Our Skilled Trades

Stationary Engineer

IUOE Hero Image

Home » Join » Our Trades » Stationary Engineer

What is a Stationary Engineer

Stationary Engineers are responsible for operating, monitoring, and maintaining the mechanical systems that keep buildings and facilities running safely and efficiently. These systems often include heating, ventilation, and air conditioning (HVAC); boilers and chillers; generators and turbines; diesel engines; pumps and piping; refrigeration; electrical systems; compressed gas systems; building automation systems; and other critical infrastructure within commercial buildings and industrial plants.

Unlike project-based construction work, Stationary Engineers typically work in fixed locations, ensuring facilities operate reliably around the clock. Their role requires strong technical knowledge, close attention to detail, and the ability to respond quickly to system issues. Stationary Engineers use hand and power tools to perform a wide range of maintenance and repair tasks—from routine adjustments and component replacements to full system overhauls.

Stationary Engineers are also responsible for monitoring system performance, inspecting safety devices, identifying potential issues, and documenting operating conditions and maintenance activity through detailed equipment logs. Their work plays a vital role in maintaining safe, comfortable, and functional environments in the places people work, live, and receive essential services.

In many facilities, a Stationary Engineer may oversee the operation, maintenance, and repair of all mechanical systems within a building, power plant, or engine room. In larger operations, a Chief Engineer may supervise assistant stationary engineers and other specialists, such as turbine operators, boiler tenders, and air-conditioning or refrigeration technicians. In smaller buildings or plants, a single Stationary Engineer may be responsible for the entire facility’s mechanical operation and maintenance.

Specialized Areas of Work

Become a Stationary Engineer

  • An average of four years of apprentice training, including on-the-job and classroom training.
  • A good work ethic and responsible attitude.
  • An interest in learning highly technical subjects like boiler operation and maintenance, air conditioning and refrigeration, safety, practical chemistry, elemental physics, instrumentation and controls, electronics and computer controls.
  • A willingness to keep learning. Due to the increasing complexity of the equipment, stationary engineers must continue to update their skills, and many go on to take college courses.
  • The ability to do shift work, and to work on weekends and holidays.

Selection criteria vary from one local to another, so you should contact an IUOE stationary local in your area for specific information. However, minimum requirements include that applicants be at least 18 years old, have a high school diploma or GED, be legal to work and drug free. Having previous mechanical or technical experience would be helpful, but may not be necessary.

High quality, skill development training is provided by apprenticeship and training programs at IUOE stationary local unions. These recognized programs are jointly sponsored by IUOE local unions and the employers who hire stationary engineers.

The average length of a stationary engineer apprenticeship is four years. During this period, apprentices learn their craft by working with skilled stationary engineers at an actual workplace, and by attending related classroom instruction. In some cases, apprentice training is supplemented by courses at trade or technical schools and, due to the increasing complexity of the equipment with which they work, many stationary engineers have also taken college courses.

Journey level stationary engineers are often encouraged by their employers to continue their education. Many IUOE locals offer free training to their members to help them broaden their skills, keep up with changes in the industry and improve their employability. Additional training has helped many IUOE members move up to management or supervisory positions.

Journey level and apprentice wages vary considerably across North America, so you will need to contact an IUOE local in your area for specific information. Starting pay for an apprentice varies from 45% to 60% of the journey level rate. Pay increases are scheduled at designated times during apprenticeship and are negotiated as part of each local’s contract with employers. During the final year of apprenticeship, wages are typically 80% to 95% of the journey level rate.

Specialized Areas

Skilled Trade
Specialized Technical Professionals
Skilled Trade
Healthcare and Public Professionals

Take Your Career to New Heights

Become an Operating Engineer

Lift your career to new heights through strong training, steady work, and the opportunity to build or maintain infrastructure and building systems that matter—supported by wages and benefits that last a lifetime. Becoming an Operating Engineer could be the right path for you.

Join Now

Find an IUOE Local

IUOE locals are the primary point of contact for training, labor agreements, workforce needs, and member services. Use the IUOE local directory to find contact information and learn more.

Member Stories