Tried to make a burner email account to upload the PDF but Google thought I was a bot, sorry about that.
Managed to take this screenshot of it. You'll have to open the image in a new tab because of how small it is.
There will probably be an electrical furnace either in the next update or shortly after via mods (as the developer has stated they'll probably release the source code for the game).
But going back to the issue you're having there is a way to make it work (it's a little complicated). I will probably show the blueprint of how to do it shortly.