"I just like to see him get off the floor," Spoelstra said. "He probably had more jumps in this game than he has had in a lot of them. He was active. It felt like he was a 7-foot player, which he is."
Bosh finished with 17 points and a season-high four blocks. Ray Allen scored 20 off the bench and helped Miami pull away in the fourth quarter.
The Heat made their first seven shots to go ahead 15-6. The Wizards made several runs but never managed to pull even.
"Every time we came back, we got lazy," center Kevin Seraphin said. "We have to learn that every time we come back, we have to keep going to get stops."
The Wizards cut the margin to 78-71 midway through the fourth quarter but didn't score again, missing their final eight shots.
Allen made two 3-pointers and a three-point play down the stretch for the Heat. He finished 8 for 12.
"When you're not scoring and they're running, we're not making them take the ball out of bounds," Wizards coach Randy Wittman said. "That makes a difference."
Jordan Crawford, who leads Washington in scoring this season, went 1 for 7 and was held to two points. Seraphin led the Wizards with 14 points off the bench.
NOTES: The crowd included New York Yankees slugger Alex Rodriguez, seated in the front row at midcourt next to Heat owner Micky Arison. ... The Heat begin their trip Tuesday at Indiana, where they're 9-35. ... The Heat had their best start shooting since Dec. 27, 2009 against the Pacers, when they made their first eight shots. ... Even with the loss, the Wizards are 3-3 against Miami over the past two seasons. ... Billy the Marlin drew scattered boos when he made an appearance to help celebrate Heat mascot Burnie's birthday. Fans are unhappy about the team's recent payroll purge.