Code copied from: https://mods.factorio.com/mod/electric-furnaces-space-exploration-fix
Thumnail imange from: https://mods.factorio.com/mod/Early-3x3-Electric-Furnaces

this mod adds kiln recipes to 3x3 early furnaces.

Also edit energy consumption value to 150kW. upgrading primitive furnace gives you higher crafting speed, and upgrading basic gives you 2 module slots.