English import Amy Jones (60 not out) and Australian skipper Meg Lanning (56) were imperious for the visitors who sailed past the Heat's 7-146 with 10 balls to spare.
Scorchers too good today in front of an impressive home crowd in Brisbane!— Brisbane Heat (@HeatBBL) October 26, 2019
We'll be back tomorrow against @HurricanesWBBL at 1:10pm (QLD) 👊
Ticket still available 🎟️ https://t.co/qKxVXl1S1c#BringTheHeat #WBBL05 pic.twitter.com/viPR7joMgF
The Perth opening pair put on 129 for the first wicket before Brisbane finally broke through in the 16th over when Lanning chipped a Georgia Prestwidge leg-cutter to Amelia Kerr at mid-off.
"Jonesy took the pressure off me and we were able to build a really big partnership," Lanning said.
"We feel the depth in our batting is a strong point of ours.
"Having myself, Jonesy and Nat Sciver up to the top, it's pretty powerful."
No.3 Sciver joined player-of-the-match Jones in the centre and finished off proceedings by belting Kerr for successive legside boundaries.
The reigning champs let themselves down by conceding 13 wides after earlier losing 5-26 with the bat, preventing them from posting the type of imposing target that had looked on the cards when Beth Mooney was firing.
Mooney, who crunched a quickfire 67, was well supported by Maddy Green (34) but otherwise saw too many partners depart cheaply at the other end.
Jemma Barsby (2-19), playing against her old side, and Irishwoman Kim Garth (2-25) were the Scorchers' best bowlers.
Festival Weekend continues at Allan Border Field tomorrow with another double header. Limited tickets still remaining via Ticketek.com.au