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Mekanism Wiki
wiki.aidancbrady.com › wiki › Fusion_Reactor
Fusion Reactor - Official Mekanism Wiki
The Fusion Reactor is a multiblock structure that produces ludicrous amounts of power by using either Deuterium and Tritium, or D-T Fuel. By water cooling the structure, steam will be produced alongside power, which can be used for powering an Industrial Turbine.
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Reddit
reddit.com › r/feedthebeast › [atm9] i build a max rate watercooled mekanism fusion reactor! producing ~494 mrf/t (mekanism 10)
r/feedthebeast on Reddit: [ATM9] I build a max rate watercooled mekanism fusion reactor! Producing ~494 MRF/t (Mekanism 10)
January 5, 2024 -

I want this to be a guide for newer players since I couldn't find any good information out there that is resonably new.

Firstly you need D-T fuel to get that 1000mb/t injectino rate instead of a miesly 98.

For Lithium I build 5 max sized thermal towers to produce brine and 1 for lithium. These Towers are powered by induvidual resistive heaters at 1.5Krf/t. I used 64 solar nutron activators just to be safe. Everything on this side is buffered by 4x4x4 dynamic tanks (lithium as liquid) and observered by a simple computer craft setup. Some better pipes needed here.

I have 52 max upgraded pumps for heavy water (probably more than needed). 4 pumps are on a 3x2x3 puddle in a plus shape. 2 max upgraded electrolysers are enougth but I build 32 on 3 speed upgrades since I had some over and it improves energy efficienty. Basic tier pipes are good.

Deuterium and Tritium into Quantum entangloporters and into 2 max upgraded chemical combiners fueling the reactor. Water can be supplied by a sink and integrated tunnels/dynamics

Remember to still set the injection rate to 98 since it increases the water (and steam) tank. You can still use the generated energy from the reactor even if it's water-cooled but it's just 102 mrf/t then.

You need atleast 100 ultimate pressurized tubes to transport the 98'000'000 mb/t of Steam since the quantum entangloporter can only transfer around 8KB of steam per tick. I suggest just hooking the turbines up the the reactor directly.

9 max sized turbines are needed to be the most efficient with your steam when converting it to energy. You want as much blades as possible. If you don't go with the max amount of vents you may need more turbines. Remember, the top of the turbines can be vents aswell.

I connected everything up using 2 seperate flux networks. One for the generation going to my induction matrix and one for the consumers of my induction matrix.

If I don't need that much energy the turbines will stop moving and the reactor will be building up heat and is able to cover up to 200MRF/t by it self.

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More results from reddit.com
Discussions

