Furnace

The Furnace is the fourth type of machine in the Machines menu. It smelts an ore to liquid. If a non-basic resource (a basic resource refers to ores produced in starter) is put into the furnace, it will output the item without smelting it.

The pop-up upon tapping on the furnace shows the item(s) to be processed and processing.

It costs 10,000 dollars to build

Upgrades
A furnace can operate at an electricity cost of $5 per use and smelts an item every 3 seconds.

The electricity cost can be upgraded, reducing the cost to $1 per use, while the smelting time can be upgraded, reducing it to 1 second per item.