Matthew Phillips and Jakob Pelletier each had multi-point efforts in the loss.
Stockton looks to close out the Pacific Division Finals Friday at Colorado.
Wolf earns his second shutout in as many nights, Kirkland adds game-winner as Heat push Colorado to the brink.
The Heat look to push their series lead to two games on Tuesday.
Wolf turned away all 23 shots faced as the Heat took a 1-0 series lead.
The Flames' AHL club will move to Calgary starting with the 2022-23 season.
The Pacific Division Finals start Monday at Stockton Arena.
The schedule for Stockton's third-round matchup against Colorado has been finalized.