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Close-up view of a tankless water heater's corroded heat exchanger, revealing extensive mineral scale buildup. This critical damage is a primary cause of attic leaks and water damage, directly illustrating the issues detailed in our article on tankless heater scale.

Tankless Water Heater Scale: The Hidden Cause of Attic Leaks

Feb 17, 2026

Tankless heater leaking in the attic? Scale buildup causes heat exchanger failure. Learn why ‘descaling’ is mandatory for warranty and safety.