A sell-out crowd of 5,368 - and several hundred more watching from vantage points outside, created a special atmosphere for the WBBL's showpiece event.
Sixers captain Ellyse Perry won the toss and elected to bat first, and top-scored with 33 off 37 balls. She built a 43-run partnership with Ash Gardner (23 off 28 balls), but both players were dismissed before they could put the foot on the accelerator.
Some late hitting by Dane van Niekerk (32 not out off 15 balls) was the highlight of the Sixers' innings, as the home side posted a total of 7/131.
Van Niekerk hit 2 fours and 2 big sixes in her innings.
The South African international was heavily involved in the start of the Heat's innings, running out Grace Harris, before her compatriot Marizanne Kapp knocked Sammy-Jo Johnson over, to have the visitors in trouble at 2-14.
Beth Mooney (65 off 46) and Kirby Short (29) put on an 84-run partnership for the third wicket.
There were several nervous overs after Dane Van Niekerk removed Short and Mooney in the 15th over.
Mooney was undone by a diving Ellyse Perry catch at at deep midwicket and when Jess Jonassen was caught lbw, the Heat had lost 3-5.
Yet the Heat were good enough to get over the line in what was a fitting tournament finale.