Kerr, who the Heat knew would be a late arrival when they drafted her as expected, led the run chase after a miserable performance with the ball in her first appearance of the season.
Kerr had success in her second over when she removed Heather Graham lbw amid a stuttering Hobart Hurricanes batting display and then added Ruth Johnston with her final delivery.
When Grace Harris was close to Molly Strano’s first ball, beaten by one she followed up with her arm, there was confidence in the Hurricanes camp and Shabnim Ismail removed Georgia Redmayne to leave them 26 for 2.
However, from there, Kerr had things under control with a half-century off 38 balls, adding 57 for the third wicket with Mignon du Preez before Knott helped end the chase.
Ismail impressed again with the ball, sending 13 dots in his four overs.
