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Furnace

The Furnace is RNGTech's heat-aware smelter. Each recipe needs the machine to warm up to a target temperature first, so the Furnace's stage and installed Heat Core decide which ores and alloys it can smelt. Stage 0 burns ordinary furnace fuel. Stages 1–8 are electric chassis that run on FE.

Like every RNGTech machine, each Furnace you craft rolls its own rarity and affixes, and it can level up through Machine Mastery.

You can read a Furnace from the outside. The Stage 0 Furnace is a smooth-stone kiln: fuel burns in the fire mouth at the bottom, the item being smelted sits in the oven above it, and smoke rises from the copper-banded chimney while fuel burns. An electric Furnace shows the item it is smelting on the hearth behind its viewport door. As the lane heats up, the chamber and its heating elements glow from dull red through orange to yellow-white. The bar under the door reads like the heat bar on the Process tab: it fills with the lane's heat against the Heat Core's Max Temperature, a white mark shows the recipe's target and a yellow mark the setpoint when the slider pushes past it, and the fill turns red while the lane overheats. A lane pushed past its target flickers with its wobble. With extra lanes, the items stand side by side on the hearth and the bar reads the hottest lane. The Heat Core sits on the crown as a row of fins in the core's material. Facing the front, the Battery Cell stands in the cradle on the left with its charge meter, the Nitrogen tank is the gas cylinder behind it, and the cable port is on the back. The window on the cylinder shows how full the tank is, and its valve lights up while a lane uses Nitrogen. The Lead Furnace has four small chambers, one per lane: under each column of doors, the upper half of the bar reads the top chamber and the lower half the bottom one. Each chassis has its own shell metal.

Obtaining

Crafting

Each stage has its own recipe. You do not need the previous stage's Furnace to craft the next one.

IngredientsCrafting recipeNotes
Furnace
Smooth Stone +
Copper Ingot +
Machine Frame +
Furnace		Smooth StoneCopper IngotSmooth StoneSmooth StoneMachine FrameSmooth StoneSmooth StoneFurnaceSmooth StoneFurnace
Iron Furnace Chassis
Iron Ingot +
Basic Electric Circuit +
Redstone Dust +
Machine Frame +
Copper Ingot +
Smooth Stone		Iron IngotBasic Electric CircuitIron IngotRedstone DustMachine FrameRedstone DustCopper IngotSmooth StoneCopper IngotIron Furnace ChassisRequires the Iron material to be enabled.
Requires the Copper material to be enabled.
Copper Furnace Chassis
Copper Ingot +
Basic Electric Circuit +
Redstone Dust +
Machine Frame +
Smooth Stone		Copper IngotBasic Electric CircuitCopper IngotRedstone DustMachine FrameRedstone DustCopper IngotSmooth StoneCopper IngotCopper Furnace ChassisRequires the Copper material to be enabled.
Bronze Furnace Chassis
Bronze Ingot +
Basic Electric Circuit +
Redstone Dust +
Machine Frame +
Calibrated Thermal Component +
Smooth Stone		Bronze IngotBasic Electric CircuitBronze IngotRedstone DustMachine FrameRedstone DustBronze IngotCalibrated Thermal ComponentSmooth StoneBronze Furnace ChassisCalibrated Thermal Component must be a Thermal calibration, Stage 2+, stability 45+.
Requires the Bronze material to be enabled.
Steel Furnace Chassis
Steel Ingot +
Advanced Electric Circuit +
Calibrated Thermal Component +
Reinforced Machine Frame +
Smooth Stone		Steel IngotAdvanced Electric CircuitSteel IngotCalibrated Thermal ComponentReinforced Machine FrameCalibrated Thermal ComponentSteel IngotSmooth StoneSteel IngotSteel Furnace ChassisCalibrated Thermal Component must be a Thermal calibration, Stage 2+, stability 55+.
Requires the Steel material to be enabled.
Lead Furnace Chassis
Lead Ingot +
Advanced Electric Circuit +
Calibrated Thermal Component +
Reinforced Machine Frame +
Smooth Stone		Lead IngotAdvanced Electric CircuitLead IngotCalibrated Thermal ComponentReinforced Machine FrameCalibrated Thermal ComponentLead IngotSmooth StoneLead IngotLead Furnace ChassisCalibrated Thermal Component must be a Thermal calibration, Stage 2+, stability 55+.
Requires the Lead material to be enabled.
Aluminum Furnace Chassis
Aluminum Ingot +
Advanced Electric Circuit +
Calibrated Thermal Component +
Advanced Machine Frame +
Smooth Stone		Aluminum IngotAdvanced Electric CircuitAluminum IngotCalibrated Thermal ComponentAdvanced Machine FrameCalibrated Thermal ComponentAluminum IngotSmooth StoneAluminum IngotAluminum Furnace ChassisCalibrated Thermal Component must be a Thermal calibration, Stage 2+, stability 60+.
Requires the Aluminum material to be enabled.
Titanium Furnace Chassis
Titanium Ingot +
Elite Electric Circuit +
Calibrated Thermal Component +
Advanced Machine Frame +
Smooth Stone		Titanium IngotElite Electric CircuitTitanium IngotCalibrated Thermal ComponentAdvanced Machine FrameCalibrated Thermal ComponentTitanium IngotSmooth StoneTitanium IngotTitanium Furnace ChassisCalibrated Thermal Component must be a Thermal calibration, Stage 2+, stability 70+.
Requires the Titanium material to be enabled.
Tungstensteel Furnace Chassis
Tungstensteel Ingot +
Elite Electric Circuit +
Calibrated Thermal Component +
Exotic Machine Frame +
Smooth Stone		Tungstensteel IngotElite Electric CircuitTungstensteel IngotCalibrated Thermal ComponentExotic Machine FrameCalibrated Thermal ComponentTungstensteel IngotSmooth StoneTungstensteel IngotTungstensteel Furnace ChassisCalibrated Thermal Component must be a Thermal calibration, Stage 2+, stability 75+.
Requires the Tungstensteel material to be enabled.
Exotic Furnace Chassis
Naquadah Ingot +
Ultimate Electric Circuit +
Calibrated Thermal Component +
Exotic Machine Frame +
Smooth Stone		Naquadah IngotUltimate Electric CircuitNaquadah IngotCalibrated Thermal ComponentExotic Machine FrameCalibrated Thermal ComponentNaquadah IngotSmooth StoneNaquadah IngotExotic Furnace ChassisCalibrated Thermal Component must be a Thermal calibration, Stage 2+, stability 85+.

