Two goals in two minutes midway through the first half from midfielders Bastian Schweinsteiger and Mario Gotze, playing in a forward role, quickly put the Germans in control and dashed any faint hopes for the hosts.
Thomas Muller grabbed Germany's third in the 74th minute in a lacklustre second half after the second-bottom home side attempted a brief comeback and even hit the bar.
"The game was essentially decided in the first half and we took some of the pace off afterwards," Low told ZDF German television. "We wanted to win and that is what is important.
"As for the discussion about the striker, I see this as an option. The offensive midfielder has to be dangerous in front of goal and we want to make our game a bit varied."
Germany are trying to break Spain's stranglehold on major trophies with the Spaniards winning Euro 2012 often playing without a designated striker.
"It is an additional option because when we have Miroslav Klose and [Mario] Gomez fit then we need such players."
Low, whose 4-2-3-1 system had led Germany to two straight semi-finals in the past two major tournaments, opted for no forward in his 91st game in charge even before Thursday's injury to striker Gomez.
"Tonight we saw a world-class team in Germany who demonstrated their mastery," Kazakhstan coach Miroslav Beranek told a news conference.
"When you hear grand names like Germany, you are always under pressure and you make mistakes. We paid dearly for our lapses."
