Does the hepatitis b vaccine ever require booster?

Hepatitis b vaccine . No booster doses are routinely recommended at this time.
Hard to speculate. The current lab produced Hep B vaccines have only been in wide general use since the mid 1990's & producers are continuously bringing out newer versions that they hope will be better. The earlier versions have no recommended boosters after completing the primary series, but as vaccines go it takes time to see if it would ever be needed.
Occasional. Antibodies levels may decrease with time but there is argument wether a booster is needed. Thy being said it is common to give.