In most cases, a network comprises a main heat production unit, which operates continuously, and a back-up unit used as a backup during peak periods, or as a replacement during maintenance or breakdowns. Heat can be generated from a number of energy sources - an "energy mix".
The various energy sources can be of the :
renewable: biomass combustion (wood, agricultural residues, crops, etc.), geothermal heat recovery from deep aquifers (figure 2);
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You can easily identify them thanks to this pictogram:
Primary distribution network
