Like with any other system, tankless water heater maintenance is crucial. Tankless hot water systems have gained immense popularity for their energy efficiency, longevity, and ability to provide an endless supply of hot water. However, like any home appliance, they require regular maintenance to function optimally and extend their lifespan.
In this guide, we walk you through essential maintenance tips to keep your tankless water heater in top condition.
Why Tankless Water Heater Maintenance Matters
Unlike traditional water heaters that store hot water, tankless units heat water on demand, which reduces energy consumption and prevents standby heat loss. However, they are susceptible to mineral buildup, corrosion, and component wear over time. Routine maintenance ensures:
- Optimal performance: Prevents issues that can reduce efficiency and water flow.
- Longevity: A well-maintained unit can last over 20 years.
- Cost savings: Maintenance helps reduce the risk of expensive water heater repairs and ensures lower energy bills.
- Consistent water quality: Prevents scale and sediment buildup that can affect water taste and pressure.
Top 9 Essential Tankless Water Heater Maintenance Tips:
1. Flush the System Regularly
Mineral and scale buildup is one of the primary concerns with tankless water heaters, especially in areas with hard water. To prevent efficiency loss and damage, flushing the system at least once a year is recommended.
How to Flush a Tankless Water Heater:
- Turn off the power and gas supply.
- Close the water inlet and outlet valves.
- Connect a submersible pump and hose to the service valves.
- Use a descaling solution or white vinegar to flush the system.
- Let it circulate for 45–60 minutes.
- Rinse thoroughly with clean water.
- Restore power and gas supply.
2. Clean Your Water Heater’s Inlet Filter
The inlet water filter prevents debris from entering the system. Over time, it can become clogged and reduce water pressure. Cleaning the filter every 6–12 months helps maintain proper water flow.
Steps to Clean the Inlet Filter:
- Turn off the water supply.
- Locate the filter (usually near the cold water inlet valve).
- Remove and rinse it under running water.
- Reinstall and turn the water supply back on.
3. Descale the Heat Exchanger
Hard water minerals can accumulate in the heat exchanger, affecting heating efficiency. If you notice a drop in water temperature or flow, descaling may be necessary.
- Use a descaling solution specifically designed for water heaters.
- Follow the manufacturer’s instructions for proper dilution and cleaning.
- Rinse the system thoroughly after descaling to remove any chemical residue.
4. Inspect Your Water Heater’s Venting System
A tankless water heater requires proper ventilation, which is an essential part of tankless water heater maintenance and ensuring safe operation. Blockages in the venting system can lead to overheating or carbon monoxide buildup.
How to Inspect the Venting System:
- Check for any obstructions or damage in the vent pipes.
- Ensure there are no leaks where exhaust gases could escape.
- Clean the vents if you notice any debris buildup.
- Call a professional for a thorough inspection if needed.
5. Check for Tankless Water Heater Leaks and Corrosion
Although tankless water heaters are designed to be durable, leaks and corrosion can still occur over time.
- Inspect all connections, valves, and pipes for leaks.
- Check the unit for rust or corrosion.
- Address any water heater leaks immediately to prevent the need for repairs.
6. Maintain the Gas Burner or Electric Heating Elements
For gas-powered units, the burner should be free of dust and debris for efficient combustion. For electric units, the heating elements should be inspected for wear.
For Gas Burners:
- Turn off the gas supply.
- Remove the burner cover and clean it using a soft brush or compressed air.
- Reassemble and test the burner function.
For Electric Elements:
- Turn off the power supply.
- Inspect for any visible signs of wear or scaling.
- Ensure the thermostat is working properly
- Replace your water heater and any failing components when necessary.
7. Monitor Tankless Water Heater Error Codes
Most modern tankless water heaters display error codes when an issue arises. Familiarize yourself with these codes by checking the manufacturer’s manual. Common error codes may indicate:
- Clogged filters
- Scale buildup
- Ignition failure
- Venting issues
If an error persists after basic troubleshooting, seek professional assistance.
8. Install a Water Softener if Necessary
If your home has hard water, installing a water softener can significantly reduce mineral buildup and extend the life of your water heater. A water softener prevents excessive scaling, reducing the need for frequent descaling and improving overall performance.
9. Professional Tankless Water Heater Maintenance
While many tankless water heater maintenance tasks can be done yourself, scheduling an annual inspection with a professional plumber ensures your system is thoroughly checked for any hidden issues. A professional can:
- Perform deep cleaning and descaling
- Check the gas pressure and burner function
- Test electrical connections
- Ensure proper venting and combustion safety
Call Houston’s Tankless Water Heater Maintenance Pros
Routine maintenance is essential to keep your tankless water heater running efficiently for years to come. Regular flushing, filter cleaning, descaling, and venting inspections will help prevent costly breakdowns and ensure a steady supply of hot water.
If you’re unsure about any of the previously discussed tankless water heater maintenance tasks, don’t hesitate to seek professional assistance from Mammoth Plumbing at 281-398-1700. With proper care, your tankless water heater can continue to provide energy-efficient and reliable hot water for decades.
