Fust Survival Furnace Guide: Smelting, Fuel and Charcoal

On a 10x server, one Furnace costs 200 Wood, 400 Stones and 100 Cloth and takes 3 seconds to craft. Each Furnace has its own cost, so two require twice those materials.

1. Open CRAFTING, select Furnace, choose the quantity and select CRAFT.
2. Put the finished Furnace on your hotbar and place it inside your base. You can place two side by side.
3. Face the Furnace and press E to open it.

For help with the crafting menu and queue, see the crafting and workbench guide.

The Furnace interface has a FUEL slot, two ORE / FOOD slots and three OUTPUT slots. Its resource list includes Wood, Metal Ore, Sulfur Ore, HQM Ore and Raw Meat.

1. Use +50 or +ALL beside Wood to load fuel.
2. Use the controls beside your ore to load it into the ORE / FOOD slots. Metal Ore can be smelted into Metal Fragments.
3. Select LIGHT to start the Furnace.
4. Collect processed materials using the individual TAKE controls or TAKE ALL.

Coal is another Furnace fuel; the Wood rate below applies to Wood, not Coal.

On the 10x-server Furnace interface, Wood burns at 1 Wood per second, and each ore slot processes 1 ore per second. With ore in both slots, the combined rate is 2 ores per second while both remain supplied. Split a batch as evenly as possible so one slot does not sit idle for much of the run.

For whole ore counts already loaded in the two slots, estimate the processing time as max(n1, n2) seconds, where n1 and n2 are the amounts in each slot. At the displayed Wood rate, that processing interval uses the same number of Wood. For N ores split as evenly as possible, the estimate is ceil(N / 2) seconds and ceil(N / 2) Wood.

For example, 100 ore split 50 and 50 takes an estimated 50 seconds and 50 Wood. Putting all 100 in one slot takes an estimated 100 seconds and 100 Wood. These estimates assume enough fuel and output space, uninterrupted processing, and no extra burning before or after the batch.

A lit Furnace can burn Wood and produce Charcoal even when both ore slots are empty. This is useful when you need Charcoal, but it also consumes Wood after an ore batch finishes. The 10x Furnace interface lists 75% Charcoal production; that figure does not directly guarantee a specific number of Charcoal pieces.

Combine Charcoal with Sulfur to craft Gunpowder. See the ammo guide for its use in ammunition.

Face a Large Furnace and press E at the OPEN prompt. Its status display on a 10x server shows a maximum of 1,500 HP. For explosive costs and planning a breach, see the raiding guide.