Bronze Age

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In this era, you’ll need mostly bronze. Bronze is made with tin and copper. To make bronze dust you’ll need to use the Mortar on tin and copper ingots to turn them into dust. The dusts can then be combined into Bronze Dust which can then be smelted inside a furnace. Once you have crafted your Alloy Smelter, you can craft 4 bronze ingots from 1 tin and 3 copper.

The machines in this era use steam as energy. Steam is produced in a Boiler, and is used to power machines. The steam needed differs between machines and recipes. If you have extra resources I’d recommend building an Iron Tank (Railcraft) and use it as a steam buffer between the boilers and machines. Until you have an Iron Tank, you can use large bronze pipes between machines to store a small amount of steam.

Steam is hot. You’ll need decent pipes to avoid accidents with steam leaks. Wooden pipes can be used for transporting water to the boilers; using wooden pipes for steam might harm you.

Also note that GregTech uses a different method of measuring fluids.
1mB = 1Liter = 1L
1bucket = 1000Liter = 1 cubic meter = 1 block worth of fluid

There are 20 ticks (/t) in a second (/s), so when 6mB/t or 6L/t is mentioned, it equates to 120Liters/s or 120L/s


There are multiple Boilers available in Gregtech. All boilers need both water and fuel to produce steam, except the simple solar boiler, which needs to be picked up and placed back every once in a while rather than fueled. They produce steam in different rates and use more fuel the more advanced they are. There are also Multiblock Boilers available in higher tiers. Information about these Large Boilers will be available in another book.

To avoid problems with automation of these boilers, it is recommended to input water from below and output steam from the top since the sides can be used for both auto input and output, causing steam to get into your water pipes.

In most GT boilers 1L of water equals 150L of steam. However, this is not true for the Lava Boiler as it creates 300L of steam from 1L of water.

Explosion Risk

Adding water to a dry but heated Boiler will cause an explosion.

Small Coal Boiler (Bronze)

This is your first Boiler. It will accept all kinds of coal as fuel (not compressed blocks), and will produce 6L/t of steam while heated. When the boiler is fully heated one piece of charcoal will last for 360 seconds. During the heating process one charcoal lasts 96 seconds.

Simple Solar Boiler (Bronze)

This Boiler does not need coal to produce steam. It needs to be in sunlight to produce steam. It will produce 6L/t of steam while heated This Boiler will be producing less steam over time after being used for more than 3.5 hours (in real life time) the simple solar boiler needs to be wrenched every once in a while rather than fueled Also unlike other boilers, The Simple solar boiler will only extract steam through its output square side; default side for this is the back side.

High Pressure Coal Boiler (Steel)

The High Pressure Coal Boiler works the same way as the Small Coal Boiler. It burns fuel twice as fast but produces 15L/t of steam while heated.

High Pressure Lava Boiler (Steel)

This is the most efficient single block Boiler. It uses lava as fuel and produces 30L/t while heated. 1 bucket of lava equals to 200,000L of steam while it is heated.

Steam Machines


All Steam Machines will have an exhaust side; default side for this is the back side. (The square you see on the machines in the picture above is the exhaust) The Machine will exhaust steam every time it has completed an operation. If the Exhaust is blocked the machine will not be able to complete its operation. You can change the side of this exhaust with a GT Wrench. Standing near this exhaust may harm you.

Energy and Steam Machine Usages

Steam Machines only works with recipes that requires 32EU/t or less. The steam/t which Steam Machines drain is exact as EU/t for low pressure steam machines. The crafting time is doubled so total steam usage in L is twice as high as EU usage in LV recipe.

Alloy Smelter

The Alloy Smelter is used to combine two kinds of materials together to create a new material. It can be used to produce bronze with less loss compared to crafting bronze dust with your hands, and also to make your first rubber bars. It will use up to 32L/t of steam, depending on the recipe.


The Compressor is used to compress items; for example ingots into blocks, nuggets into ingots. It uses 2L/t of steam and is compressing a single item for 30 seconds, resulting in a total steam cost of 1200L of steam, with exception for compressed fireclay: 4L/t, 8 seconds and 640L of steam.


The Extractor uses 2L/t of steam and extracts a single item in 30 seconds, resulting in a total steam cost of 1200L of steam with exception for sugar beet extraction: 8L/t, 16 seconds, 2560L of steam. It’s required for your first rubber.

Forge Hammer

The Forge Hammer can be used to crush ores. It can also be used instead of the Hammer (GT Tool) to create plates and other items. It is more efficient than using the hand hammer, creating 2 plates with 3 ingots. Most recipes actually process quite fast. It will use up to 30L/t of steam, depending on the recipe.


The Furnace can be used like a vanilla Furnace, using steam instead of Coal to power it. It is using 4L/t of steam and smelts one item every 12.8 seconds, resulting in a total steam cost of 1024L steam, so overall is more fuel efficient than a normal furnace. Also smelting iron nuggets yields wrought iron nuggets which has 1.5x more durability than normal iron.


The Macerator is used to double the yield of ores. It is using for most of recipes 2L/t of steam and macerates one item every 30 seconds, resulting in a total steam cost of 1,200L per operation.

High Pressure Steam Machines

These machines are upgraded versions of the other Steam Machines. They will drain steam 2x as fast as Steam Machines, but work at double speed. This means the steam consumption remains the same but you will probably need better pipes to keep up with steam drain of those. They are more efficient than LV machines if you consider efficiency of steam turbines, but they require more infrastructure to be automated.