Emitter not rendered in game

Hi there,
I wanted to make a cool heat distortion effect when something explodes. I can clearly see the effect in the Viewport. My Emitter loops continously, is not hidden in game and Auto activated. Unfortunately I could not see my effect with the Explosion, so I placed it infront of my camera. Still nothing can be seen. Does someone know why?
PS: I took the engine’s fire Emitter and deleted everything, except the heat distortion. That’s whats left in the s

cene.