The ThyssenKrupp Flow 2, introduced in 2005, brought German engineering excellence to the curved stairlift market. ThyssenKrupp, already renowned for elevators and escalators, applied their expertise to the domestic accessibility sector.

The Flow 2's most notable innovation was its twin-tube rail system. Instead of a single curved track, it used two parallel tubes that provided exceptional stability and allowed for tighter curves. The carriage "wrapped around" the rails, preventing any possibility of derailment.

German manufacturing precision meant each component was machined to exacting tolerances. The result was an exceptionally quiet, smooth ride — users often described it as "floating" up the stairs.