Germany, Baden-Wurttemberg, Waiblingen, Natural gas-operated central heating system
Palabras clave
german,
natural,
central,
heating,
system,
environment,
ecology,
technology,
outdoors,
day,
gas,
resource,
boiler,
modern,
progress,
efficiency,
house,
residential,
building,
energy,
saving,
area,
development,
heat,
nobody,
solar,
panel,
mobile phone,
photovoltaic,
renewable
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