plumbing - What is causing these water heater pipes to rust

This water heater was replaced by a plumber 4-5 years ago. Within about a year, all the new connections were rusting/corroding. Did the plumber not sufficiently tighten the fittings? Is this perha

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plumbing - Corrosion around hot water heater connection? - Home

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Rust around top water heater connections and around drain. What