Nuclear Power Heat Management Guide

If your power grid keeps sagging under late-game demand, or you want a cleaner long-term setup than piles of boilers, nuclear power is the upgrade that turns heat into huge amounts of steam power. The trick is not just unlocking the reactor, but building the whole heat chain in the right order so you do not strand your Heat exchanger blocks with a temperature that never quite reaches steam-making range. This guide walks you through what to unlock, what to craft, how to lay out the heat network, and how to avoid the common mistake of running heat too far from the source.

Unlock the right heat tech before you start building

Start by checking which heat source you actually have access to. Nuclear power requires Uranium processing first, and then its own research, with a cost of Automation science pack×1, Logistic science pack×1, Chemical science pack×1. If you are on Gleba and have the Heating tower research unlocked through Planet discovery Gleba, that is a separate heat source option with a different use case.

Do not start planning the full plant until you know which route you are taking. If you have Nuclear power, you are building a reactor-based steam plant. If you have Heating tower, you are building a chemical-fuel heat source that can feed steam power or help with freezing protection. Those are both heat systems, but they are not the same build, and planning around the wrong one wastes space and materials.

Craft the heat infrastructure before placing the reactor

Before you place anything, stockpile the parts for the entire chain. Nuclear power is not “drop one reactor and done”; you need the heat distribution, the steam conversion, and the power conversion ready so the plant can come online immediately. The biggest bottlenecks are usually the Nuclear reactor itself, because it asks for Concrete×500, Steel plate×500, Advanced circuit×500, Copper plate×500, and then the supporting steam side, especially Heat exchanger and Steam turbine production.

Here is the core reference for the build pieces you should line up first:

Build the support factory first, then the plant. In practice, that means you should have Heat pipe, Heat exchanger, and Steam turbine production buffered before you place the first reactor. If you are short on Uranium-235, keep it reserved for fuel cells rather than scattering it into unrelated production.

Lay out the heat source so temperature can actually reach your exchangers

This is the part where most players lose efficiency: the heat path is too long, or the power load is too high for a single run. A Heat pipe holds and transfers heat energy along connected segments, but each segment loses temperature based on how much power is being transmitted. The important consequence is simple: you cannot place the Heat exchanger wherever you feel like and expect it to work. It has to receive enough heat to reach 500°C.

Use the straight-run estimate L = 500 / (1 + P/15) to judge how far heat can travel, where P is the transmitted power in megawatts. If you are pushing a lot of heat down one line, the usable length drops fast. That means your best move is usually to keep the run short, or split the load across multiple parallel lines instead of forcing one line to carry everything.

Also remember that a Nuclear reactor can act as a thermal conductor even when it is not fueled. That makes it useful as part of the heat path if you need to bridge a layout or spread heat through a compact core. Use that to your advantage, but do not treat it like a replacement for sane pipe routing. The reactor helps; it does not erase the limits of the heat network.

The practical rule is: place the source, then place the exchangers close enough that they still hit 500°C, and only then extend if the temperature math supports it. If you are unsure, shorten the run rather than gambling on a long one that never reaches steam-making temperature.

Build the steam block and connect it to your electric grid

Once the heat side is laid out, convert that heat into power with the standard steam chain. A Heat exchanger uses heat energy to turn water into steam, and a Steam turbine consumes steam to create electric energy. That is the core of nuclear power: heat in, steam out, electricity at the grid.

Use Boiler units only as a fallback or for simpler early steam setups. A Boiler burns fuel to turn water into steam, which is useful, but it is not the centerpiece of a nuclear build. For nuclear power, your goal is to let the reactor feed Heat exchanger blocks, then pipe the resulting steam directly into Steam turbine blocks. Keep the steam line short and direct, and feed the turbines into your main electric network without unnecessary loops or side branches.

If you are adding a Heating tower, use it as a heat source feeding connected heat pipes, then attach the same exchanger-to-turbine chain. It generates heat from chemical fuels with very high efficiency, does not stop burning when at maximum temperature, and passes heat to connected heat pipes for steam power or freezing protection.

Run and scale the plant without choking the heat flow

When you expand a nuclear plant, place Nuclear reactor units so they benefit from adjacency. The heat output increases when they are built next to other reactors, so spacing them like isolated machines is a mistake. Build your reactor block intentionally, then extend the Heat pipe network outward only as far as the temperature budget allows.

As you scale, keep checking the exchanger side first. New Heat exchanger blocks are only useful if the heat path still gets them to 500°C. If a bigger reactor block gives you more heat than your current layout can carry, do not just keep adding exchangers at the end of the same line. Split the load, shorten runs, or redesign the heat core so the temperature stays usable.

If you are using a Heating tower, treat it differently from a reactor setup. It generates heat from chemical fuels with very high efficiency and does not stop burning when at maximum temperature, so you do not need to babysit it around a heat cap. Just feed it reliably and let the connected Heat pipe network carry the heat where it needs to go.

On Aquilo, Heat pipe has one more job: it can keep entities warm and prevent freezing. In that mode, Heat pipe only needs to be at least 30°C to keep an entity warm, and it does not lose heat to the environment, only to the entities it is warming. That makes it a special-purpose heat network, not a normal steam layout. If you are playing there, build for freezing protection first and steam second.

The final habit to keep is simple: do not overextend heat delivery. Shorter runs, parallel lines, and reactor adjacency will save you far more trouble than trying to force one long chain to do everything. Build the heat source, prove the temperature at the exchanger, and then scale from there.