Heatrae Sadia water heater vibrates or hums loudly when heating.

Safety first: Isolate power and, if necessary, water before tightening fixings or opening the unit.

Steps to reduce vibration:

• 1. Check mounting: Ensure the heater is securely fixed to a solid wall using appropriate fixings. Tighten loose screws or bolts.
• 2. Support pipework: Add or adjust pipe clips to prevent pipework from transmitting vibration into walls.
• 3. Reduce flow rate: Slightly reduce flow through the heater if cavitation noise occurs at very high flow.
• 4. Internal check: With power off, inspect for loose covers, baffles, or components inside the casing and secure them.