Heater

The heater comprises a heating inner pipe, an outer pipe, a first pipe connector, a second pipe connector and a grounding piece, the first pipe connector and the second pipe connector are arranged at the two ends of the outer pipe respectively, and sealing gaskets are arranged between the first pipe connector and the outer pipe and between the second pipe connector and the outer pipe respectively. The heating inner pipe is arranged in the outer pipe, and the heating inner pipe, the outer pipe, the first pipe joint and the second pipe joint can be encircled to form a heating chamber; the grounding piece penetrates through the sealing gasket, and the part, extending out of the sealing gasket, of the grounding piece is in contact fit with the heating inner pipe so that the grounding piece can be electrically connected with the heating inner pipe. When the heater works, once electric leakage occurs, electricity can be directly transmitted to the grounding piece through the heating inner pipe and is grounded, so t