Iron Smelters
The Iron Smelters package adds a complete line of improved furnaces and stoves crafted from various metals. You'll get models made from copper, iron, gold, diamonds, and even obsidian!
Each equipment type works significantly faster than regular vanilla counterparts. Moreover, the higher the material level - the faster the processing speed becomes. All time parameters can be flexibly configured through the mod's configuration files.

A distinctive feature of the mod is the sequential upgrade system - special upgrade items allow transforming a low-level furnace into a more advanced version without the need to break and recreate the entire block.
The idea for creating Iron Smelters was inspired by the popular Iron Chests package by CPW, which is also recommended for installation.