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Ultimate FurnaceMinecraft mod for 1.21.5

The Ultimate Furnace Mod adds a fuel-free, solar-powered furnace that levels up to smelt faster and store more energy. At night, it uses stored power. The mod also adds the Copper Plate Block, which reacts to temperature.

client and servernewest supported 1.21.5TechnologyUtilityEconomyDecoration
Latest version
1.3.3-1.21.0-1
Minecraft
1.19.2 to 1.21.5
Java
Java 21+
Loaders
Quilt, Fabric
Licence
LicenseRef-All-Rights-Reserved
Downloads
6.8k
Updated
3 mo ago
Available on
Modrinth
Space NodeOur hosting

Host Ultimate Furnace servers

One click and Ultimate Furnace is installed with the right loader, on hardware built for it.

  • 1.21.5
  • Quilt
  • Fabric
  • One click mod install
  • Loader matched for you
  • Ryzen CPUs
  • NVMe SSD
Deploy a serverFrom €0.90 per GB

Screenshots

Click a screenshot to open it. Screenshots are served from the author’s own host and belong to them.

Minecraft versions

Every version Ultimate Furnace declares support for, newest first, with the Java runtime that version needs.

Other mods
MinecraftThroughJavaEvidenceReleased
1.21.5Quilt, Fabric21+declared25 Mar 2025
1.21.4Quilt, Fabric21+declared3 Dec 2024
1.21.3Fabric, Quilt21+declared23 Oct 2024
1.21.2Quilt, Fabric21+declared22 Oct 2024
1.21.1Quilt, Fabric21+declared8 Aug 2024
1.21Quilt, Fabric21+declared13 Jun 2024
1.19.2Fabric, Quilt17+declared5 Aug 2022

Download

From Ultimate Furnace’s own host. Nothing is re-hosted here.

1.3.3-1.21.0-1release10 Nov 2025

ultimate_furnace-1.3.3-1.21.0-1.jar · 97 KB · for 1.21.1, 1.21

Download latest
ee9bf48ad66f…
Older versions11
  • 1.3.3-1.21.2-410 Nov 20251.21.4, 1.21.3, 1.21.297 KB161 downloadsd867f1a2695a…Get
  • 1.3.2-1.21.513 May 20251.21.585 KB894 downloads95c6c6c54a68…Get
  • 1.3.1-1.21.52 May 20251.21.584 KB162 downloadse436f89d22af…Get
  • 1.3.1-1.21.0-11 May 20251.21.1, 1.2183 KB1.4k downloads197087ec77f3…Get
  • 1.3.1-1.21.2-410 Mar 20251.21.4, 1.21.3, 1.21.284 KB677 downloadsb1eae6820d1d…Get
  • 1.3.0-1.21.2-410 Dec 20241.21.4, 1.21.3, 1.21.284 KB756 downloadsce76624e554e…Get
  • 1.2.3-1.21.2-410 Dec 20241.21.3, 1.21.283 KB51 downloadsaed6862466c4…Get
  • 1.2.2-1.21.2-310 Dec 20241.21.3, 1.21.283 KB59 downloads144632c4e927…Get
  • 1.2.1-1.21.39 Dec 20241.21.383 KB61 downloads0d96f71500ac…Get
  • 1.1.1-1.21.0-120 Nov 20241.21.1, 1.2164 KB1.3k downloadsa8037d2c13df…Get
  • 1.0-1.19.228 Oct 20241.19.256 KB129 downloads85b804b8ba09…Get

Frequently asked

Does Ultimate Furnace work on Minecraft 1.21.5?

Yes. 1.21.5 is the newest Minecraft version Ultimate Furnace declares support for, and the claim comes from the author's own release metadata rather than from a compatibility list somebody maintains by hand.

Which Minecraft versions does Ultimate Furnace support?

Everything the author has declared, from 1.19.2 up to 1.21.5. The full list is in the table above, with the Java runtime each version needs next to it.

Do I need to install Ultimate Furnace on the client or the server?

Both. Every player needs it installed and so does the server, so anyone joining without it will be refused.

Which platform or loader does Ultimate Furnace support?

Quilt, Fabric. A build for one platform or loader will not necessarily load on another, so this is the first thing to check before the Minecraft version.

Which Java version do I need for Ultimate Furnace?

On the newest Minecraft version it supports, Java 21 or newer. The requirement comes from the Minecraft version you run rather than from the mod itself, so on an older supported Minecraft the answer is that version's Java, not this one.

What licence is Ultimate Furnace under?

LicenseRef-All-Rights-Reserved, as stated by the author on the platform we synced it from. Check the project's own page before redistributing or bundling it.

How do I install Ultimate Furnace?

Install the matching loader first, then put the downloaded file in your mods folder and start the game. The loader, the mod and Minecraft all have to be on the same version, which is the usual reason a mod does not appear in game.

Where do I download Ultimate Furnace safely?

Start with the author's page on Modrinth, which is where the data here is synced from. MCReference does not host or repackage files. The download link goes to the source recorded for that release; verify the publisher, filename and checksum before running it.

Works on the same versions

Ordered by how much of the recent Minecraft version coverage overlaps, not by popularity.

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Details from Modrinth, where the author last updated it on 15 Jul 2026. We do not host files and we do not republish descriptions; every download link points at the author’s own release.

Is this information wrong or missing something? .