FIELD REFERENCE / Crafting & machines
Probably Stolen Furnace Guide
Make a reliable ingot batch before chasing a more complicated module combination.
A standard Furnace turns two pieces of scrap or ore into one ingot overnight, with a listed base demand of 8 energy. Put the materials in the machine, provide power and leave output space. Ore improves the baseline result; flux and Quality affect purity, while Blast changes the batch size.
Recipe note: the normal batch is corroborated by the Steam machine guide and release references. Older Blast-purity tables disagree with release references, so this page does not promise an exact upgraded purity formula.
Get the machine and prepare its workspace
The community machine reference identifies Dr. Jackson as a Furnace supplier. Check the offered item's condition and the resources required to run it, not just the purchase price.
Our advice is to reserve three distinct areas: incoming metal, the machine and finished ingots. Keep ore you are saving for a higher-quality batch out of an unplanned input mix. Before buying a module, first prove that an ordinary batch can run through your setup.
Evidence: Wikily: Furnace recipes and modules
Smelt the first batch
- Open the Furnace and place two eligible metal inputs in it. The normal requirement is two total pieces, not two of every material type.
- Keep its output area clear. Do not count an occupied output slot as usable space just because another storage bay is empty.
- Provide sufficient energy for the machine's current demand. The normal reference is 8; modules can change what your setup needs.
- Finish the day and let the overnight process run. Moving the ingredients into the shop without loading the machine is not enough.
- Inspect the resulting ingot's grade and remove it. Record the inputs before changing flux or modules so you can compare the next batch.
Evidence: Furnace release recipe reference · Wikily: Furnace recipes and modules
Compare unmodified scrap and ore batches
These are baseline recipes without extra Quality or flux. The material mix matters, but a higher grade is only a better investment if its output value or downstream use justifies the more expensive input. Compare actual buying and selling prices in your run.
| Normal inputs | Baseline ingot | Use case |
|---|---|---|
| 2 Scrap Metal | Low purity | A simple first batch or inexpensive material processing. |
| 1 Scrap Metal + 1 Metal Ore | Fair purity | A comparison point when deciding how much to pay for ore. |
| 2 Metal Ore | High purity | A higher baseline before considering upgrades. |
Evidence: Steam: Machinery and You · Wikily: Furnace recipes and modules
Understand flux and specialized modules
Performance does not turn the Furnace into a multi-batch-per-night production line in the references used here. Read the module's actual effect before buying it for throughput. Where older and release tables disagree, use a controlled batch in your game to resolve the result rather than treating a demo formula as current.
| Change | What it is for | Check before running |
|---|---|---|
| Basic Flux | Raises the quality contribution when it helps | It can be consumed; it is not a replacement for metal. |
| Advanced Flux | Reusable flux assistance | It is not an unlimited stack of extra purity on top of every setup. |
| Quality modules | Increase the purity contribution | Thresholds matter; inspect the finished grade. |
| Blast Module | 3 metal inputs produce 2 ingots | Expect a purity tradeoff and reserve room for both outputs. |
| Junk Processing Module | 6 Junk become 4 Scrap on a non-smelting night | Do not expect an ordinary smelting job and junk processing to run together. |
Evidence: Wikily: Furnace recipes and modules · Furnace release recipe reference
Diagnose an empty output slot
| Check | Fix |
|---|---|
| Not enough eligible inputs | Count the pieces inside the machine; check the active module's recipe. |
| Insufficient energy | Read current demand and supply adequate charge. |
| Output blocked | Remove old ingots and reserve additional room for Blast output. |
| Only Junk loaded | Confirm Junk Processing is installed and no smelting job takes priority. |
| Unexpected purity | Compare material mix, flux and Quality with the baseline; do not use an older Blast table. |
| Wrong timing | Evaluate the result after an overnight cycle, not immediately after loading. |
COUNTER QUESTIONS
Frequently asked questions
Can one piece of scrap produce an ingot?
The standard recipe requires two eligible metal pieces in total. Blast uses a different three-input batch.
Is flux another metal ingredient?
No. It influences the quality contribution; the batch still needs its full metal input count.
Does Performance make multiple batches each night?
The machine references say it smelts once per night. Do not buy Performance solely on the assumption that it adds another furnace cycle.
Sources & evidence
Source notes identify the basis for this guide. Your current in-game tooltips and dialogue take precedence when a patch or mod changes a mechanic.
- Wikily: Furnace recipes and modules ↗
Community machine reference. Used to cross-check normal batches and module functions; no unsupported perfect-purity recipe is promised.
- Furnace release recipe reference ↗
Community reference for normal batches, energy, output space and module tradeoffs. Conflicting Blast purity tables are omitted.
- Steam: Machinery and You ↗
The Exceptional Fisherman's guide explicitly warns that some release information is missing. Used only where the basic furnace recipe is corroborated.
Found a discrepancy? Send the page link and supporting evidence.