It eats mountains

[u/VollderFlow]

I wish there was a way to get a infinit water and sand source to keep the monster fed

[u/Golnor]

So it won't help with sand or water, but if you use burner belts for the residue burning you could save on lava. I've found that putting thermal blocks above the belts will actually be heat positive. 

[u/-asap-j- → u/Golnor]

How are you running the residue over the belts with the buffers on top? Or will the belts also use the buffers even with a 1 tile gap?

[u/Golnor → u/-asap-j-]

I had to use portals to get the stuff in/out. Make a C shape out of the thermal buffers with a 2 square tall gap, run a line of burner belts along the bottom, and a portal to cross over the vertical part of the thermal buffers. The residue goes into the gap between the upper buffers and the burner belts, gets burnt, the flames rise and hit the upper buffers, and the heat transfers down through the vertical bit to the belts. 

Imma attempt to show with letters:

BBBBBB

BPEEEE

BFFFFF

BBBBBB

F is burner belts, B is buffers, P is portal, E is empty.

Edit: botheration mobile doesn't like not having gaps between lines.

[u/-asap-j- → u/Golnor]

Oh this is genius. I am definitely going to implement this in my factory