Can the hotel use an electric soldering iron?

You can't. According to the "China Electric Power Safety Law", all electrical equipment in the hotel should be installed in accordance with the relevant national electric power technical regulations, and electric appliances such as electric stoves and soldering irons are not allowed in hotel rooms and other public places. Hotel electricity consumption regulations: the hotel strictly abides by various fire laws, regulations and rules. The installation and maintenance of electrical equipment and lines must comply with the electrician's operating rules and electrical installation and maintenance specifications, and overload work is strictly prohibited.