Furnace

The Furnace converts gathered ingredients into processed materials. Its job extends beyond silver: the older entry includes bars, glass, lenses, and light bulbs. The Clay discovery condition and construction cost describe the historical base machine, while later tiers change its automation connections. Input and output ports matter when designing a line: a machine that accepts ingredients through a pipe does not automatically have the output capability listed for a higher tier. Version 1.0 adds Furnace III and changes construct progression, so a legacy Milestone 4 label is not a complete current unlock table. Follow the actual ingredient chain for the material you need rather than treating every ore as the same smelting recipe.

Acquisition and published details

The item and progression fields below are historical 0.8 wiki data; changes explicitly described in the 1.0 release notes are identified separately.

Obtaining it: Discover Clay to unlock the recipe, then build it from the construction menu.

Main use: Bronze/Iron/Silver/Steel Bars, Clear Glass, lenses and light bulbs.

category: Processing / Crafting Station. recipe: 12 Wood + 12 Clay. milestone: 4: Bronze Technology & Commerce. power: None. input: Yes (automation). output: No (Furnace II adds output). effect: Smelts ores, sand and clay into bars, glass and lenses; small chance of a duplicate output. version change: 1.0 adds Furnace III and rebalances construct tiers.