Yes, Savo, this dryer model must be connected to a cold water supply to use the steam feature.
For more details, Turn to pages 29 to 30 of your user manual under "STEP 4 Connect the water hose and Using the short hose as an extension."
Manual
https://downloadcenter.samsung.com/content/UM/202401/20240129152300391/OID55762_IB_DV8900B_SimpleUX_EN_231006.pdf
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Have a great day.
^Camille