Oh, those Siemens dryers get pretty hot. The thermostat cuts off when the temp reaches 70 to 75C on a normal cycle before it reaches Iron Dry, at which point the max. temp is reduced by 10C
The reason you don't feel much hot air coming from it is because it releases it through mainly the back panel and every other nook and cranny there is. Remove the water tank and you can feel quite a bit of hot air blowing out of the opening.
Alex