Tankless water heaters are an efficient and reliable way to provide hot water for your home. However, like all appliances, they require regular maintenance to ensure they continue to function properly. In this guide, we’ll explore the importance of tankless water heater maintenance, how to perform maintenance tasks, and when to call a professional plumber for help.

Importance of Tankless Water Heater Maintenance

Tankless water heaters are known for their longevity and efficiency, but they can still develop issues over time if not properly maintained. Regular maintenance helps to:

  • Maintain Efficiency: Over time, mineral deposits can build up inside the unit, reducing its efficiency. Flushing the system regularly can help prevent this buildup and keep your water heater running efficiently.
  • Extend Lifespan: Regular maintenance can help extend the lifespan of your tankless water heater by preventing major issues from developing.
  • Ensure Safety: Checking for gas leaks and other safety hazards during maintenance helps ensure your tankless water heater is operating safely.

How to Maintain a Tankless Water Heater

1. Regular Flushing

  • Turn off the power and water supply to the unit.
  • Connect a pump and hoses to the service valves and a bucket of vinegar.
  • Open the service valves and run the vinegar through the unit for about 45 minutes.
  • Rinse the unit with clean water to remove any remaining vinegar.

2. Check and Clean the Filter

  • Turn off the power and water supply to the unit.
  • Remove the filter and rinse it with clean water.
  • If the filter is heavily clogged, replace it with a new one.

3. Inspect for Leaks

  • Check all connections and fittings for signs of leaks.
  • Tighten any loose connections.
  • If you find a leak, turn off the water supply to the unit and call a professional plumber for repairs.

4. Check the Venting System

  • Ensure the venting system is free of obstructions.
  • Check for signs of corrosion or damage.
  • If you notice any issues, call a professional plumber for repairs.

5. Check the Pressure Relief Valve

  • Test the pressure relief valve by lifting the lever and allowing water to flow out.
  • If the valve does not operate correctly, call a professional plumber for repairs or replacement.

When to Call a Professional Plumber

While some maintenance tasks can be performed by homeowners, there are certain issues that require the expertise of a professional plumber. Call a plumber if you notice:

  • Persistent leaks
  • Fluctuations in water temperature
  • Strange noises coming from the unit
  • Error codes on the unit’s display


Regular maintenance is key to keeping your tankless water heater running smoothly and efficiently. By following these maintenance tips and knowing when to call a professional plumber, you can ensure your tankless water heater provides hot water reliably for years to come..


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