Danton Heinen had his first NHL hat trick, and 15 other Bruins recorded a point as Boston extended its winning streak to four games.

BOSTON -- For the second game in a row, a Boston Bruins forward recorded a hat trick en route to a convincing win. On Thursday, it was David Pastrnak. Not a surprise.

On Saturday, it was Danton Heinen. Not as predictable. The 28-year-old forward, who went through free agency this summer without a contract and signed in Boston after a Professional Tryout Agreement (PTO) stint in October, led the Bruins to a 9-4 win against the Montreal Canadiens.

Everyone except Matt Poitras, Derek Forbort and goalie Linus Ullmark -- who made 17 saves -- recorded a point for Boston.

“I think it talks about the evolution of our team actually growing offensively,” Bruins coach Jim Montgomery said. “I don’t think we ever envisioned having a night like this. Over the course of 82 games, there’s some outliers, but I thought that we’ve been seeing this coming here for four games.”

The Bruins led 5-4 entering the third period before blowing the doors off in the final 20 minutes.

Cole Caufield opened the scoring for Montreal on the power play at 9:18 of the first period, extending his goal streak to five games.

Brandon Carlo tied it 1-1 at 12:47 in his return from a five-game absence with an upper-body injury on a rush with Trent Frederic, but Joel Armia gave Montreal the lead back at 14:43.

Jake DeBrusk tied it again 2-2 at 18:10, and Heinen redirected Matt Grzelcyk's shot pass to take a 3-2 lead at 19:05.

Mike Matheson tied it 3-3 on the power play at 6:16 of the second, but Heinen's second goal -- this time taking it himself through the neutral zone and firing top left corner -- made it 4-3 at 10:46.

“Some games you feel like you play well and you help the team and stuff like that, and it may not go in,” Heinen said. “Other nights you may not feel like you have it and sometimes it goes in, so I think that was maybe one of those nights tonight, but yeah, I just try to help the team, so it’s nice to help on the scoreboard, too.”

Charlie Coyle pushed it to 5-3 just 49 seconds later, tipping Pastrnak's pass in with a backhand.

“I’m still figuring out [line mates Pastrnak’s and Brad Marchand’s] tendencies,” Coyle said. “I mean, they’re world-class players, so just trying to create space and play my game. I’m not trying to overthink it. I’m just trying to play the way I know how and figure it out slowly along the way.”

Brendan Gallagher cut it to 5-4 at 13:19, but Pastrnak, Marchand, Zacha and Heinen each scored in the third period to lock up the dominant win.

Pastrnak reached 30 goals for the seventh time in his career, Marchand reached 20 goals for the 11th year in a row -- a new Bruins record -- and Zacha scored his 100th NHL goal.

The Bruins improve to 28-8-9 with their fourth win in a row. Their point streak was extended to eight games (5-0-3). Boston faces the Winnipeg Jets at home on Monday.

“We knew that was how we were going to win this year,” said Bruins captain Brad Marchand, who had a goal and an assist. “Obviously ‘Pasta’s’ an exception, he produces every night, but we win by committee here, and that’s how you need to win in the playoffs.”

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