The market for solar heating installations in Sweden grew rapidly until around 2006. After that, the overall market started to decline. This can be explained by low energy prices but also by competition from solar electricity (PV). In many respects the two markets are competing for the same customers. Most companies that currently sell solar heating systems also sell solar electricity systems. The two segments can be characterized as follows:
Solar electricity: Great demand, non-existent margins
Solar heating: Very low demand, large margins in the installation stage
Recent years the price of flat plate collectors has dropped while the price of vacuum tube collectors seems to have risen somewhat. One explanation for this may be that most of the less established companies engaged in "garage imports" from China have now disappeared, while those companies working with high-quality vacuum tubes are left. The price decrease of flat plate collectors is mainly explained by the price developments in Europe.
During 2014, the marked for solar thermal collectors dropped rapidly. The selling of vaccum tube collectors dropped with 34 % and of flat plate collectors with 18%.
(Source: Solar heating statistics, report to the Swedish Energy Agency (in Swedish), Peter Kovacs, SP Technical Research Institute of Sweden, 2014-12-11)