D-T Fuel Fusion Reactor Water-Cooling Problem
Issue description Running a Fusion Reactor on D-T Fuel and then trying to water cooling it causes a problem where the water and steam tank of the reactor doesn't enlarge because the reactor doe... More on github.com
🌐 github.com
1
January 14, 2024
Fusion reactor doesn't accept water after the server is restarted
Issue description The server is running on Aternos, so it shuts down a couple minutes after the last player logs off. Point being, the server gets stopped and started regularly. There's an exis... More on github.com
🌐 github.com
8
December 22, 2024
Water cooled fusion reactor
add ultimate pressure tubes forwarding it into ultimate trash cans. i use it for the fission reactor and work like a charm. U have to configure both ends of the tube. add more if necessary More on reddit.com
🌐 r/allthemods
8
2
May 6, 2024
Water supply for Mekanism Fusion Reactor
That is an insane amount of power, do you really need that much? Probably your only option is to use Pressure Pipes , that mod has an infinite water source and pipes with infinite extraction and transfer rates. More on reddit.com
🌐 r/feedthebeast
20
5
August 6, 2016
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Feed The Beast Wiki
ftb.fandom.com › wiki › Fusion_Reactor_(Mekanism)
Fusion Reactor (Mekanism) - Official Feed The Beast Wiki
Since Mekanism v10, players in Creative Mode may right-click the Laser Focus Matrix with a Configurator to instantly start the reactor, with no prerequisites beyond the D-T filled Hohlraum. By directly inserting 1 000 mB/t of D-T fuel into a water-cooled reactor, it produces enough steam to require using six maximum-size Industrial Turbines running at 46.67 million FE/t each, and generates a further 101 million FE/t directly, resulting in a combined 381 million FE/t.
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GitHub
github.com › mekanism › Mekanism › issues › 7977
D-T Fuel Fusion Reactor Water-Cooling Problem · Issue #7977 · mekanism/Mekanism
January 14, 2024 - There is also the minor bug where setting the injection rate to 0 while using D-T Fuel makes the reactor's water and steam tank capacities 0 mB which means the reactor can't be water-cooled. ... Build a Fusion Reactor and provide it D-T Fuel and ignite it.
Author   mekanism
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YouTube
youtube.com › watch
Surviving With Mekanism v10 :: E21 - Water Cooled Fusion Reactor - YouTube
Today we set up a water cooled fusion reactor, which generates both power and steam by inputting water. When used in combination with the industrial turbine,...
Published   January 3, 2021
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GitHub
github.com › mekanism › Mekanism › issues › 8281
Fusion reactor doesn't accept water after the server is restarted · Issue #8281 · mekanism/Mekanism
December 22, 2024 - There's an existing issue where a freshly constructed reactor (including if I modify it by removing and replacing a valve or whatever) won't accept water, but that's easy enough to work around by changing the burn rate to a different value then changing it back.
Author   mekanism
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YouTube
youtube.com › watch
Fusion Reactor Watercooled Mekanism Tutorial 1.16 English
Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube.
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YouTube
youtube.com › dylan
Fusion Reactor Watercooled 🔌 Mekanism Tutorial 1.16 🔌 Deutsch / German - YouTube
Playlist: https://www.youtube.com/playlist?list=PL7Icn31fcQyip6-GCEoYZ2twUFh5YvKFTDiscord: https://discord.gg/Xuu4Wn3ay2MMOGA: https://www.mmoga.de/?ref=5003...
Published   November 30, 2021
Views   3K
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YouTube
youtube.com › watch
Mekanism 110 Episode 26 - Water Cooled Fusion Reactor - YouTube
This video is the twenty sixth episode of Mekanism 110 a survival lets play concentrating on the Mekanism mod. In this episode we convert the Air Cooled Reac...
Published   February 4, 2017
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Reddit
reddit.com › r/allthemods › water cooled fusion reactor
r/allthemods on Reddit: Water cooled fusion reactor
May 6, 2024 -

So, i just made a fusion reactor and was looking at what i could do to maximoze efficeny on. I believe if my math is right, water cooling it is like 2.5 time as efficent. Only problem is i have no idea how to extract all that steam out. Is there actually a way to do that or is it better to run it maxed out without watercooling?

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Reddit
reddit.com › r/feedthebeast › water supply for mekanism fusion reactor
r/feedthebeast on Reddit: Water supply for Mekanism Fusion Reactor
August 6, 2016 -

I've been experimenting with Fusion Reactors and Industrial Turbines on a creative world before building one in my survival save, but I can't figure out how to supply the reactor with enough water to reach the 3.6M mB/t steam production it's capable of at an injection rate of 98. I'm currently pumping water using 4 Liquid Transfer Nodes with three stacks of World Interaction Upgrades and three stacks of Speed Upgrades each and it's nowhere near enough.

How the hell do I produce the massive amount of water required by these things? I'm playing Resonant Rise Mainline with all the optional mods enabled.

Also, another question: How do I transfer the 3.6 million mB/t of steam from the reactor to the turbines? I've tried using Thermal Dynamics' Super-Laminar Fluiducts that are supposed to transfer an infinite amount of liquid per tick (according to the description) but I can't get the turbines to use more than 600 mB/t. Problem solved, I was using a servo on the pipe itself instead of setting the reactor port to output, and the servo could only transfer 1200 mB/t. Still need help with the water supply though.

