Electric water flow heater

摘要

Electrical heater for a flow of water through it has a non-insularted heat conductor in a channel for the water. The channel is pref. of polypropylene, and is jacketed with a metal pipe. Pref. the ends of the conductor are at a distance from the ends of the channel such that in the unheated stretch of channel the amount of water forms a sufficient safety resistance for the electrical voltage on the conductor.