The Senators got their season-high fourth straight win and reached .500 for the first time since Oct. 28. It was Heatley's second hat trick of the year and he had an assist for a season-high four points. His last three-goal game was Oct. 26 at Toronto.
Dean McAmmond and Mike Fisher added goals for the Senators. Ray Emery had 33 saves.
Gary Roberts scored two goals for the Panthers. Stephen Weiss and Drew Larman also scored. It was Larman's first career NHL goal in two games. Ed Belfour stopped 26 shots.