Research on solar combisystems for the Nordic and Baltic countries have been carried out. The aim was to develop competitive solar combisystems which are attractive to buyers and to educate experts in the solar heating field. The participants of the projects were the universities: Technical University of Denmark, Dalarna University, University of Oslo, Riga Technical University and Lund Institute of Technology, as well as the companies: Metro Therm A/S (Denmark), Velux A/S (Denmark), Solentek AB (Sweden), SolarNor (Norway) and SIA Grandeg (Latvia). The project included education, research, development and demonstration. The activities started in 2003 and were finished by the end of 2006. A number of Ph.D. studies in Denmark, Sweden and Latvia, and a post-doc. study in Norway were carried out. Close cooperation between the researchers and the industry partners ensured that the results of the projects can be utilized. The industry partners will soon be able to bring the developed systems into the market. In Denmark and Norway the research and development focused on solar heating/natural gas systems, and in Sweden and Latvia the focus was on solar heating/pellet systems. Additionally, Lund Institute of Technology and University of Oslo studied solar collectors of various types being integrated into the building.