When boiling water, I hear a loud "roaring" sound from inside. Is this normal? Yes, it is caused by bubbles forming and water volume changes, not a product malfunction; it is safe to use. Related articles Does MoonKettle become hot when the water is boiled? How does the power turn off? Does MoonKettle have a safety function? Why is there water leakage from MoonKettle? Why is MoonKettle not stable on power supply base unit?
