Confidence among investors in Germany surged in January, a closely-watched survey showed Tuesday, in a further sign that a growth streak in Europe's powerhouse could have much further to run.

The ZEW institute's monthly index of financial players' economic expectations added 3.0 points to hit 20.4, a much sharper increase than the 0.5 points forecast by analysts.

Meanwhile, investors' view of the outlook for the eurozone jumped 2.9 points to 31.8.

Both results more than made up for a December slip.