1 Department of Buildings and Energy, Technical University of Denmark2 Department of Civil Engineering, Technical University of Denmark
18 different small solar heating systems for domestic hot water supply have been tested in a laboratory test facility for solar heating systems. Both test systems built by our Institute and marketed systems from Denmark and from 4 forein countries have been tested. The investigations showed that the solar tank is the most important component for the system and that all the tested systems can be strongly improved by redesigning the systems. Recommendations for development work is given based on the investigations.