Tank Water HeaterMaintenance2025-12-12
Water Heater Rumbling or Popping: Sediment
Rumbling and popping noises mean sediment build-up — flushing the tank usually quiets it.
A rumbling or popping water heater is almost always sediment — and it's both a noise and an efficiency problem.
Why it happens
Minerals settle as sediment at the bottom of the tank. As the burner heats through it, trapped water boils and 'pops,' reducing efficiency and overheating the tank base.
The fix
Draining and flushing the tank removes sediment and quiets the noise. In hard-water areas, annual flushing prevents build-up and extends tank life.
Key takeaways
- Rumbling/popping = sediment
- Flush the tank to quiet it and restore efficiency
- Flush annually in hard-water areas
- Heavy sediment shortens tank life
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