Furnace II

Furnace II is the furnace that smelts iron. It makes everything Furnace I makes (bronze ingots, glass, bottles and flasks) and adds three recipes of its own: Iron Ingots, Golden ingots and Engineering Details. It comes with Iron Forge (35 red, after Bronze Polishing) and costs 6 Polished Stone, 2 Polished Bronze and 12 Bricks. Like Furnace I it stands in your yard, burns Fuel from a Firewood shed and works by itself once loaded.

Iron is the reason to build it. 3 Iron Ore and 30 Fuel make 3 Iron Ingots in about 3 minutes (12 steps of 15 seconds), with Smithing mastery 5. Every Iron Detail, iron nail, iron tool and piece of iron armor starts here, and most of them are then forged at the Iron Anvil.

Build cost

The cost depends on where it is built.

Where Build cost Demolishing returns
—
Polished Stone ×6
Polished Bronze ×2
Brick ×16
Polished Stone ×3
Polished Bronze ×1
Brick ×6
—
Polished Stone ×6
Polished Bronze ×2
Brick ×12
Polished Stone ×6
Polished Bronze ×2
Brick ×12

Crafted here (10)

Ingredients Outputs Mastery Duration Tech points
Glass ×2
Fuel ×10
Alchemy Flasks I × 2 ( Glassworker +1 )
2 9 2
Alchemy Flasks I ×3
Fuel ×10
Required extension: Bellows
Alchemy Flasks II ×1
Alchemy Flasks II ×1 Chance Glassworker +0.5
3 12 3
Glass ×1
Fuel ×10
Empty Bottle × 2 ( Glassworker +1 )
3 8 2
Steel Ingot ×1
Required extension: Casting Table
Engineering Details × 2 ( Gear Master +1 )
12 8 8
Sand ×3
Fuel ×10
Glass × 3 ( Glassworker +1 )
2 6 1
Copper Nugget ×3
Tin ×1
Fuel ×20
Bronze Ingot × 4 ( Fireman +1 )
2 9 2
Bronze Scrap ×3
Fuel ×10
Bronze Ingot × 2 ( Fireman +1 )
1 9 1
Golden nugget ×3
Fuel ×30
Required extension: Bellows
Golden ingot × 2 ( Fireman +1 )
4 9 3
Iron Ore ×3
Fuel ×30
Iron Ingot × 3 ( Fireman +1 )
5 12 3
Sand ×8
Fuel ×30
Required extension: Bellows
Lens × 2 ( Glassworker +1 )
5 12 3

Notes

  • It replaces Furnace I. Nothing Furnace I makes is missing here, so you only need to keep the old one if you want two batches running at once.
  • The Fireman perk counts even though the furnace works alone. Its extra ingot is read from your perks, not from whoever loaded the furnace.
  • Two of its recipes need extensions built against it. The Bellows (30 red, 4 Wooden Planks, 4 Bronze Nails, 2 Leather Scrolls) are needed for Golden ingots, the Lens and Alchemy Flasks II. The Casting Table is needed for Engineering Details. It comes with Steel Casting (150 red, 20 blue) and costs 4 Polished Stone, 4 Steel Ingots and 2 Steel Details.
  • Gold ingots come from another technology line. The recipe comes with Reanimation II (100 blue), on the resurrection line, and it needs 3 Golden nuggets for 2 ingots.
  • Dismantling it returns half the materials: 3 Polished Stone, 1 Polished Bronze and 6 Bricks.