Water hammer or banging noise in pipes when heater fills or stops drawing water.

Safety first: Plumbing work should be done with water supply turned off and pressure relieved.

Steps:

• Check pressure: Measure mains pressure. Install a pressure reducing valve if pressure is above recommended levels.
• Install arrestors: Fit water hammer arrestors near quick-closing valves or near the heater.
• Secure pipes: Add or tighten pipe clamps to prevent movement.
• Valve operation: Avoid slamming shut taps; use smooth operation.