Tankless Water Heater Descaling: Why and How Often
Why Descaling Matters
Tankless water heaters run water through a compact heat exchanger, which is more susceptible to efficiency loss from mineral scale buildup than a large storage tank.
Left unaddressed, scale buildup can reduce flow rate, cause error codes, and eventually damage the heat exchanger, leading to a costly repair.
Recommended Descaling Frequency
In hard water areas, annual descaling is commonly recommended. In areas with naturally soft water, every 2-3 years may be sufficient.
A whole-home water softener can also reduce how often descaling is needed, though it does not eliminate the need entirely.
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Frequently Asked Questions
What happens if I never descale my tankless unit?
Reduced flow rate, more frequent error codes, and eventually reduced heat exchanger lifespan are common outcomes of skipping descaling in a hard water area.
Can descaling be done as a DIY project?
Some manufacturers sell DIY descaling kits, but a professional service ensures thorough flushing and can catch other developing issues at the same time.
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