Update. The 200 is the same multiplier as tile to tile transfer. Debris on a tile get a 12.5 multiplier. Debris in a tile get the same 200 multiplier that tile to tile gets. Liquid to liquid gets a much larger multiplier so liquid to liquid beats this. I do find it odd that debris in a tile are so much more efficient than debris on a tile by a factor of 16.
Conveyor rails turn out to be one of the most efficient means of temperature exchange (applying a multiply by 200 factor in the