Loud banging or hammering noise in pipes when hot water is used.

Safety: No internal heater work is required, but always be cautious around hot pipes.

• Check pressure: Use a pressure gauge on a nearby faucet to measure static water pressure. If above 80 psi, install or adjust a pressure-reducing valve.
• Expansion tank: If the Alpha heater is on a closed system, ensure a properly sized thermal expansion tank is installed and charged to match house pressure.
• Hammer arrestors: Install water hammer arrestors near quick-closing valves (dishwasher, washing machine).
• Secure piping: Clamp loose pipes to framing to reduce movement.

If noise persists, consult a plumber to evaluate the plumbing system design.