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For more information, see the crafting grid guide.
The Hearth Coil is a multiblock structure added by Embers. When placed, it forms a 3x3x1 multiblock structure, centered on where the Hearth Coil is placed. It functions as a furnace that accepts Ember power. When supplied with power through a Mechanical Core attached to the bottom of the machine, it will heat up and process any items that are dropped on its top face. Finished products may be piped out using an Item Extractor and Item Pipes. The longer the Hearth Coil spends heating up the faster it will process items.