Tankless systems heat water through internal coils. Over time, minerals in the water (especially hard water) can build up inside the unit. This buildup can reduce efficiency, cause longer heat-up times, and eventually damage the system. Regular maintenance keeps performance high and helps extend the life of the heater.

Most manufacturers recommend annual maintenance, or twice per year in areas with very hard water. Staying consistent helps prevent costly repairs and ensures optimal operation.

A typical tankless maintenance visit usually includes:

• Descaling / flushing the heat exchanger to remove mineral buildup
• Cleaning the inlet water filter
• Inspecting burner and flame performance
• Checking venting and air intake
• Verifying gas pressure and safety controls
• Ensuring sensors and internal components are functioning properly

Most maintenance services take 45–90 minutes, depending on the buildup level and unit type.

 Skipping maintenance can lead to:

• Reduced hot water flow
• Fluctuating water temperatures
• Increased energy use (higher gas or electric bills)
• System error codes and shutdowns
• Shortened system lifespan
  Routine maintenance is far cheaper than replacing parts or the entire unit.

It’s possible, but recommended only for those comfortable with plumbing steps and manufacturer procedures. A professional ensures the job is done correctly and safely, while also inspecting other components that affect system performance.

Yes. Flushing mineral buildup can restore proper water flow and stabilize temperature control, especially if the unit has been running less efficiently.

Common signs include:

• Hot water taking longer to arrive
• Water temperature fluctuating or running lukewarm
• Reduced water flow or pressure
• New or unusual noises from the unit
• The unit displays an error code
  If you notice any of these, it’s time to schedule service.