⚠️ Eco v0.14 is coming — the next major update reworks upgrade modules, so some of these numbers will change. They reflect the current version. What’s changing →

Simpler tiers: the 1–4 tiered upgrades become a single Basic / Advanced / Modern upgrade each.
Permanent upgrades: a module placed in a workstation is permanent — no more swapping lower tiers out as you progress.
Power transitions: a module can change a station’s power type/draw (e.g. a Modern upgrade moves a sawmill from mechanical to electrical power).
Talent-integrated: modules now use the same bonus/talent system — any talent benefit (power, labor cost, recipe unlocks) can come from a module.
Cheaper to upgrade: with the multi-tier parts gone, fully upgrading a workstation costs significantly less.

We’ll update this calculator shortly after the update releases.

Home › Items › Blast Furnace

Blast Furnace

WorldObject

A superior replacement for the bloomery that can produce steel.

Weight10000 gMax stack1Air pollution2.4 ppm/hSkillMechanics Lv 3StationAssembly Line

Notes

The Blast Furnace is a crafting table and world object that serves as a superior replacement for the bloomery, enabling the production of steel. As a polluter, its industrial activity can impact the shared environment, which may affect nearby housing value and ecosystem fertility. To maximize efficiency, place this station in a room of an appropriate material tier to unlock higher-quality upgrade modules that reduce resource costs and craft time.

Notes are AI-generated and may be imprecise.

⚙ Craft calculator — adjust for your modules, skill & talents

▶ Open the full recipe page

Upgrade modules

Mechanics Advanced Upgrade (−25% cost)

Mechanics level 0Skill level changes labor only.

Talents

Improved Assembly (Mechanics) Sample Power Efficiency (Mechanics) Improved Assembly (Mechanics Lv 6)

Quantity to craftScales ingredients, labor, time, output & total raw by the number of crafts.

Ingredients

Ingredient	Qty	Type
Screws	12	item
Brick	8	item
Iron Plate	12	item
Iron Pipe	8	item

Crafting

Labor	600 calories
Craft time	25 min
Throughput	≈ 2.4 Blast Furnace / hour (base)

As a placed object

RoomIndustrialSize3×5×3

Viewer

Requires connection ports — highlighted below.

Placement

AlignmentMust be grid-aligned

Room requirements

IndoorsIn an enclosed roomRoom tierTier 3Room volume72 m³

Operating

Labor50–6000 cal

Accepts upgrade modules

Crafted here

Total raw to craft this

Steps42Total labor12507.5 calTotal time164.96 min

190× Limestone
157.5× Iron Ore
133× Wood (any)
45× Cement
40× Shale
32.13× Clay
32× Hewn Log (any)
30× Quicklime
19.13× Silica (any)
8× Wooden Mold
2× Rebar

Approximate — category ingredients and any production cycles are counted as raw.

Categories

Obtained from

Blast Furnace

See also

Combustion Generator

Industrial Barge

Industrial Generator

A roaring furnace that forges civilization's spine, its breath darkening the sky as it breeds steel from raw earth.