What Maintenance is Required for a Tankless Water Heater?

May 18, 2026

Proper maintenance is essential for ensuring a tankless water heater reaches its expected 20-year lifespan and maintains peak efficiency. Because hard water minerals can build up quickly in these systems, regular upkeep is required to prevent error codes, reduced flow, or system failure.

The most critical maintenance task is annual professional flushing. This involves descaling the unit with a vinegar solution or commercial descaler for 45 to 60 minutes to dissolve limescale and sediment. In areas with particularly hard water, this may need to be done more frequently than every 12 months.

Additional routine maintenance includes:

  • Quarterly filter cleaning: Inspecting and removing debris from water and air intake filters to ensure optimal air quality and performance.
  • Monthly visual checks: Monitoring the display for error codes, checking for leaks, and ensuring external vents are clear of obstructions like leaves or nests.
  • Professional inspections: Having a certified technician perform heat exchanger inspections, flow rate testing, and safety checks to validate warranties and boost energy efficiency by 20-30%.

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