Frank Kemper, deeply convinced European
Answered 4 years ago · Author has 6.5K answers and 21M answer views
They are part of a system called “Fernwärme”, which you could translate into “heating over large distances”. A power plant produces large amounts of hot water and distributes them to houses for heating purposes. It is used to supply large appartement buildings in big cities. The main advantage is that one powerplant can replace thousands of ovens, this reduces the danger of fires. Besides this the one powerplant may be cheaper to run. “Fernwärme” is distributed in many big German cities. However, in cities of West Germany the big pipes usually are buried under the surface. Berlin Mitte was part of East Berlin until 1990. In East Germany many “Fernwärme” Networks were built with tubes above the surface, because that was easier, cheaper and faster to build.