Determining whether it is cheaper to repair or replace a water heater depends primarily on the age of the unit and the nature of the mechanical failure. If the water heater is less than six years old and suffers from a minor, easily replaceable part failure—such as a faulty thermostat, heating element, or thermocouple—repairing is usually the most cost-effective option. However, if the unit is over ten years old or has developed a leak in the inner steel pressure tank, repairs are impossible, making immediate replacement mandatory to avoid catastrophic flooding and water damage.
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