Is the wire used by residents of Nanjing New Village in Zhi Min 4 mm? Can I use a 3500W instant water heater?

You can use 3.5KW, but you need copper core wire, like Delton electromagnetic water heater, that is, hot type. If it is a 4-square line, choose more, including 3.5KW, 5KW and 7KW. Moreover, the advantage of electromagnetic water heater is that it does not need anti-electricity wall and grounding wire, and does not produce scale. It belongs to small molecular water with magnetic energy activity and is healthier.