Breaking

Mine a placed Furnace with a pickaxe. It drops itself and keeps its rolled traits and Mastery progress.

Usage

Smelting

Put items in the top input slot. Each lane heats up and starts smelting once it reaches the recipe's temperature, and leaks heat while it has nothing to smelt. The Furnace pays FE, or fuel, for the heat it puts in, including what its walls lose, so a hotter lane costs more per smelt. See Heat for how lanes heat and the overheat slider on the Process tab.

Each metal smelts at its own pace: low-melting Lead and Tin in half the time of Iron, high-melting Osmium, Titanium, and Tungsten in two and a half to four times as long. The FE per smelt does not change.

Heat decides your progress. Unmodified electric chassis reach about:

Heat Core Max temperature Unlocks
Stage 0 Furnace (no core) 800 Iron and Copper
Iron Heat Core 800 Iron and Copper
Copper Heat Core 1,000 Bronze ingredients and other early metals
Bronze Heat Core 1,200 Mid-tier metals
Steel Heat Core 1,400 Stage 4 metals
Sparksteel Heat Core 1,600 High-heat metals
Titanium Heat Core 1,800 Late-game metals
Exotic Heat Core 2,200 Every metal recipe
Aluminum Heat Core 850 Low-heat Stage 5 sidegrade that heats up much faster

Vanilla ores and raw metals go through the same heat gates as RNGTech metals, so you cannot skip heat progression by smelting them directly.

Crushed material smelts straight into ingots, which is handy for simple hopper lines, but it takes three times as long and costs 50% more FE than smelting dust. Crush it into dust first for faster, cheaper smelting.

There is no Steel Dust smelting recipe. Steel comes from Steel Blend, which you make in the Alloy Furnace and then smelt here.

