The invention discloses an instantaneous electric
water heater with a non-metallic
pipe inner wall plated with
silicon dioxide heating elements. The instantaneous electric
water heater comprises a shell,
water tanks, electrical heated pipes, a water inlet
pipe, a water outlet
pipe, a
water flow switch, a gear switch and the like; the
water flow switch is of a
water flow pushing type structure and is composed of a water flow switch main body, a cover plate, a sealing piece, a pushing piece, a spring or a
leaf spring, an installation cover plate, a microswitch, stationary contacts, a movable contact, terminals and a pushing pin of the microswitch; a water
inlet channel and a water outlet channel are separated by the cover plate instead of directly communicating with each other; when water flows, a circuit is connected, and when the water does not flow, the circuit is disconnected; the water flow switch and the gear switch need to work in a matched mode; and when water in the
water tanks needs to be preheated, a preheating switch is pressed. Heating is conducted in the mode that the non-metallic pipe inner wall is plated with the
silicon dioxide heating elements, and a
metal heating pipe can be adopted at the same time.