A tankless water heater offers endless hot water supply, making it a popular choice for Michigan homeowners and businesses looking for efficiency and convenience. However, like any piece of equipment, a tankless water heater requires regular maintenance to perform its best.
With proper upkeep, you can ensure your tankless water heater operates smoothly, reduces energy costs, and provides reliable hot water on demand.
At Moore Mechanical, we’re here to help you make the most of your tankless water heater. This guide covers essential maintenance tasks, seasonal care tips, troubleshooting advice, and when to call a professional.
For more information on tankless water heaters and their benefits, check out our Complete Tankless Water Heater Guide.
Why Regular Maintenance Matters for Your Tankless Water Heater
Tankless water heaters heat water only when needed, which makes them highly energy-efficient. However, because they work on-demand, they can accumulate mineral deposits and other buildup, particularly in areas with hard water.
Regular maintenance helps prevent scaling, keeps your heater efficient, and ensures reliable access to hot water when you need it most.
Key Maintenance Tasks for Your Tankless Water Heater
1. Descale the System
- How Often: Every 6-12 months, depending on water hardness
- Why It Matters: Mineral deposits from hard water can build up inside the heat exchanger, reducing efficiency and potentially leading to overheating or damage.
- How to Do It: Use a descaling solution, such as white vinegar, to flush the system. Turn off the power and water supply to the unit, connect hoses to the service valves, and circulate the descaling solution through the heater for 45 minutes to an hour. After flushing, rinse the system with clean water. Regular descaling prevents buildup and helps maintain consistent water temperature.
2. Clean the Water Filter
- How Often: Every 6-12 months, or more frequently in hard water areas
- Why It Matters: The water filter traps sediment and prevents debris from entering the system, protecting the heat exchanger and internal components.
- How to Do It: Locate the filter (usually at the cold water inlet) and remove it carefully. Rinse it under running water to remove sediment, then reinstall it. Keeping the filter clean improves water flow and prevents clogs.
3. Inspect the Venting System
- How Often: Annually
- Why It Matters: Proper venting is essential for removing exhaust gases and ensuring safe operation. Blockages or damage to the venting system can lead to carbon monoxide buildup and other safety risks.
- How to Do It: Check the venting pipes for any cracks, loose connections, or blockages. Ensure all venting is properly secured and free from obstructions. If you detect any issues, contact a professional to make repairs.
4. Check the Temperature Settings
- How Often: Seasonally, or as needed
- Why It Matters: Setting the water temperature too high can waste energy and increase wear on the system, while too low a setting may lead to insufficient hot water.
- How to Do It: Check the thermostat on your unit and set it to an ideal range, typically around 120°F. This temperature balances efficiency with safety, providing comfortable hot water while preventing accidental scalding.
Seasonal Maintenance Tips for Tankless Water Heaters
Preparing for Winter
- Insulate Pipes in Unheated Areas: If your tankless water heater is installed in a garage, basement, or other unheated space, insulate the pipes leading to and from the unit to prevent freezing.
- Check the Freeze Protection Settings: Many tankless water heaters have built-in freeze protection. Make sure this feature is activated, especially in Michigan’s colder months.
Preparing for Summer
- Increase Descaling Frequency if Needed: With higher water usage in summer, descaling may be needed more frequently to prevent buildup.
- Clear Debris Around Outdoor Units: If your unit is installed outdoors, make sure there’s clear airflow around it, and remove any debris that could block ventilation.
Common Issues and Troubleshooting Tips
Issue: Water Temperature Fluctuations
- Possible Causes: Mineral buildup, incorrect temperature settings, or low water pressure.
- Solution: Descale the system and check temperature settings. If temperature issues persist, contact a technician to assess for low water pressure or a malfunctioning sensor.
Issue: Reduced Water Flow
- Possible Causes: Clogged filter, mineral buildup, or restricted water supply.
- Solution: Clean the water filter and descale the system. If water flow remains low, check for leaks or blockages in the plumbing.
Issue: System Shutting Off Unexpectedly
- Possible Causes: Overheating, venting issues, or sensor problems.
- Solution: Descale the system to prevent overheating, inspect the venting for blockages, and check the thermostat settings. Persistent shutdowns may require a professional diagnosis to ensure that all sensors and components are functioning correctly.
When to Call a Professional
While many tankless water heater maintenance tasks are manageable for homeowners, some tasks—such as in-depth descaling, repairs, and sensor adjustments—are best handled by a professional. A licensed technician can perform a comprehensive inspection, verify system settings, and check for potential issues. Scheduling an annual maintenance check is recommended to keep your tankless water heater in peak condition.
Keeping Your Tankless Water Heater Running Smoothly Year-Round
With proper care, your tankless water heater will deliver reliable hot water on demand, helping save energy costs and reduce repairs. By following these maintenance tips, you’ll enjoy consistent hot water, fewer disruptions, and a longer system lifespan. For more details on tankless water heaters, including how they work and their benefits, visit our Complete Tankless Water Heater Guide.
