Heavy Furnace

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This page or section contains unmarked spoilers from update 1.6 of Stardew Valley. Players may want to avoid or be cautious toward reading this article/section.

Heavy Furnace
Heavy Furnace.png   Heavy Furnace On.png
It's more efficient than a regular furnace. Requires 25 pieces of ore and 3 coal per use.
Source Crafting
Sell Price Cannot be sold
Recipe Source Mining Skill Icon.png Mining Mastery
Ingredients Furnace.png Furnace (2)Iron Bar.png Iron Bar (3)Stone.png Stone (50)

The Heavy Furnace is an improved version of the Furnace. It can be crafted after claiming Mining Mastery. It takes 25 ores (or 5 quartz or fire quartz) and 3 Coal to run.


To smelt any ore, equip it and activate the furnace while there is Coal in inventory. Three units of Coal are required for each smelting operation, regardless of the material or duration. Each possible output stack size is equally likely, i.e. ores have a 50% chance of yielding 5 bars and a 50% chance of yielding 6 bars.[1]

When 5 bars are produced, the Heavy Furnace saves 40% Coal in comparison to normal Furnaces. When 6 bars are produced, 50% of the Coal and one sixth of the ore is saved in comparison to normal Furnaces.

Input Output Time to smelt Sells For (Unit) Sells For (Average total)
Bouquet.png Bouquet (1) Wilted Bouquet.png Wilted Bouquet (1) Time Icon.png ≤10m data-sort-value="100">Gold.png100g
Copper Ore.png Copper Ore (25) Copper Bar.png Copper Bar (5-6) Time Icon.png 30m data-sort-value="60">Gold.png60g data-sort-value="330">Gold.png330g
Quartz.png Quartz (5) Refined Quartz.png Refined Quartz (5-6) Time Icon.png 90m (1h 30m) data-sort-value="50">Gold.png50g data-sort-value="275">Gold.png275g
Fire Quartz.png Fire Quartz (5) Refined Quartz.png Refined Quartz (15-20) Time Icon.png 90m (1h 30m) data-sort-value="50">Gold.png50g data-sort-value="875">Gold.png875g
Iron Ore.png Iron Ore (25) Iron Bar.png Iron Bar (5-6) Time Icon.png 120m (2h) data-sort-value="120">Gold.png120g data-sort-value="660">Gold.png660g
Gold Ore.png Gold Ore (25) Gold Bar.png Gold Bar (5-6) Time Icon.png 300m (5h) data-sort-value="250">Gold.png250g data-sort-value="1375">Gold.png1,375g
Iridium Ore.png Iridium Ore (25) Iridium Bar.png Iridium Bar (5-6) Time Icon.png 480m (8h) data-sort-value="1000">Gold.png1,000g data-sort-value="5500">Gold.png5,500g
Radioactive Ore.png Radioactive Ore (25) Radioactive Bar.png Radioactive Bar (5-6) Time Icon.png 560m (9h 20m) data-sort-value="3000">Gold.png3,000g data-sort-value="16500">Gold.png16,500g


  1. See Data/Machines.xnb in the game files. The output size is chosen using MinStack and MaxStack, which are not affected by any modifiers.


  • 1.6: Introduced.