Can the piano be plugged with electric heating tube all the time on resurgence day?

It is best not to use it, because the working principle of this kind of electric heating tube is to generate heat energy to bake the soundboard. This thing is afraid that you forget to unplug the power supply. The soundboard is always baked, and it is easy to crack the soundboard and the piano will be scrapped. So it is not recommended that you use it.

In addition, a really good piano is not afraid of humidity. For example, Steinmeier's piano in Germany, its soundboard has gone through five to ten years of natural drying before being used as a piano soundboard. Its soundboard contains much less water and will not be affected by moisture because of the weather, so you don't have to worry about being affected by moisture when you buy this piano.