EDIT: Problem solved using Pressure Pipes! Thanks for the help!

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GitHub
github.com › mekanism › Mekanism › issues › 6013
Electric Pumps · Issue #6013 · mekanism/Mekanism
March 31, 2020 - I am trying to water cool the fusion reactor, and cant help but think im doing something wrong, using electric pumps im trying to feed water in. i currently have 78 pumps with 8/8 upgrades sitting above an area of 17x14 and above 60 blocks deep of source blocks of water.
Author   mekanism
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YouTube
youtube.com › watch
Surviving With Mekanism v9 :: Ep.19 - Liquid Cooled Fusion Reactor - YouTube
Today I set up a liquid cooled fusion reactor by adding onto the fusion reactor I set up last episode. To do this, I pump massive amount of water into the re...
Published   October 15, 2016
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NamuWiki
en.namu.wiki › w › Mekanism › 융합로
Mekanism/Fusion Furnace - NamuWiki
December 27, 2025 - If you want water cooling, you need more water input and steam output ports in addition to the above ports, so a total of five ports need to be installed.[9] Very little of the fusion reactor loses temperature and builds up in the energy slot.[10] The maximum power transmission amount is 2.147 billion RF/t, which is the maximum value that an int data type can have, as those who are quick-witted will know. virtually infinite.[11] Mekanism mode also has an induction matrix that can store large amounts of electricity, but it is much more resource-intensive and difficult to construct compared to Draconic's energy core.[12] 0.6 GRF.
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Enigmatica
wiki.enigmatica.net › enigmatica6 › energy-generation › energy-generation › mekanism
Mekanism | Enigmatica 6
December 25, 2021 - Passive generation is also ... out of Fusion. Water cooled fusion generates enough steam to run a single max sized turbine at about 40% flow rate, generating another 3.18 million RF/t....
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Reddit
reddit.com › r/feedthebeast › mekanism 10.2.5 - fusion reactor statistics for maximum water-cooling, and a question
r/feedthebeast on Reddit: Mekanism 10.2.5 - Fusion Reactor Statistics for Maximum Water-Cooling, and a Question
May 22, 2024 -

Starting with my question, does anyone know or has anyone successfully implemented a max-burn Fusion Reactor into Thermoelectric Boilers for max power output and has the numbers on it?

Now, to the math. In the futile endeavor to engineer power generation to reasonably charge the Infinity devices of Industrial Foregoing to Artifact-tier, I've spent about a month or two now experimenting and calculating what the minimum machines are exactly necessary to fuel as well as pull the most energy out of a Mekanism fusion reactor burning 1000 mb/t of D-T Fuel. Now, there's this post that previously provided numbers, but those were calculated by feeling, and I wanted hard numbers.

So, with the default Mekanism configs, let me begin with the fuel stats:

  • 1000 mb/t of D-T fuel uses 2 maxed Chemical Infusers (8 speed upgrades, 8 energy upgrades) for 1024 mb/t provision

  • 500 mb/t of Deuterium to fuel that takes 500 mb/t of Heavy Water, or 1 maxed Electrolytic Separator (provided Oxygen does not build up within it, otherwise, add a second with at least 4 speed) fed by 50 maxed Electric Pumps (A single maxed electric pump provides 10 mb/t of Heavy Water)

  • 500 mb/t of Tritium requires 6 Thermal Evaporation Plants: 5 max-height pumping out Brine at 1000 mb/t or more (1080 mb/t is cap for height 18), which then feed into another 9-18 Thermal Evaporation Plant transforming it to Lithium.

  • The 500+ mb/t of Lithium needs to be pumped to an array of Solar Neutron Activators, which have the highest efficacy in the Snowy Taiga biome (I even took the data of the biomes from Biomes o' Plenty). Using Botania's Teru Teru Bozu to reduce the chance of rain, on average 13 are needed to give a mean production rate over a full Minecraft day of about 528 mb/t ignoring throughput and storage problems, locational variance (XZ noise and Altitude efficiency), and forced weather.