Stage 4 and higher metal recipes also need temperature stability. A Stage 0–3 Furnace will not start one without enough stability. A Stage 4 or higher Furnace starts it anyway, but poor stability or heat above the recipe's safe maximum builds up failure strain. A lane left above the recipe's overheat temperature by a hotter recipe cools down to it before smelting, so switching to a cooler metal costs time instead of ingots. Higher Overheat Tolerance shortens that wait. When strain fills, the input becomes a Malformed Ingot of that metal. Smelt it again to get two nuggets back. On any Furnace, a metal smelt pushed past its overheat temperature with the overheat slider builds strain the same way. Ancient Debris never fails.

Stages

Stage Furnace Notes
0 Furnace Burns standard furnace fuel. Slow, and reaches 800 heat.
1 Iron Furnace Chassis First electric Furnace.
2 Copper Furnace Chassis Better early heat throughput and energy use.
3 Bronze Furnace Chassis Smelts Bronze Blend and Steel Blend faster.
4 Steel Furnace Chassis More efficient midgame chassis.
4 Lead Furnace Chassis Four smelting lanes sharing one Heat Core, at half the base speed.
5 Aluminum Furnace Chassis Fast, efficient body with quick heat transfer.
6 Titanium Furnace Chassis High-heat advanced chassis.
7 Tungstensteel Furnace Chassis Heavy late-game heat chassis.
8 Exotic Furnace Chassis Optional endgame chassis.

Higher-stage metal recipes need more heat: Stage 5–8 recipes take 2×, 3×, 4× and 6× the early baseline, and recipes needing 1,750 heat or more twice that again.

Batching

With a Batch Size above 1, each lane smelts several items from its input stack in one cycle. A batch takes as many items as the stack and the lane's free output space allow, up to the Batch Size, and keeps that count until the cycle ends. Each extra item makes the cycle longer by the Batch Overhead, 25% of one item's time to start with. Every item still absorbs its own heat, paid in FE or burn time, and earns its own XP. A bigger batch takes a bigger heat dip from the lane when it goes in. If a batch fails, every item in it becomes a Malformed Ingot.

Gear

Electric Furnaces have a Gear tab with:

  • one Heat Core slot. The core's stage cannot exceed the chassis stage. On the Lead Furnace one core heats all four lanes. A Lead Furnace built before lanes shared their core keeps its first core; the others go into an inventory beside it, or drop once a player is nearby.
  • one Battery Cell slot. Without a cell, the Furnace keeps only a small internal buffer and smelts more slowly. If the Furnace has enough FE stored but the cell cannot hand it over fast enough for the current work, the status reads Cell Rate Limited instead of No Power. A cell with a higher Output rate fixes it.

The Stage 0 Furnace burns fuel from a slot on its Process tab and does not need Gear to run. Its Efficiency, Fuel Efficiency, and Fuel Duration stats all make each fuel item burn longer, so one item smelts more.

Automation

Side Behavior
Top Inserts into the input lane(s). Accepts only items with a Furnace recipe.
Bottom Extracts finished output.
Sides Fuel on Stage 0, Battery Cells on electric stages.
Any Electric stages accept FE, for example from a Universal Cable, and Nitrogen for the Nitrogen atmosphere.

Automation fills the input lanes in order: lane 1 takes a full stack before lane 2 gets anything, so a slow feed into a Lead Furnace keeps one lane busy while the others sit idle. The Even Feed keystone on the Machine Mastery tree changes that. With it, each item that arrives through automation goes to the emptiest lane that can hold it, so a hopper trickle or a full stack from a cable spreads across every lane. It does not change which items the Furnace accepts, and a lane never holds two kinds of item. Items you place by hand still go where you put them. Even Feed sits right on a road, 15 points from the Furnace start, and has no downside beyond the points it costs.

Mastery and Ascendancies

Smelting ores, raw metals, crushed ores, and alloy blends earns Furnace Mastery XP, and you spend the points on the shared Machine Mastery tree. Reversible dust-to-ingot smelts, food, and decorative blocks earn no XP. Furnaces choose between the Crucible Keeper and Bloomer ascendancies. Crucible Keeper's Overdrive speeds a lane up only past the recipe's safe maximum, so it needs the Blast Draft keystone to let the overheat slider go that far.

Two keystones cap your heat in exchange for speed or savings. Each cap only stops Gear from going higher; it never raises a weaker Heat Core. Compare the caps with the heat column in the recipe table.

