Heater

Heater is a Fabric mod with three new blocks: the namesake Heater, a Heat Pipe, and a Thermostat, and each of the three has weathered and waxed versions. A Heater looks like a normal furnace at first glance and even opens a similar screen, but it has no item slots because it does not process anything. Instead, fuel placed in it burns and the heat it produces powers nearby blocks, including Furnaces, Blast Furnaces, Smokers and other machines that consume fuel.

Heat Pipes carry heat through their length, so a pipe can route it past other blocks and reach furnaces across a gap. Pipes are efficient because they hold no block entity, which means many pipes can be placed without a noticeable cost to performance. The Thermostat controls how heat moves between Heaters: by default it passes heat through itself only when redstone-powered, and only in the direction it faces. Right-clicking it opens a screen where a fuel item in the central slot switches it to a fuel filtering mode, so it propagates only heat generated by fuel and converts unpowered blocks into a heat repeater.

Heater needs Burning, which is a required dependency, and Fabric API. The mod runs on client and server, so the server and every player install it. Its textures were created by StarOcean. Files are published for Fabric only, across 21 release versions 1.20.1 – 26.3, and the code is open source under the MIT License.