Bosh’s two free throws with 6:45 left pulled the Heat out of a 77-77 tie and started a 14-4 run that put the Heat firmly in charge of their 10th straight win against their intrastate rivals.
Nic Vucevic led Orlando with 33 points and 17 rebounds.
Mario Chalmers had 24 points and eight assists for the Heat, who shot 52 per cent overall and made 12 of 26 3-pointers. Rookie Shabazz Napier added 12 points.
Victor Oladipo scored 12 points for the Magic, and rookie Elfrid Payton had nine points and five steals.