  • Flash Annealing caps Max Temperature at 1,000 heat. It gives 100% more Processing Speed, with 50% more Energy Usage and 50% less Fuel Efficiency. An electric Furnace smelts twice as fast, and each smelt costs 1.5 times the FE. A Stage 0 Furnace smelts twice as fast for the same fuel per smelt.
  • Low Heat Specialist caps Max Temperature at 800 heat, enough for Iron and Copper. It gives 50% less Energy Usage and 100% more Fuel Efficiency, so each smelt costs half the FE or fuel at the same speed.

Other Furnace keystones:

  • Quench Protocol halves temperature failure strain, for 25% less Heat Transfer.
  • Closed Loop Recuperator returns 25% of each electric smelt's FE to the internal buffer, for 15% less Processing Speed.
  • Thermal Reservoir gives 40% more Heat Insulation and 50% more Thermal Mass, so the Furnace keeps its heat between jobs and through load dips, but warms up more slowly from cold.
  • High Flux gives 100% more Heat Transfer for 25% more Energy Usage and 40% less Fuel Duration.

Furnace recipes

The Furnace uses its own recipe type, rngtech:furnace, which covers vanilla smelting as well as RNGTech metals, alloy blends, and malformed-ingot recovery.

InputOutputTimeHeatBonus outputMin. temperatureMastery XPMalformed materialTemperature stabilityFailure material
Bronze Blend→Bronze Ingot8 s1,440 HUNo7001
Steel Blend→Steel Ingot12 s5,573 HUNo1,1003
Malformed Ingot→Aethergold Nugget220 s720 HUNo400Aethergold
Malformed Ingot→Aluminum Nugget220 s720 HUNo400Aluminum
Malformed Ingot→Arclite Nugget220 s720 HUNo400Arclite
Malformed Ingot→Bronze Nugget220 s720 HUNo400Bronze
Malformed Ingot→Copper Nugget220 s720 HUNo400Copper
Malformed Ingot→Gold Nugget220 s720 HUNo400Gold
Malformed Ingot→Invar Nugget220 s720 HUNo400Invar
Malformed Ingot→Iron Nugget220 s720 HUNo400Iron
Malformed Ingot→Lead Nugget220 s720 HUNo400Lead
Malformed Ingot→Naquadah Nugget220 s720 HUNo400Naquadah
Malformed Ingot→Netherite Nugget220 s720 HUNo400Netherite
Malformed Ingot→Nickel Nugget220 s720 HUNo400Nickel
Malformed Ingot→Nullite Nugget220 s720 HUNo400Nullite
Malformed Ingot→Osmium Nugget220 s720 HUNo400Osmium
Malformed Ingot→Platinum Nugget220 s720 HUNo400Platinum
Malformed Ingot→Silver Nugget220 s720 HUNo400Silver
Malformed Ingot→Sparksteel Nugget220 s720 HUNo400Sparksteel
Malformed Ingot→Steel Nugget220 s720 HUNo400Steel
Malformed Ingot→Tin Nugget220 s720 HUNo400Tin
Malformed Ingot→Titanium Nugget220 s720 HUNo400Titanium
Malformed Ingot→Tungsten Nugget220 s720 HUNo400Tungsten
Malformed Ingot→Tungstensteel Nugget220 s720 HUNo400Tungstensteel
Malformed Ingot→Zinc Nugget220 s720 HUNo400Zinc
Crushed Aluminum→Aluminum IngotMalformed Ingot22.5 s12,741 HU1,30040.95Aluminum
Aluminum Dust→Aluminum IngotMalformed Ingot7.5 s8,494 HU1,3000.95Aluminum
Aluminum OreDeepslate Aluminum Ore→Aluminum IngotMalformed Ingot11.25 s12,741 HU1,30040.95Aluminum
Raw Aluminum→Aluminum IngotMalformed Ingot11.25 s12,741 HU1,30020.95Aluminum
Crushed Copper→Copper IngotMalformed Ingot30 s4,320 HU8001Copper
Copper Dust→Copper IngotMalformed Ingot10 s2,880 HUNo800Copper
Crushed Gold→Gold IngotMalformed Ingot30 s5,164 HU1,0002Gold
Gold Dust→Gold IngotMalformed Ingot10 s3,443 HU1,000Gold
Crushed Iron→Iron IngotMalformed Ingot30 s4,320 HU8001Iron
Iron Dust→Iron IngotMalformed Ingot10 s2,880 HUNo800Iron
Crushed Lead→Lead IngotMalformed Ingot15 s5,573 HU1,10030.95Lead
Lead Dust→Lead IngotMalformed Ingot5 s3,716 HU1,1000.95Lead
Lead OreDeepslate Lead Ore→Lead IngotMalformed Ingot7.5 s5,573 HU1,10030.95Lead
