User blog comment:Xilinoc/Ch. 555 - THE HERO/@comment-9096222-20131030121501/@comment-11051098-20131105225913

Heat is the effect created by flames, so "The Heat" is closely related to creating flames.

If Candice is "The Thunder", her ability could be to create shock waves of sound strong enough to destroy solid items and maybe kill. Or create storm clouds using lightning to destroy and kill.