Growth may be limited by the trend toward repairing and retrofitting, rather than replacing, existing boilers; the use of small boilers, which require less onsite assembly; and automation of production technologies. However, demand for more boilermakers may stem from environmental upgrades required by Federal regulations such as the Clean Air Act.

Most industries that purchase boilers are sensitive to economic conditions. Therefore, during economic downturns, boilermakers in the construction industry may be laid off. However, because maintenance and repairs of boilers must continue even during economic downturns, boilermaker mechanics in manufacturing and other industries generally have stable employment.