If you put the same Overheating jetpack inside a quantum armor, it doesn't accumulate heat nor explode, making this very exploitable (although I'm not brave enough to try it on my server)

Ok fixed the tooltip bug not displaying the heat.
But i can assure you the heat is summing up it just doesn't tell you xD
I just tried it and exploded rather fast xD

Oh my! And I was about to replicate this on my own server... Nice to know! Guess crime doesn't pay lol

Opening the issue because it fixes a bug anyways. The tooltip was bugged.