In addition, the modules in the Vitovolt 300 series are also available in a pure black design. Now the good news: Viessmann is extending the product warranty from twelve to 15 years, while the output warranty remains at 25 years. For homeowners who are still reluctant to invest in their own solar energy system, Viessmann also offers an all-round, worry-free package. The monthly system rental already includes maintenance and any necessary repairs. (mfo)
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