Water heater causes noticeable vibration in nearby pipework and structure during operation.

Safety first: Be cautious when adjusting valves on hot water lines; surfaces may be hot.

• Step 1 – Secure pipework:
  • Inspect visible pipes around the Nibe cylinder and secure any loose sections with proper clamps and supports.
• Step 2 – Adjust pump speed:
  • If the circulation pump has adjustable speed, try reducing the speed setting to minimize vibration.
• Step 3 – Bleed air:
  • Bleed radiators and high points to remove trapped air that can cause hammering.
• Step 4 – Check outlet valves:
  • Replace or adjust any fast-closing taps or solenoid valves that may be causing water hammer when closing.

If vibration remains severe, a plumber may need to install water hammer arrestors or adjust system design.