How to fill the water tank.

1. Confirm that the iron is unplugged.
2. Set the Steam/Dry selector to the Dry position to avoid water leakage.
   
   Image varies by model
3. Open the Water Fill Cover, hold the iron as shown and fill the iron with water up to the [ MAX ] dot or line.
   Use a water cup for filling.
   •  For models NI-W950, NI-U600 use the included water cup.
   • For Models NI-QL1000, NI-WL607, NI-WL607AP, NI-WL600, NI-WL602 the iron can be filled with the Water tank in place or removed. To remove the water tank press the [Water Tank Release] 
     
     

     Image varies by model

4. Do not overfill. Check for the correct water fill level with the iron on its Heel Rest.
5. Close the Water Fill Cover, or water will splash from the Water Tank when ironing.
   • For models NI-QL1000, NI-WL607, NI-WL607AP, NI-WL600, NI-WL602 Re-install the Water Tank into the main unit if it was removed and push it until a click sound is heard.

Note :

• Most tap water can be used in this iron. 
• If the water is hard, distilled or demineralized water should be used.
• Do not use water processed through a home water softening system because this water contains minerals that may be harmful to the iron.
• Do not use water additives or substitute water such as linen or scented water in the steam iron.  They can stain fabrics or damage the iron.

This answer applies to models NI-E250SR, NI-E300T, NI-E650TR, NIE655TR, NI-E660SR, NI-E665S / SV, NI-M300T, NI-P300T, NI-QL1000, NI-U600, NI-W450, NI-W750T, NI-W810CS,NI-W950, NI-WL600, NI-WL602, NI-WL607.