Keep boiler pressure on target
When a gauge drifts outside its set range, adjust the water, air or fuel to hold pressure.
Career profile
Stationary Engineer and Boiler Operator
Stationary engineers run boilers, pumps and more, supplying steam and heat to buildings and industry.
Catching a fault before service stops is the goal, so you watch pressure readings, adjust control settings and dig into problems.
A day in the life
Test and treat boiler water
Test the boiler water's quality and adjust its treatment to keep corrosion and deposits from forming.
Repair worn valves and gaskets
Isolate the equipment safely first, then fix a worn bearing, valve or leaky gasket, or arrange a replacement.
Respond to an alarm
When an alarm sounds, go inspect the equipment's safety devices, switches and gauges for leaks or malfunctions.
Spot a trend in the log
Comparing plant log utility readings over time, you notice a shift that could justify inspecting machines before failure.
Quick facts
High school + workplace training
United States · 2025–2035
$78,620/year
United States · May 2025
3.1% projected growth
United States · 2025–2035
Quick orientation
Preparation, pay & outlook
Preparation
High school + workplace trainingA high school diploma or equivalent is typical, followed by long-term training on the job.
Pay
$78,620/yearNational median for stationary engineers and boiler operators; $37.80 per hour.
Outlook
3.1% projected growthAbout 3,200 openings per year are projected nationally for stationary engineers and boiler operators.
Fit, tradeoffs & changing tools
You might like this if…
- You can stay attentive through repeated checks.
- You like finding why a machine behaves differently.
- You enjoy hands-on repairs and reading instrument values.
Things to weigh
- Some jobs require evening or overnight shifts, with workdays that rotate each week.
- Mechanical rooms can be hot and noisy. Maintenance can mean long periods standing or crouching around equipment.
Where AI may help
Computerized building controls help regulate temperatures and show how heating and cooling systems are performing.
What people still lead
You investigate unusual readings, troubleshoot equipment, and check that building spaces receive the conditions they need.
What we can’t predict yet
How much fault-finding software will take over remains uncertain; different plants combine older machinery and newer controls.
Pay in context
Earnings
The national median describes the whole occupation, not a starting offer.
The middle and the spread
The median was $78,620 a year, or $37.80 an hour. The 10th and 90th percentiles were $50,590 and $125,390 annually. Those are wage-distribution markers, not beginner and senior salaries.
Workplace type matters
Annual medians were $105,500 in local government excluding schools and hospitals; $80,800 in hospitals; $74,130 in manufacturing; $72,920 in educational services; and $55,220 in traveler accommodation.
Read the whole offer
Check whether quoted pay excludes overtime, shift premiums, and benefits. Ask how your experience and skills affect placement within the offered range.
Openings include replacement hiring
Employment is projected to grow 3.1% during 2025–2035, with about 3,200 openings annually. Many replace people who leave the occupation.
Getting started
Learn in an employer's trainee role
- What the route involves
- With a high school diploma or equivalent, learn from an experienced operator, beginning with temperature and pressure checks.
- What it can lead to
- Demonstrating competence lets you progress to more complicated operating and repair tasks.
Enter a stationary engineer apprenticeship
Union programs average four years.Paid
- What the route involves
- Combine paid work beside experienced engineers with classes in boilers, cooling systems, electricity, and controls.
- What it can lead to
- Build toward journey-level work across building mechanical systems.
- What to check
- International Union of Operating Engineers programs generally require age 18, a diploma or equivalent, work authorization, and drug-free status. Local selection requirements vary.
Some states and cities require licenses, usually involving experience and an exam. License classes limit equipment authority. Employers may also require competency exams before unsupervised operation; check local requirements before choosing training.
After entry
Career paths
This starts where the entry routes leave off: early work, growing capability, and advancement or specialization.
Get established
Learn the plant's normal readings and make dependable rounds. Keep logs clear enough to spot changes over time.
Build deeper skills
Develop your knowledge of refrigeration and computer controls as equipment changes.
Lead a plant crew
A chief engineer role can put you in charge of mechanical systems and the operators maintaining them.
Where you can work
Hospital utility plants
Steam and chilled-water systems serve patient and staff spaces. You may also check emergency power equipment; evening and overnight coverage can be part of the job.
- Indoors
- Shift work
- Safety-sensitive
Smaller commercial buildings
One engineer may cover the building's mechanical systems. That means broader responsibility across heating, cooling, and related equipment within one site.
- Indoors
- Physical demands
Try it
See whether the job clicks before you commit to the path.
Find a labeled steam-heating diagram. Trace water into the boiler, steam to the building, and condensed water back. Mark where you would want pressure or temperature readings. Notice whether following the system makes you curious.
Stay safe: Keep this exercise on paper; do not enter a boiler room or operate equipment.
Sources
- O*NET OnLine. 51-8021.00 — Stationary Engineers and Boiler Operators. Accessed 2026-10-04.
- O*NET OnLine / U.S. Bureau of Labor Statistics. National Wages: Stationary Engineers and Boiler Operators. Accessed 2026-10-04.
- U.S. Bureau of Labor Statistics. