Display
Many modern units will flash a code when maintenance is overdue.
If you’re noticing any of these symptoms, it’s time to schedule a cleaning.
Installation Quality Impacts Maintenance Frequency
Did you know that the way your tankless water heater is installed can affect how often it needs to be cleaned?
Professional installers consider your water quality, home layout, and usage patterns when placing and configuring your system. For example:
- Hard Water Areas: Pro installers may recommend a pre-filter or water softener to reduce mineral buildup.
- Proper Venting and Drainage: Reduces moisture-related issues and improves airflow to the unit.
- Correct Sizing: A properly sized system won’t overwork itself, reducing internal wear and tear.
At Motivated Mechanical Solutions, we specialize in expert installation that sets your system up for long-term success minimizing maintenance and maximizing performance.
Benefits of Professional Maintenance Services
While some homeowners tackle basic descaling themselves, we recommend professional maintenance at least once a year. Here's why:
- Correct Tools & Solutions
Professionals use commercial-grade descaling solutions and equipment to clean more thoroughly than DIY kits. - Inspection for Wear & Tear
Regular service appointments catch issues before they become expensive problems. - System Updates & Calibration
Technicians check for firmware updates, fine-tune settings, and ensure your system is running efficiently. - Peace of Mind
You’ll have confidence knowing your investment is protected by experienced hands.
Bundle with Heat Pump Installation for Full-Home Efficiency
If you're already considering upgrades for your home’s HVAC or plumbing systems, combining tankless water heater service with heat pump installation is a smart move. Heat pumps handle your heating and cooling needs efficiently, while a tankless water heater ensures your hot water is always ready without wasting energy.
Together, these systems create a whole-home solution that’s:
- Energy efficient
- Low maintenance
- Environmentally friendly
- Perfect for modern living
At Motivated Mechanical Solutions, our team can assess your home’s energy systems and design a custom installation plan that includes both a high-performance tankless water heater and a heat pump system suited to your space and climate.
Don’t Skip the Cleaning
To recap:
How often should tankless water heaters be cleaned?
At least once a year more often if you have hard water or a large household.
Regular cleaning improves performance, extends lifespan, and helps avoid costly repairs. When paired with proper installation and expert service, your tankless system will run smoothly for many years to come.
Ready to Schedule a Cleaning or Install a New System?
Whether you need to service your tankless water heater or are exploring whole-home efficiency upgrades like heat pump installation, we’re here to help.
Visit Motivated Mechanical Solutions to learn more about our installation and maintenance services.
Book your appointment today and keep your hot water flowing efficiently all year long.