!!!Heizung

Heating: Rooms were formerly heated almost exclusively by individual 
heat sources (stoves, fireplaces) using wood, coal and coke; since 
around 1950 also by oil, gas or electricity. Collective heating of 
buildings became known around 1900, mostly in the form of steam 
heating, now mostly hot-water heating. District-heating stations for 
the heating of whole complexes or quarters of a city came into use 
around 1950. The required hot water or steam (industrial-waste steam) 
was generally transported in subterraneous pipelines. Alternative 
forms of energy such as solar energy ( Photovoltaics) or  Geothermal 
Power are becoming increasingly popular.


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