Raw Lead→Lead IngotMalformed Ingot7.5 s5,573 HU1,10020.95Lead
Crushed Naquadah→Naquadah IngotMalformed Ingot120 s107,899 HU2,00081.05Naquadah
Naquadah Dust→Naquadah IngotMalformed Ingot40 s71,933 HU2,0001.05Naquadah
Naquadah OreDeepslate Naquadah Ore→Naquadah IngotMalformed Ingot60 s107,899 HU2,00081.05Naquadah
Raw Naquadah→Naquadah IngotMalformed Ingot60 s107,899 HU2,00021.05Naquadah
Crushed Netherite→Netherite IngotMalformed Ingot90 s107,899 HU2,00081.05Netherite
Netherite Dust→Netherite IngotMalformed Ingot30 s71,933 HU2,0001.05Netherite
Crushed Nickel→Nickel IngotMalformed Ingot37.5 s5,573 HU1,10030.95Nickel
Nickel Dust→Nickel IngotMalformed Ingot12.5 s3,716 HU1,1000.95Nickel
Nickel OreDeepslate Nickel Ore→Nickel IngotMalformed Ingot18.75 s5,573 HU1,10030.95Nickel
Raw Nickel→Nickel IngotMalformed Ingot18.75 s5,573 HU1,10020.95Nickel
Crushed Osmium→Osmium IngotMalformed Ingot75 s12,741 HU1,30040.95Osmium
Osmium Dust→Osmium IngotMalformed Ingot25 s8,494 HU1,3000.95Osmium
Osmium OreDeepslate Osmium Ore→Osmium IngotMalformed Ingot37.5 s12,741 HU1,30040.95Osmium
Raw Osmium→Osmium IngotMalformed Ingot37.5 s12,741 HU1,30020.95Osmium
Crushed Platinum→Platinum IngotMalformed Ingot45 s64,645 HU1,75061Platinum
Platinum Dust→Platinum IngotMalformed Ingot15 s43,096 HU1,7501Platinum
Platinum OreDeepslate Platinum Ore→Platinum IngotMalformed Ingot22.5 s64,645 HU1,75061Platinum
Raw Platinum→Platinum IngotMalformed Ingot22.5 s64,645 HU1,75021Platinum
Crushed Silver→Silver IngotMalformed Ingot30 s5,573 HU1,10030.95Silver
Silver Dust→Silver IngotMalformed Ingot10 s3,716 HU1,1000.95Silver
Silver OreDeepslate Silver Ore→Silver IngotMalformed Ingot15 s5,573 HU1,10030.95Silver
Raw Silver→Silver IngotMalformed Ingot15 s5,573 HU1,10020.95Silver
Crushed Tin→Tin IngotMalformed Ingot15 s5,164 HU1,0002Tin
Tin Dust→Tin IngotMalformed Ingot5 s3,443 HUNo1,000Tin
Tin OreDeepslate Tin Ore→Tin IngotMalformed Ingot7.5 s5,164 HU1,0002Tin
Raw Tin→Tin IngotMalformed Ingot7.5 s5,164 HU1,0002Tin
Crushed Titanium→Titanium IngotMalformed Ingot90 s20,856 HU1,45051Titanium
Titanium Dust→Titanium IngotMalformed Ingot30 s13,904 HU1,4501Titanium
Titanium OreDeepslate Titanium Ore→Titanium IngotMalformed Ingot45 s20,856 HU1,45051Titanium
Raw Titanium→Titanium IngotMalformed Ingot45 s20,856 HU1,45021Titanium
Crushed Tungsten→Tungsten IngotMalformed Ingot120 s64,645 HU1,75061Tungsten
Tungsten Dust→Tungsten IngotMalformed Ingot40 s43,096 HU1,7501Tungsten
Tungsten OreDeepslate Tungsten Ore→Tungsten IngotMalformed Ingot60 s64,645 HU1,75061Tungsten
Raw Tungsten→Tungsten IngotMalformed Ingot60 s64,645 HU1,75021Tungsten
Crushed Zinc→Zinc IngotMalformed Ingot22.5 s5,164 HU1,0002Zinc
Zinc Dust→Zinc IngotMalformed Ingot7.5 s3,443 HU1,000Zinc
Zinc OreDeepslate Zinc Ore→Zinc IngotMalformed Ingot11.25 s5,164 HU1,0002Zinc
Raw Zinc→Zinc IngotMalformed Ingot11.25 s5,164 HU1,0002Zinc
Resin→Rubber10 s2,880 HU
Saturated Silica Gel Beads→Silica Gel BeadsAsh60 s17,280 HUNo120
Saturated Supercharged Silica Gel Beads→Supercharged Silica Gel BeadsAsh120 s34,560 HUNo120
Potato→Baked Potato10 s2,880 HU
Black Terracotta→Black Glazed Terracotta10 s2,880 HU
Blue Terracotta→Blue Glazed Terracotta10 s2,880 HU
Clay Ball→Brick10 s2,880 HU
Brown Terracotta→Brown Glazed Terracotta10 s2,880 HU
