Flate plate collectors
When domestic hot water is needed (hotels, hospitals, private houses)
EN 12975-1, ISO 9806, EN 12976, EN 12977
International certification of panels for energy saving (test by certified bodies with EN norms)
Install solar water heaters . Replace fuel or electricity ; Energy saving : 800 kWh /m2/year. Evacuated tube collectors offer temperatures of hot water appreciably higher than flat plate collectors, which have however a better global efficiency.