The National Technical University of Athens (NTUA) is a RTD performer and the project coordinator. NTUA will contribute to the different stages of the project, as defined in the work programme, emphasizing on the integrated concept development and on the retrofitting and testing of existing heat pump units, incorporating the developed expander. NTUA has a wide experience and is active for over 30 years in the field of energy efficiency and savings from thermal plants, heat pump units, heat/mass transfer phenomena, process simulation/optimization, the development of advanced cycles for power generation, such as the ORC, etc. Currently, NTUA is a certified body for energy efficiency, environmental measurements and the provision of the sign “CE” for oil and natural gas boilers. The aim in the near future is to become a notified body in air-water heat pumps and biomass boilers as well.