Solar Keymark: Additional Table Allows Comparison of Annual Collector Output

The Solar Keymark certification is getting more consumer-friendly: Since the beginning of this year, the new certificate data sheets include a second page on the annual collector unit output for different solar radiation sites in Europe (Stockholm, Davos, Würzburg and Athens). The list shows the output at average collector temperatures of 25, 50 and 75 °C. For example: The new optimised Aqua Plasma collector 19/17 by German collector producer Ritter achieves 1,106 kWh per collector unit and year in Würzburg (50 °C). The gas-filled flat plate collector PS1-52 Joule by Austrian company Geo-Tec achieves 793 kWh at the same location. Both collectors were launched this year with a gross collector area of 1.69 m² and were presented at the Intersolar Europe in June. The listed output should now give end consumers a good hint at what they get for their money.