The electric heating heats the water that then circulates through the heating system. The electric heating is a complete functional unit, consisting of an electric heater with three stainless steel heater coils, a constantly quiet, high efficiency circulation pump, a safety temperature limiter and an electronic constant temperature control with additional functions. All components which come into contact with media are corrosion resistant. Options with a diaphragm pressure compensating tank as well as heating a circuit manifold are also available. The electric heating may be also mobile for emergency heating. A large control programme is provided for supplementary control of the stations.