“Rust” and “water heater” aren’t words you want to see together. In general, you don’t want rust or other forms of corrosion to appear on any metal, since it weakens it. Metal in contact with water is in danger of corrosion, provided it’s also exposed to oxygen. Because rust cannot be reversed, only removed, once it starts, conventional wisdom about rust and water heaters is that once there’s corrosion starting, a water heater is finished. Time for a new one.
Is this always the case? If you see rust on your water heater, does it mean it’s time to call us to replace it? Let’s take a closer look at corrosion and water heaters.