Solar water heaters have no lightning protection device. Under normal circumstances, users need to install their own variable wires, which can be combined with the lightning protection device of buildings and connected to a line to play a lightning protection role. Some controllers of solar water heaters contain lightning protection devices, which can prevent lightning strikes. Compared with electric water heaters, solar water heaters are definitely cost-effective. Tsinghua Sunshine's solar King Kong series was put on the market after three years' trial in Daqing, Heilongjiang. You can get to know it. In addition, if you don't know anything about this, you can give me the information and answer it in detail.