Boilermakers build, install, and repair boilers. They also work on other large containers that hold liquids and gases.

Boilermakers read blueprints and mark reference points on boiler foundations. They attach ropes or chains to the boiler pieces, and signal to crane operators where to move them. Boilermakers use hammers, files, grinders, and cutting torches to remove uneven edges or reshape bent plates. They align the sections and bolt or weld the pieces to attach them. They test for leaks or other defects. They may put together large pieces before installation to make sure everything fits.

Boilermakers regularly maintain boilers. They update the burners, boiler tubes, and other parts to increase efficiency. Boilermaker mechanics inspect boilers and repair or replace any parts that are not working properly.