Five years ago it seemed possible that solar water and space heating would break through into the mass market. Oil and gas prices were rising quickly and collector manufacturers had invested in larger production lines. But the successes of 2008 have not continued since. According to the latest projections by BDH, the German heating industry association, German plumbers installed 1.2 million square meters of solar collectors in 2012. This is 5 percent less than in 2011 and 40 percent less than in the boom year of 2008.