Tankless Water HeaterMaintenance2025-09-30
Tankless Water Heater Maintenance Guide
Annual descaling and filter cleaning keep a tankless unit efficient and long-lasting.
Tankless water heaters need a little annual care to deliver their 20-year lifespan and consistent performance.
Annual tasks
Descale (flush) the heat exchanger, clean the cold-water inlet filter, check venting and combustion, and inspect for leaks and error history.
Hard-water care
In hard-water areas, more frequent descaling or a water softener protects the heat exchanger and maintains flow and efficiency.
Key takeaways
- Descale annually (more in hard water)
- Clean the inlet filter
- Install isolation valves for easy service
- Check venting and combustion yearly
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