how to use furnace stardew valley

The Furnace smelts ore into bars, which are used in several crafting recipes.

Clint gives you the blueprint for the Furnace in a cutscene the morning after you collect at least 1 Copper Ore. You must exit your house between 6am and 11:30am to trigger the cutscene. (Note that you can get the Copper Ore from anywhere, including from a fishing chest or from purchasing it from Clint directly. You do not have to drop the ore on the ground to trigger the cutscene.)

If you have not yet met Clint when he comes to give you the blueprint, the meeting will count as an introduction.

A furnace is the reward for completing the Blacksmith's Bundle in the Boiler Room.

A furnace is used to change a Bouquet into a Wilted Bouquet.

The furnace will occasionally make the same sound as placing down wallpaper or flooring

Smelting

To smelt any ore (or Bouquet), equip it and activate the furnace while there is Coal in your inventory. One unit of Coal is required for each smelting operation, regardless of the material or duration.

Input	Output	Time to smelt	Sells For
Bouquet (1)	Wilted Bouquet (1)	≤10 minutes	100g
Copper Ore (5)	Copper Bar (1)	0.5 hours	60g
Quartz (1)	Refined Quartz (1)	1.5 hours	50g
Fire Quartz (1)	Refined Quartz (3)	1.5 hours	50g (x3)
Iron Ore (5)	Iron Bar (1)	2 hours	120g
Gold Ore (5)	Gold Bar (1)	5 hours	250g
Iridium Ore (5)	Iridium Bar (1)	8 hours	1,000g
Radioactive Ore (5)	Radioactive Bar (1)	10 hours	3,000g

Furnaces outside the farm

It is possible to place chests and other crafted items outside the farm. Chests are useful for storing gifts close to the homes of Villagers who prefer them or to allow additional storage when Mining, Fishing, or Foraging. Worm Bins can be placed near fishing spots, Furnaces can be placed at the entrance to The Mines, and entire sections of the Valley may be utilized for Keg or Preserves Jar processing. Common Trees can be planted in tillable soil and tapped.

If a villager walks through the square where a crafted item was placed, the item will be destroyed. Below are player-created maps to indicate which tiles on the map are safe from villager-pathing. The tiles with the Rotten Plant should be safe.

Safe-pathing images of the interiors of homes and buildings can be found in the complete image gallery located at https://imgur.com/a/JlRXGlc

Note that items placed on the docks at the beach may be destroyed by villagers during the Dance of the Moonlight Jellies. The image below is accurate for players who do not attend the festival.

History

1.0: Introduced.
1.3.27: Added ability to smelt Fire Quartz.
1.4: Added ability to craft Wilted Bouquet from Bouquet. Furnaces can now be stacked in a player's inventory and in chests. You no longer have to drop ore on the ground to trigger the Clint cutscene.
1.5: Added Radioactive Ore and Bar.

Equipment
Artisan		Bee House • Cask • Cheese Press • Keg • Loom • Mayonnaise Machine • Oil Maker • Preserves Jar
Refining		Bone Mill • Charcoal Kiln • Crystalarium • Furnace • Geode Crusher • Heavy Tapper • Lightning Rod • Ostrich Incubator • Recycling Machine • Seed Maker • Slime Egg-Press • Slime Incubator • Solar Panel • Tapper • Wood Chipper • Worm Bin
Farming	Fertilizer	Basic Fertilizer • Basic Retaining Soil • Deluxe Fertilizer • Deluxe Retaining Soil • Deluxe Speed-Gro • Hyper Speed-Gro • Quality Fertilizer • Quality Retaining Soil • Speed-Gro • Tree Fertilizer
	Sprinklers	Iridium Sprinkler • Quality Sprinkler • Sprinkler
	Other	Deluxe Scarecrow • Garden Pot • Rarecrow • Scarecrow
Fishing	Bait	Bait • Magic Bait • Magnet • Wild Bait
	Tackle	Barbed Hook • Cork Bobber • Curiosity Lure • Dressed Spinner • Lead Bobber • Quality Bobber • Spinner • Trap Bobber • Treasure Hunter
	Other	Crab Pot
Bombs		Bomb • Cherry Bomb • Mega Bomb
Fences		Gate • Hardwood Fence • Iron Fence • Stone Fence • Wood Fence
Storage		Chest • Junimo Chest • Mini-Fridge • Stone Chest
Signs		Dark Sign • Stone Sign • Wood Sign
Misc		Coffee Maker • Cookout Kit • Deconstructor • Fairy Dust • Farm Computer • Hopper • Mini-Jukebox • Sewing Machine • Staircase • Telephone • Tools • Workbench