Steam boiler

Steam boilers are used with coal and nuclear-powered engines. A heat source provides hot fluid to the boiler, and fresh water is converted into steam.

Boilers can begin to build up pressure when their temperature is at least 100, and they'll build up pressure faster when they are at higher temperatures. Boilers explode at a pressure of 10. There appears to be no performance difference between pressures of 5 to 10, though pressures below 5 tend to reduce performance.