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Eternal Furnace

Eternal Furnace

Craft Hellfire Netherrack, place it under a Furnace, and get infinite fuel forever — no more hauling coal. The catch: it smelts 1.8x slower. Gives Netherrack a real purpose.

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Eternal Furnace

Give Netherrack a new purpose.

Craft Hellfire Netherrack, place it directly beneath a regular Furnace, and the Furnace gains infinite fuel — no coal, charcoal, lava buckets, or other fuel required.

The trade-off is speed: when powered by Hellfire, smelting takes 1.8× longer than normal.

How it works

Combine Flint and Steel + Netherrack to craft Hellfire Netherrack.

Place Hellfire Netherrack directly underneath a regular Furnace and add something to smelt. The fuel slot can remain completely empty.

Normal Furnace Hellfire Furnace
Fuel Consumes normal fuel Infinite
Standard smelting time ~10 seconds ~18 seconds
Fuel slot required Yes No

The slowdown is based on the recipe's normal cooking time, so recipes with custom smelting times are supported as well.

Features

  • New block: Hellfire Netherrack
  • Simple recipe: Flint and Steel + Netherrack
  • Infinite Furnace fuel
  • Balanced by 1.8× longer smelting time
  • Existing normal fuel is never discarded when Hellfire is placed beneath an already-burning Furnace
  • Remove Hellfire and the Furnace returns to normal vanilla behavior
  • Works only with the regular vanilla Furnace
  • Smokers and Blast Furnaces are intentionally unaffected
  • Supports recipes with custom cooking times
  • Works in both singleplayer and multiplayer

Installation

  1. Install Minecraft Forge 47.x for Minecraft 1.20.1.
  2. Download Eternal Furnace.
  3. Place the .jar file into your mods folder.
  4. Launch Minecraft.

Requirements

  • Minecraft 1.20.1
  • Forge 47.x
  • Java 17

License

Eternal Furnace is licensed under the MIT License.

Copyright © 2026 veizakn1