@Meddler: Trying to make a Heat-user, but it's coming out too similar to Rumble.

Concept in question: http://boards.na.leagueoflegends.com/en/c/skin-champion-concepts/RMnR5Jth-ebonmaw-the-terror-of-zaun

I've gotten a few critiques on it that say that because the concept uses the Heat Resource, it becomes too similar to Rumble. What would you suggest I do to try and differentiate it, while still using the Heat Resource?