I have no idea what happened was a glitch or pure luck but I used a heatwave against a Warthog that had 3 people in it, and 1 shot killed them all but left the warthog intact.
It also seemed to work on the Wasp, but by that time the match ended so I couldn’t tell.
I do like to know just how one heatwave shot killed everyone on the warthog at once (note I was about 10 to 20 meters away in game)