Why you'd want one
The Industrial Oven's primary advantage over the stock Furnace is one of efficiency. Instead of being able to smelt one item at a single time, up to nine items can be smelt simultaneously, which is a large advantage when producing items at scale later on in Polycraft. In other words, a single Industrial Oven does the work of nine Furnaces.
What you'll need
How to make it
Start things off by distilling your crude oil. You should be left with a little over 2 beakers worth of Naphthalene, among other things. You'll then want to distill 2 beakers of that into about 1 beaker of Light Naphtha, which you then distill again. When you're finished, you should have 8 vials of Light Parrafins. Go ahead and distill all 8 vials, which will give you 7 flasks of Methane and 1 flask of Ethane.
During any time in the distillation process, you can craft the Copper Ingots into Copper Pipe:
Or the Cobblestone into 3 Furnaces:
Once you've done this, you'll have all the items needed to craft an Industrial Oven. Head over to your Crafting Table and arrange the items like so to make an Industrial Oven: