Some other friends asked me why the steamer that I just bought had a reddish surface on the heating tube when I started the test. After a while, it was not red, and it was broken. First, it is a normal phenomenon that the surface of the heating tube is red. The reason for the redness of the surface of the heating tube is that the surface load is designed to be relatively high, and the surface temperature is at least over 400 degrees. When the temperature is climbing, the heating tube is heated rapidly and the power is large. This is a high-load process, so the heating tube will turn red. When the internal temperature reaches the preset temperature, the power will drop and the heating tube temperature will also be Something down, the heating tube is naturally not red.