With more than twenty-five years of experience in Spain, at the moment, low temperature solar thermal energy has reached its technological and commercial maturity, but the market is still weak.

Global solar radiation on horizontal surface in Spain oscillates between 3,2 KWh/m2/day in the northern zone and 5,3 KWh/m2/day in Canary Islands. So, Spain is particularly privileged in comparison to the other countries in Europe. However, only few regions have a strong market on solar thermal systems, the other still have a long way to reach them.

The most generalised solar thermal systems application is the domestic hot water production (DHW) in unifamiliar housing, hotels, hospitals, camping, sports pavilions, etc... Specific installations to heat swimming pools are still not very spreaded out despite its high potential.