Water heater makes popping or rumbling noises during heating cycles.

Safety: Turn OFF power or gas and allow water to cool. Close the cold water supply.

• Flush tank: Connect a garden hose to the Alpha drain valve and drain several gallons. Open the cold supply briefly to stir sediment, then drain again until water runs clear.
• Inspect elements (electric): Remove and inspect heating elements for heavy scale. Replace with low-watt-density Alpha elements if necessary.
• Lower temperature: Reduce the thermostat setting to minimize scale formation.
• Consider treatment: Install a water softener or scale reduction system if in a hard water area.

Severe sediment may require professional cleaning or tank replacement.