Better Furnaces Upgrade System

Upgraded furnaces in Better Furnaces accept up to three upgrades applied to a single furnace, letting players tailor a furnace to their needs. Upgrades fall into three broad categories.

Efficiency Upgrades

• Fuel Efficiency: Doubles fuel usage efficiency, up to a limit of 128 items.
• Advanced Fuel Efficiency: Doubles fuel usage efficiency with no item limit.

Processing Upgrades

• Ore Processing: Doubles ore output, up to a limit of 512 items.
• Advanced Ore Processing: Doubles ore output with no limit.

Functional Upgrades

• Storage: Adds 2 extra fuel slots and 2 extra input slots.
• Liquid Fuel: Adds an internal tank so the furnace can smelt using lava.
• Input Factory: Specifies an adjacent inventory to pull input items from.
• Output Factory: Specifies an adjacent inventory to push finished items to.
• Factory: A combined upgrade providing input, output, and fuel control together.
• Color: Allows customizing the furnace's color; configured by shift right-clicking with the upgrade.

By combining efficiency, processing, and functional upgrades, players can build furnaces that burn fuel more economically, yield bonus materials from ores, and operate automatically as part of an item-handling system.