The district heating systems or centralised heating networks
The central heating networks allows the supply of thermal energy to a large number of buildings from one or several heat production sites.
The distribution is carried out by an underground insulated pipes that transport the thermal liquid (hot water) to the buildings. Accordingly, each user may individually use the desired thermal service.
In the majority of cases, these systems are managed by means of energy sales mechanisms. An energy services company exists which manages the installation and charges users in accordance with their energy consumption, resulting in a reduction of the energy bill.
Directive 2009/28/EC in relation to the promotion of the use of renewable energy sources encourages the use of the above installations and considers that it is necessary to establish mechanisms in order to promote urban heating and cooling systems based upon renewable energy sources by Member States.