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The Upgrade DH project supports the upgrading and retrofitting process of DH systems in different climate regions of Europe, covering various countries: Bosnia-Herzegovina, Denmark, Croatia, Germany, Italy, Lithuania, Poland, and The Netherlands. The objective of the project is to initiate the upgrading process of concrete DH systems in each of the target countries, the so-called Upgrade DH demonstration cases (demo cases). The gained knowledge and experiences are further replicated to other European countries and DH systems (replication cases) in order to leverage the impact. Core activities of the Upgrade DH project include the collection of the best upgrading measures and tools, the support of the upgrading process for selected district heating networks, the organisation of capacity building measures about DH upgrading, financing and business models, as well as the development of national and regional action plans. In addition, an image raising campaign for modern DH networks is carried out in the Upgrade DH project. The outcome is the initiation of district heating upgrading process in the above-mentioned target countries and beyond. The present paper summarizes the results of the project, which is close to its finalization.

The Upgrade DH project supports the upgrading and retrofitting process of DH systems in different climate regions of Europe, covering various countries: Bosnia-Herzegovina, Denmark, Croatia, Germany, Italy, Lithuania, Poland, and The Netherlands. The objective of the project is to initiate the upgrading process of concrete DH systems in each of the target countries, the so-called Upgrade DH demonstration cases (demo cases). The gained knowledge and experiences will be further replicated to other European countries and DH systems (replication cases) in order to leverage the impact. Core activities of the Upgrade DH project include the collection of the best upgrading measures and tools, the support of the upgrading process for selected district heating networks, the organisation of capacity building measures about DH upgrading, financing and business models, as well as the development of national and regional action plans. In addition, an image raising campaign for modern DH networks is carried out in the Upgrade DH project. The outcome is the initiation of district heating upgrading process in the above-mentioned target countries and beyond. The present paper summarizes the results of the pre-feasibility studies of the demo cases.