Stock Photo - 10 January 2023, Hessen, Frankfurt/Main: The chimney of a gas boiler for heating and hot water steams in the early morning on the flat roof of Frankfurt row houses, where solar panels are also installed. Photo: Frank Rumpenhorst/dpa. - Frankfurt/Main/Hessen/Germany

Stock Photo: 10 January 2023, Hessen, Frankfurt/Main: The chimney of a gas boiler for heating and hot water steams in the early morning on the flat roof of Frankfurt row.

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