Attention please: The heating coil of the heating tube must be completely immersed in water before it can be powered on. Dehydration and dry burning are strictly prohibited and dry burning suggests that section or all of the heating detail is exposed to the water floor and is energized when exposed to the air. Since the warmth can't be performed out through the water, all of it's absorbed during the water inlet pipe, that will trigger the metal pipe physique to turn black and bulge or burn the pipe, burn and break, and burn and melt.