Heater emits a metallic or rusty smell from hot water.

Safety: Odor is usually not immediately dangerous but indicates corrosion. If water is discolored, avoid using it for drinking.

Steps:

• Inspect anode: Turn off power, drain partially, and remove the magnesium anode rod (often combined with the flange). If it is less than ~10% of original size, replace it.
• Flush tank: Drain the tank completely and flush with fresh water until clear.
• Check for leaks: Look for signs of tank perforation. If the tank is leaking, replacement is required.
• Water quality: If supply water has high iron, consider installing a pre-filter or water treatment system.