How to Make Liquid Heat Exchanger in Minecraft

Liquid Heat Exchanger is an Industrial Craft 2 heat generator that extracts heat from fluids, and since build 694 the machine accepts exactly two inputs: lava, which converts into pahoehoe lava, and hot coolant, which converts back into coolant. The heat leaves through the output face marked with an orange square — the face that points toward the player when the machine is placed — so a heat-consuming machine's input side connects directly there. The GUI offers ten slots for Heat Conductors, and at least two are required for the machine to run: every additional Heat Conductor adds 10 hU, scaling the output from the minimum of 20 hU/t to the maximum of 100 hU/t, with the current value shown at the top of the GUI.

One Liquid Heat Exchanger is crafted in a shaped recipe from four glass blocks, two fluid cells, two iron casings and one Heat Conductor. The machine runs only when the produced heat has somewhere to go and when the output fluid fits into the right tank, and redstone signals do not affect the always-running machine. The left tank receives the input fluid from a cell placed in the slot beneath it, and an emptied universal fluid cell comes back in the neighbouring slot, while the right tank collects the converted output. A Fluid Ejector Upgrade in one of the three upgrade slots ejects coolant or pahoehoe lava into a fluid distributor for automated loops, and pahoehoe lava exists nowhere else in Industrial Craft 2. One bucket of lava carries 20,000 hU — equal to 10,000 EU through a Stirling Generator — which makes the Liquid Heat Exchanger a steady heat source for any base with lava to spare.