>>But due to the heat you get some kind of striation (Schlierenbildung ???), 
>>meaning the large temperature gradient causes a field of water with 
>>variable IOR surrounding the lava.
> 
> 
> Well heat ripples aren't so vital, unless it's an animation. But anyway it's 
> a good idea I'll see how it looks if I cheat with a simple change in IOR 
> along a bumpy surface.

Yeah - since you're not animating it, you could perhaps get away with a 
simple plane in front of the hot parts with weird normals to make it 
look all blurry and warped. Would only look correct from one direction - 
but that's all you need.

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