A tankless water heater can be repaired, and most internal components—such as electronic control boards, igniters, flame sensors, water flow control valves, and thermistors—are fully modular and replaceable when they fail. However, if the primary stainless steel or copper heat exchanger cracks or develops a severe structural leak due to severe thermal stress or unmaintained hard water corrosion, repair costs often approach the price of a brand-new unit, making a complete system replacement the more practical and cost-effective financial option.
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