Now, on to the extraction stats. Note the unit change due to the sheer volume:

  • The Fusion Reactor can boil up to 98k buckets of water every tick (setting the Fusion Reactor's Burn Rate to 98 expands its water tank). A singular max (17x17x18) Industrial Turbine processes up to 18,720 buckets per tick, so 6 are needed to handle the entirety of the steam.

  • Mekanism's Mechanical Pipes have a transfer rate of 128 buckets/tick for blocks ejecting into them, so 766 Ultimate Mechanical Pipes are needed to handle the max throughput if you're using saturating condensers to recycle the water. Connect from any Industrial Turbine vent to a Fusion Reactor port set to Input (No pipe tuning necessary). A singular sink fully surrounded by Ultimate Pipes set to "Pull" will fill the required capacity in a few minutes as the system runs to equilibrium. If using sinks to supply the water without recycling, use a different mod, as Mekanism requires 3063 connections set to "Pull".

  • Mekanism's Pressurized Tubes have a transfer rate of 1,024 buckets/tick for blocks ejecting into them, so only 96 Ultimate Pressurized Tubes are needed. Connect from an Fusion Reactor "Output" Port to all 6 Industrial Turbine input valves (No tube tuning necessary)

  • The Fusion Reactor itself will also undergo air-cooling, producing FE that may be extracted with a port and cable.

Overall, the results when I implemented it is only a measly <380 MFE/t, which will charge an Infinity Device to Artifact-tier in 38.5 years. Compared to the linked post, this power output is considerably lower, so I am unsure about whether my setup is the most efficient.

Air/Water Hybrid-Cooled Fusion Reactor core setup seconds before laser ignition. Tritium is stored in the Dynamic Tank after import through a Quantum Entangloporter, and Deuterium is being pumped up from below (not shown). Behind is a backup Fusion Reactor powering 4 Industrial Turbines via 1 Thermoelectric Boiler.
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Reddit
reddit.com › r/feedthebeast › mekanism fusion reactor water cooling
Mekanism Fusion Reactor Water Cooling : r/feedthebeast
March 10, 2023 - Are you trying to use the same ports you're inputting fuel in for the water? You need separate inputs for the water. Are you pumping enough water in? It could be turning to steam instantly depending on temperature. Are you using Mechanical Pipes? I've mistakenly used Pressurized Tubes before, easy to mix up.
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GitHub
github.com › mekanism › Mekanism › issues › 6871
Fusion Reactor water coolant filling up above max amount with a visual glitch · Issue #6871 · mekanism/Mekanism
January 11, 2021 - Attach Turbines for the water cooling · Put a lot of Creative Water Tanks feeding into the Fusion Reactor using Ultimate Pipes · Forge: 35.1.36 Mekanism: 10.0.18.445 Other relevant version: Minecraft 1.16.4 · [gist / pastebin / etc link here.
Author   mekanism
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TikTok
tiktok.com › discover › mekanism-fusion-reactor-switch-to-water-cooled
Mekanism Fusion Reactor Switch to Water Cooled | TikTok
March 9, 2026 - Learn how to switch to a water cooled fusion reactor using Mekanism for efficient energy production and cooling techniques.See more videos about Fusion Reactor Steam Tuebine Mekanism, Logik Air Cooler Water Refill, Fill Water in Logik Air Cooler, Difference Between Water Flosser and Waterpik, ...
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CurseForge
curseforge.com › minecraft › mc-mods › better-fusion-reactor-for-mekanism
Better Fusion Reactor for Mekanism PLUS - Minecraft Mods - CurseForge
This addon introduces a new layer of challenge and depth to the Mekanism Fusion Reactor. Your main objective is to keep the Current Reactivity (CR) as close as possible to the Target Reactivity (TR).