Rheem water heater causes water hammer or banging noises in pipes when heating or shutting off

Safety first: Sudden pipe movement can cause leaks. Inspect exposed piping for damage.

• Check pressure: Measure water pressure; if above 80 psi, install or adjust a pressure-reducing valve.
• Install arrestors: Add water hammer arrestors near quick-closing valves (dishwasher, washing machine) and near the water heater if needed.
• Add expansion tank: On closed systems, install a thermal expansion tank on the cold inlet to absorb expansion.
• Secure piping: Strap and cushion loose pipes to prevent banging.