Furnace

The Furnace is a crafting station that smelts raw ores into ingots, alloys, and other processed metals. It is one of the most essential stations in the game, required for producing nearly all metal components used in tool upgrades, building, vehicle construction, and advanced crafting. The Furnace has three tiers, each unlocking additional smelting recipes while retaining all recipes from previous tiers.

How to Obtain

The Furnace I blueprint is included in the Equipment Blueprint Pack, which is available for free from the General Store early in the game. This pack also includes the Cutter I and Charcoal Kiln blueprints. Once you have the blueprint, build the Furnace at a Worktable I using 5 Stone.

To use the Furnace, place it on your farm, interact with it, select a recipe from the list, and provide the required ore and fuel. Unlike the Brewing Barrel or Cutter, the Furnace processes items relatively quickly, so you generally do not need multiples of it.

Upgrade Path

Crafting stations in Starsand Island are upgraded through the station's own interface. Interact with the Furnace, select the Upgrade button in the bottom-left corner, and provide the required materials. The station transforms in place without needing to be broken down and rebuilt.

Upgrading an existing Furnace costs fewer materials than building a new one from scratch. If you already have a Furnace I placed on your farm, upgrading it to Furnace II is always cheaper than crafting a standalone Furnace II.

Fuel

All smelting recipes require fuel in addition to the raw ore. The fuel type changes depending on the recipe tier.

Charcoal is crafted at the Charcoal Kiln, which is obtained alongside the Furnace in the Equipment Blueprint Pack. A Charcoal Kiln converts Softwood and Fiber into Charcoal. The Charcoal Kiln is also used to produce Salt from Salt Brick and Fiber.

Furnace Tiers

The Furnace upgrades through three tiers. Each higher tier retains every recipe from the tier below while adding new ones. Higher tiers also process batches faster.

Furnace I

The starting tier, available from the Equipment Blueprint Pack. Handles early-game smelting using Charcoal as fuel.

Copper Ingots are the first metal you will smelt. They are needed for tools like the Impulse Pickaxe, the Ore Analyzer, and various early-game equipment. Bronze (a Copper-Tin alloy) is used for the Bronze Pickaxe, which is required to mine Iron Ore in the Moonlit Forest. Stone Bricks and Glass Bricks are key building materials used in farm structures, fences, and home upgrades.

Furnace II

The second tier is unlocked through the Crafter profession questline with Zerine. Progressing through the Apprentice and Junior Crafter trials unlocks the Furnace II blueprint at the General Store. Furnace II uses Coal instead of Charcoal for its new recipes, though Furnace I recipes carried over still use Charcoal.

Iron Ingots are the workhorse metal of mid-game. They feed into tools, building materials, vehicle parts, and dozens of crafting recipes. Gold Ingots are used for premium crafting, jewelry (excellent NPC gifts), and special structures like the Selective Breeding House. Alloy is a composite metal combining Copper, Iron, and Gold Ingots; it is used in advanced equipment and is itself a component in upgrading to Furnace III.

Furnace III

The final tier, unlocked at the Senior Crafter level. Furnace III recipes use Oilstone as fuel rather than Coal. The ores required for these recipes are found in the deepest zones of the Moonlit Forest.

These endgame materials are used in Expert-tier tools, the most powerful equipment, and late-game building projects. Aurorite Ingot is needed for the Aurorite Pickaxe, which can mine the rarest ores (Oilstone, Starflare Crystal, Diamond). Eternal Alloy is required for top-tier tools like the Electric Drill and Chainsaw. Because Eternal Alloy requires both Aurorite Ingot and Flamecore Ingot, plan your ore runs to collect Aurorite Ore and Flamecore Ore in the same trip.

Processing Speed

The Furnace I (Stone Furnace) processes one batch in approximately 30 seconds of game time. Furnace II and III cut processing time to approximately 15 seconds and handle larger batches. The faster speed at higher tiers makes bulk smelting significantly more efficient.

Tips

• Keep a stockpile of Charcoal and Coal. Running out of fuel in the middle of a smelting session is a common bottleneck. Build extra Charcoal Kilns if needed.

• Copper Ore and Tin Ore are found on the surface and in the early Moonlit Forest zones. You do not need to go deep for Furnace I materials.

• Prioritize the Crafter profession questline with Zerine to unlock Furnace II as early as possible. Iron Ingots are needed for a huge number of mid-game recipes.

• The Ore Analyzer is worth using before smelting. It has a 5 to 10% chance of producing rare bonus drops from raw ore, which can save mining trips.

• Unlike the Cutter and Brewing Barrel, the Furnace processes quickly enough that you rarely need more than one. One Furnace handles most smelting needs.

• Smelt all your raw ore before leaving the Moonlit Forest if you have a camp with a Furnace. Ingots stack efficiently and weigh less than raw ore in your inventory.

• Always upgrade an existing Furnace rather than crafting a new higher-tier one from scratch. Upgrading uses fewer materials than building a standalone Furnace II or III.

• Stock up on Oilstone before you start Furnace III smelting. Every Furnace III exclusive recipe requires Oilstone as fuel, and it is only found in the deepest forest zones.

• When crafting Eternal Alloy, remember that it requires Alloy as an input. Alloy itself needs Copper Ingot, Iron Ingot, and Gold Ingot, so gather all three ore types on your forest runs.