Hot water has a metallic or rusty color when first drawn from taps served by the Buderus water heater.

Safety: Water may be hot; use caution when flushing. Turn off power and gas if working on the heater or tank.

• Identify source: Determine whether discoloration occurs only on hot water or both hot and cold. If only hot, the issue is likely in the heater or hot piping.
• Flush system: Flush the hot water lines and, if applicable, the indirect storage tank until water runs clear.
• Check anode rod: For Buderus indirect tanks, inspect and replace the sacrificial anode rod if heavily consumed.
• Inspect tank interior: If the tank is old and corrosion is severe, replacement may be necessary.
• Pipe replacement: Replace heavily corroded steel piping with suitable materials (e.g., copper, PEX) as needed.