Actually it's 212*F or 100*C, at sea level.

Bob,
For removal; heating the point the way you describe is the way I do it but I'm careful to keep my fingers on the carbon over the insert, if I feel it getting hot I dip it in a handy glass of room temp. water. Warm is okay but if it starts to get uncomfortably warm/hot it gets dunked/cooled. Also, since heat rises, it's wise to hold the shaft tip up while doing this. Never done it with boiling water but I like that idea, I may try it next time.

For inserting; only the glue gets heated and the aluminum insert gets warmed. Never apply direct heat to carbon, and I have a glass of water standing by. As soon as the insert is in, the shaft gets dunked. It's also important not to go overboard with the amount of hot glue.