Is it normal to have a rattling noise when heating a heater with an electric heating rod? How to deal with it?

Rattling is normal, with the gas stove sitting on a pot of cold water will be the same as the sound, the solution is not to let the heating rod full voltage power supply, so that it is a low temperature slowly heated, the specific method is in the front of the heating rod power supply with an adjustable silicon controlled device, with the ceiling fan infinitely variable speed switch is similar to the dimming lamps are also this principle, you can go to the electronics store to find a look, industrial electric heat gun on the There is this control temperature circuit, you find electronic stores they know. It means that the electric heating rod temperature is lower, it will not ring.