Constant pressure is basically 220~230V v v.
The current is 5~9A.
If the current is large, the plug must have resistance, so the heat generation will be relatively large.
The solution can be to change a better plug-in or a smaller electric kettle. The plug is very hot because of poor contact caused by long-term ignition and dirt, which can be solved by replacing the plug with a new one or grinding it with fine sandpaper. The wire is hot because the wire diameter is too thin and the wire resistance is high. Be sure to change the thicker wire and choose a regular manufacturer, otherwise the copper will be impure, the wire resistance will be large and it will be hot.