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A-class energy efficiency, hygienic hot water, solar thermal, buffer, hydraulic separator, thermal stratification, electric heater back up. The reservoir is made of a unique combination of thermal resistant plastic and fiberglass composite material which is not possible to rust, with an outstanding 30 years warranty. Heat exchangers made of corrugated stainless steel pipe made of "Inox 316L" suitable for hygienic water, 10 years warranty.