Since the 1996-97 season, Miami has won five division titles, tying the San Antonio Spurs for the most in the NBA in that span. The Heat won ZERO division titles prior to 1996-97:

Most Division Titles By Franchise - Since 1996-97

Miami Heat (’96-’97 to ’99-’00; ’04-’05) 5
San Antonio Spurs (’98-’99; ’00-’01 to ’02-’03; ’04-’05) 5
Los Angeles Lakers (’97-’98; ’99-’00 to ’00-’01; ’03-’04) 4
Utah Jazz (’96-’97 to ’99-’00) 4
4 teams (Detroit, Indiana. New Jersey, Seattle) 3

*** Includes season(s) when tied for division titles.