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The sun supplies free regenerative energy which is converted into heat and is ideally suitable for heating and hot water. Under certain conditions, the best solution is to generate the additional heat required with electric power. For example, if other energy sources are not available or can only be used uneconomically. This was the kind of situation for which the ROTEX E-SolarUnit was developed. The particular feature is that the associated hot water and solar storage tank is operated completely independently of the heating network, and solar heat is nevertheless used for heating support.