You can use css:
style="margin-left: 5px;"
Putting the HTML number directly did the trick for me:
 
I found that the parser would complain if I used the entity in my page. After a little research, I learned that if I added a DOCTYPE declaration to the beginning of the page, the entity was allowed. I use this DOCTYPE declaration:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
A side effect of this is that the resulting code (as seen by using the "view source" feature of a web browser) doesn't actually contain the entity. It instead includes the actual characters that represent a nonbreaking space. Although it works, it's not really what I want. I'm still looking for a way to make the parser not replace the entity with the character.
More information here: http://java.net/jira/browse/JAVASERVERFACES-1576
Not necessary to give 160 . 141 will also work. For the value field provide value="" .
Eventually, you can try this one, if just using fails...
<h:outputText value="& nbsp;" escape="false"/>
(like Tom, I added a space between & and nbsp; )
just to add to options: <h:outputText value="&nbsp;" escape="false"/> worked
You can also use primefaces <p:spacer width="10" height="10" />
The easiest way is:
<h:outputText value=" " />
You can use primefaces library
<p:spacer width="10" />
If your using the RichFaces library you can also use the tag rich:spacer which will add an "invisible" image with a given length and height. Usually much easier and prettier than to add tons of nbsp;.
Where you want your space to show you simply add:
<rich:spacer height="1" width="2" />
Source: Stackoverflow.com