The aim of the project is to establish a basis for future development of solar heating systems, both solar domestic hot water systems, SDHW systems, and solar heating systems combined for space heating and domestic hot water supply. The project will be carried out in cooperation between Department of Buildings and Energy and SPF, Solartechnik Prüfung Forschung, Rapperswil, Switzerland. The project consists of three parts: 1. CFD CALCULATIONS FOR COMBI STORES 2. SMART SOLAR TANKS 3. INFORMATION ON HIGH PERFORMANCE SDHW SYSTEMS