Dark Oak LogDark Oak WoodStripped Dark Oak LogStripped Dark Oak WoodOak LogOak WoodStripped Oak LogStripped Oak WoodAcacia LogAcacia WoodStripped Acacia LogStripped Acacia WoodBirch LogBirch WoodStripped Birch LogStripped Birch WoodJungle LogJungle WoodStripped Jungle LogStripped Jungle WoodSpruce LogSpruce WoodStripped Spruce LogStripped Spruce WoodMangrove LogMangrove WoodStripped Mangrove LogStripped Mangrove WoodCherry LogCherry WoodStripped Cherry LogStripped Cherry Wood→Charcoal10 s2,880 HU
Coal Ore→Coal10 s2,880 HU1
Deepslate Coal Ore→Coal10 s2,880 HU1
Raw Beef→Steak10 s2,880 HU
Raw Chicken→Cooked Chicken10 s2,880 HU
Raw Cod→Cooked Cod10 s2,880 HU
Raw Mutton→Cooked Mutton10 s2,880 HU
Raw Porkchop→Cooked Porkchop10 s2,880 HU
Raw Rabbit→Cooked Rabbit10 s2,880 HU
Raw Salmon→Cooked Salmon10 s2,880 HU
Copper Ore→Copper IngotMalformed Ingot10 s2,880 HU8001Copper
Deepslate Copper Ore→Copper IngotMalformed Ingot10 s2,880 HU8001Copper
Raw Copper→Copper IngotMalformed Ingot10 s2,880 HU8001Copper
Deepslate Bricks→Cracked Deepslate Bricks10 s2,880 HU
Deepslate Tiles→Cracked Deepslate Tiles10 s2,880 HU
Nether Bricks→Cracked Nether Bricks10 s2,880 HU
Polished Blackstone Bricks→Cracked Polished Blackstone Bricks10 s2,880 HU
Stone Bricks→Cracked Stone Bricks10 s2,880 HU
Cyan Terracotta→Cyan Glazed Terracotta10 s2,880 HU
Cobbled Deepslate→Deepslate10 s2,880 HU
Deepslate Diamond Ore→Diamond10 s2,880 HU1
Diamond Ore→Diamond10 s2,880 HU1
Kelp→Dried Kelp10 s2,880 HU
Deepslate Emerald Ore→Emerald10 s2,880 HU1
Emerald Ore→Emerald10 s2,880 HU1
SandRed Sand→Glass10 s2,880 HU
Deepslate Gold Ore→Gold IngotMalformed Ingot10 s3,443 HU1,0002Gold
Gold Ore→Gold IngotMalformed Ingot10 s3,443 HU1,0002Gold
Nether Gold Ore→Gold IngotMalformed Ingot10 s3,443 HU1,0002Gold
Raw Gold→Gold IngotMalformed Ingot10 s3,443 HU1,0002Gold
Golden PickaxeGolden ShovelGolden AxeGolden HoeGolden SwordGolden HelmetGolden ChestplateGolden LeggingsGolden BootsGolden Horse Armor→Gold Nugget10 s2,880 HU
Gray Terracotta→Gray Glazed Terracotta10 s2,880 HU
Cactus→Green Dye10 s2,880 HU
Green Terracotta→Green Glazed Terracotta10 s2,880 HU
Deepslate Iron Ore→Iron IngotMalformed Ingot10 s2,880 HU8001Iron
Iron Ore→Iron IngotMalformed Ingot10 s2,880 HU8001Iron
Raw Iron→Iron IngotMalformed Ingot10 s2,880 HU8001Iron
Iron PickaxeIron ShovelIron AxeIron HoeIron SwordIron HelmetIron ChestplateIron LeggingsIron BootsIron Horse ArmorChainmail HelmetChainmail ChestplateChainmail LeggingsChainmail Boots→Iron Nugget10 s2,880 HU
Deepslate Lapis Lazuli Ore→Lapis Lazuli10 s2,880 HU1
Lapis Lazuli Ore→Lapis Lazuli10 s2,880 HU1
Light Blue Terracotta→Light Blue Glazed Terracotta10 s2,880 HU
Light Gray Terracotta→Light Gray Glazed Terracotta10 s2,880 HU
Sea Pickle→Lime Dye10 s2,880 HU
Lime Terracotta→Lime Glazed Terracotta10 s2,880 HU
Magenta Terracotta→Magenta Glazed Terracotta10 s2,880 HU
Netherrack→Nether Brick10 s2,880 HU
Ancient Debris→Netherite Scrap10 s11,989 HU2,00081.05
Orange Terracotta→Orange Glazed Terracotta10 s2,880 HU
Pink Terracotta→Pink Glazed Terracotta10 s2,880 HU
Chorus Fruit→Popped Chorus Fruit10 s2,880 HU
Purple Terracotta→Purple Glazed Terracotta10 s2,880 HU
Nether Quartz Ore→Nether Quartz10 s2,880 HU1
Red Terracotta→Red Glazed Terracotta10 s2,880 HU
Deepslate Redstone Ore→Redstone Dust10 s2,880 HU1
Redstone Ore→Redstone Dust10 s2,880 HU1
Basalt→Smooth Basalt10 s2,880 HU
Block of Quartz→Smooth Quartz Block10 s2,880 HU
Red Sandstone→Smooth Red Sandstone10 s2,880 HU
Sandstone→Smooth Sandstone10 s2,880 HU
Stone→Smooth Stone10 s2,880 HU
Wet Sponge→Sponge10 s2,880 HU
Cobblestone→Stone10 s2,880 HU
Clay→Terracotta10 s2,880 HU
White Terracotta→White Glazed Terracotta10 s2,880 HU
Yellow Terracotta→Yellow Glazed Terracotta10 s2,880 HU

