Water heater vibrates excessively or rattles when heating

Safety first: Turn OFF power before tightening internal components.

Steps:

• 1. Check wall mounting: Ensure the heater is firmly attached to the wall with appropriate anchors.
• 2. Secure piping: Add pipe clamps or supports to prevent pipes from vibrating against walls or the unit.
• 3. Tighten internal parts: With power OFF, open the unit and gently tighten any loose brackets, covers, or components.
• 4. Adjust flow: If vibration occurs only at very high flow, slightly reduce flow at the inlet valve.

Result: Proper mounting and support should minimize vibration and rattling.