Question about Kärcher Se4002

The main difference on the unit is that on the 4002 the spray water hose is combined in the suction hose incl. all pipes (it is ONE hose). The pipe sections all have a water connection and can be combined (omitted) as desired. On the 4001, the water hose is attached via clips and is probably a fiddly job. If you look closely at all the pictures, you will see the difference with the hose guide (some of the pictures are currently incorrectly assigned to the models). The 4001 also does not have the small upholstery nozzle.

The small upholstery nozzle is very helpful for cleaning upholstery. The large nozzle is too unwieldy for this.
Don't forget that you always have to hold the nozzle at a certain angle, otherwise the vacuum is insufficient.
It is really recommended to take the version with the built-in spray loop. The version with a clip is extremely cumbersome.