Ascendancy trees

Every node in this machine's ascendancies. See Machine Mastery for how Seals and points work.

Crucible Keeper

Node Type After Effect
Overdrive Lanes Root — +1% Overdrive Speed; +30% Overdrive Cap.
Hotter Lanes Small Overdrive Lanes +5% Overdrive Cap.
Superheat Notable Hotter Lanes +15% Overdrive Cap.
Deep Draft Small Superheat 10% increased Heat Transfer.
Crucible Heart Deep notable Deep Draft +1 Batch Size while a lane runs at twice the recipe target or hotter.
Banked Coals Small Overdrive Lanes 10% increased Heat Insulation.
Hold the Fire Notable Banked Coals A lane does not cool while its input slot holds a smeltable input.
Watchful Gauge Small Overdrive Lanes +10 °C Overdrive Margin.
Safe Margin Notable Watchful Gauge +15 °C Overdrive Margin. The overheat slider stops at the recipe’s safe maximum, and wobble never spikes past the overheat temperature.
Steady Hands Small Safe Margin +2 Strain Recovery.
Strain Bleed Deep notable Steady Hands +10 Strain Recovery.
Stoked Hearth Small Overdrive Lanes 4% increased Max Temperature.
Shared Hearth Notable Stoked Hearth Each load dip is split across every lane that is smelting.

