Protecting electric water heaters from scale, involves establishing an electric current of more than ten milliamps through the water in the tank, e.g. between the tank and an insulated element in it

摘要

A method for protecting electric water heaters from scale where the heater comprises a tank (C) sealed with a flange carrying at least one element (3) insulated electrically from the tank (C), involves establishing an electric current with a total intensity of more than 10 mA through the water in the tank. Independent claims are also included for (1) a device for protecting water heaters as described above from scale, comprising means (21) of establishing an electric current of more than 10 mA through the water in the tank (2) electric water heaters fitted with an anti-scale device as above .