Rust Wiki

Information accurate as of: 904.83 Update


The Large Furnace is for players who want to smelt large amounts of ore at a time and spend less Low Grade Fuel making the furnace, and less wood in the operating costs. This variation of the Furnace is much more efficient, and has a whopping 18 slots! It is still very costly, but if you have the resources, consider investing in this production machine. However, there is one downfall to the Large Furnace: it must be placed on open terrain. It cannot be placed in the build zones down in caves or on a foundation, although it is possible to surround it with walls right next to it, unlike a Mining Quarry.

Use[]

The Large Furnace is used just like its normal sized counterpart. Simply put in a fuel source, some ore, and turn it on. The Large Furnace will then burn until it is turned off, or it runs out of fuel. To smelt ores faster, split them up and distribute them evenly across multiple slots. Just be sure to leave three slots open: one for the fuel source, one for the refined product, and one for the charcoal!

Efficient Smelting[]

High Quality Metal[]

High Quality Metal w/1k Wood (Charcoal Saved)
x1000
x6
x29
x60
x100
x100
x13
x39
x72
x100
x100
x21
x48
x87
x100
x100

Result =


x975


x750


Metal[]

1k Metal Ore (Charcoal Saved)
x336
x66
x66
x67
x67
x67
x66
x66
x67
x67
x67
x66
x66
x67
x67
x68

Result =

x1000
x251
2k Metal Ore (Charcoal Saved)
x695
x66
x138
x138
x138
x138
x138
x138
x138
x138
x139
x138
x138
x138
x138
x139

Result =

x2000
x521
2.8k Metal Ore (Charcoal Saved)
x1000
x66
x200
x200
x200
x200
x138
x200
x200
x200
x200
x200
x200
x200
x200
x200

Result =

x2804
x750
4.5k Metal Ore (Charcoal Saved)
x1000
x161
x400
x400
x400
x1000
x342
x400
x400
x400
x76
x400
x400
x400
x400

Result =

x4579
x1500
5.1k Metal Ore (Charcoal Saved)
x1000
x84
x373
x500
x500
x500
x1000
x175
x500
x500
x500
x500
x500
x500
x500

Result =

x5134
x1875
5.9k Metal Ore (Charcoal Saved)
x1000
x84
x374
x600
x600
x600
x1000
x175
x510
x600
x600
x600
x1000
x600
x600


Result =

x5943
x2250


Sulfur[]

1k Sulfur Ore (Charcoal Saved)
x168
x66
x66
x67
x67
x67
x66
x66
x67
x67
x67
x66
x66
x67
x67
x67

Result =

x1000
x126
2k Sulfur Ore (Charcoal Saved)
x348
x66
x138
x138
x138
x138
x138
x138
x138
x138
x139
x138
x138
x138
x138
x139

Result =

x2000
x261
3k Sulfur Ore (Charcoal Saved)
x540
x66
x215
x215
x215
x215
x138
x215
x215
x215
x215
x215
x215
x215
x215
x216

Result =

x3000
x405
4k Sulfur Ore (Charcoal Saved)
x748
x66
x298
x298
x298
x299
x138
x298
x298
x299
x299
x215
x298
x298
x299
x299

Result =

x4000
x561
5k Sulfur Ore (Charcoal Saved)
x975
x66
x297
x389
x390
x390
x138
x389
x389
x389
x390
x215
x389
x389
x390
x390

Result =

x5000
x732
5.1k Sulfur Ore (Charcoal Saved)
x1000
x66
x297
x400
x400
x400
x138
x389
x400
x400
x400
x215
x400
x400
x400
x400

Result =

x5105
x750
7.7k Sulfur Ore (Charcoal Saved)
x1000
x77
x161
x574
x800
x800
x1000
x252
x698
x800
x800
x352
x800
x800
x800

Result =

x7714
x1500


8k Sulfur Ore (Charcoal Saved)
x1000
x71
x231
x533
x800
x800
x1000
x148
x322
x659
x800
x800
x422
x800
x800
x800

Result =

x7986
x1500


8.3k Sulfur Ore (Charcoal Saved)
x1000
x83
x274
x636
x1000
x1000
x1000
x174
x385
x778
x1000
x1000
x500
x1000
x1000

Result =

x8330
x1873


8.5k Sulfur Ore (Charcoal Saved)
x1000
x76
x160
x251
x351
x462
x1000
x587
x730
x898
x1000
x500
x1000
x1000
x1000
x1000

Result =

x8515
x1873


Notes[]

  • It takes 120 seconds to craft one Large Furnace.
  • The large furnace has 18 slots (3 times that of the normal furnace)
  • The rate of smelting does not differ in the large furnace. It allows for more simultaneous smelting.
  • The Large Furnace costs 100 less Stone and half the Low Grade Fuel than its equivalent, three regular Furnaces, would cost. Compared with the amount of wood used by a regular furnace, it burns about 40% as much wood for Metal Ore, 80% when making Sulfur, and about one third for High Quality Metal. The ratio of wood to charcoal is the same for both furnaces; an amount exactly or almost exactly equal to three quarters of the amount of wood burned.
  • Must be placed on open terrain, It cannot be placed on a foundation. Update: As of devblog 159 or 160 they can now be placed inside with a floor grill above (for ventilation) so they can now be secured in your base.
  • Cannot be placed on steep hills.
  • For truly huge operations, the consideration of total space becomes greater, and it may be preferable to spend more on wood and keep the building footprint smaller, with a giant room full of normal Furnaces.


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