Bloomer

Node Type After Effect
Bloom Ledger Root — +11.11% Ledger Rate; 50% less Super Output.
Rich Ore Small Bloom Ledger 10% increased Ledger Rate.
Rich Blooms Notable Rich Ore 100% increased Ledger Rate.
Slow Growth Small Rich Blooms 10% increased Ledger Rate.
Patient Bloom Deep notable Slow Growth 50% more Ledger Rate; 30% less Processing Speed.
Flux Bed Small Bloom Ledger 8% increased Temperature Stability.
Fluxed Blend Notable Flux Bed Blend smelts need 100 °C less.
Skimmed Slag Small Bloom Ledger 8% increased Temperature Stability.
Slag Reclaim Notable Skimmed Slag Malformed-ingot recovery takes half the time and half the FE.
Clean Pour Small Slag Reclaim 8% increased Temperature Stability.
Clean Bloom Deep notable Clean Pour Ore, raw, and crushed smelts never produce failure outputs. Low stability pauses the lane instead.
Fed Line Small Bloom Ledger 10% increased Ledger Rate.
Crusher Line Notable Fed Line Crushed inputs feed the Bloom Ledger twice.

Screen

The Furnace screen has five tabs:

  • Process: input and output lanes, live heat, failure strain, and energy or fuel. Electric stages add the Nitrogen gauge at the right edge. Hover for exact temperatures. Hover a lane's progress bar for its time remaining and expected items per minute with your Gear and Mastery applied (chance bonuses such as Super Output are not counted).
  • Gear: Heat Core and Battery Cell slots.
  • Stats: the machine's current stats, including traits, Gear, and Mastery.
  • Refinement: refine the placed Furnace's traits with a catalyst.
  • Mastery: machine XP, level, and the passive tree.

Data values

NameResource locationFormTranslation key
Furnacerngtech:furnaceBlockblock.rngtech.furnace
Iron Furnace Chassisrngtech:iron_furnace_chassisBlockblock.rngtech.iron_furnace_chassis
Copper Furnace Chassisrngtech:copper_furnace_chassisBlockblock.rngtech.copper_furnace_chassis
Bronze Furnace Chassisrngtech:bronze_furnace_chassisBlockblock.rngtech.bronze_furnace_chassis
Steel Furnace Chassisrngtech:steel_furnace_chassisBlockblock.rngtech.steel_furnace_chassis
Lead Furnace Chassisrngtech:lead_furnace_chassisBlockblock.rngtech.lead_furnace_chassis
Aluminum Furnace Chassisrngtech:aluminum_furnace_chassisBlockblock.rngtech.aluminum_furnace_chassis
Titanium Furnace Chassisrngtech:titanium_furnace_chassisBlockblock.rngtech.titanium_furnace_chassis
Tungstensteel Furnace Chassisrngtech:tungstensteel_furnace_chassisBlockblock.rngtech.tungstensteel_furnace_chassis
Exotic Furnace Chassisrngtech:exotic_furnace_chassisBlockblock.rngtech.exotic_furnace_chassis

See also

RNGTech wiki
GuidesAutomation · Battery Cells · Dormant Machines · Gear · Getting Started · Heat · Machine Mastery · Machine Stats · Modpack Creators · Power Chains · Rarity and Affixes · Stages · Uniques
ProcessingAlloy Furnace · Component Assembler · Component Recycler · Crusher · Furnace · Melter · Metal Press · Resonance Calibrator · Wooden Composter
Power generationBio Generator · Cavitation Generator · Corrosion Cell · Fuel Cell · Potential Reactor · Solar Panel · Solid Fuel Burner · Syngas Combustor · Vacuum Collapse Generator
Energy storageBattery Chassis
Fluids and gasesAlgae Photobioreactor · Ammonia Synthesizer · Coal Gasifier · Fluid and Compressor Tanks · Silica Gel Dehumidifier · Steam Methane Reformer · Wooden Dehumidifier
RefinementAffix Forge · Exotic Affix Forge
LogisticsUniversal Cable
ToolsForestry Cart Station · Miner's Companion · Modular Tools · Tool Bench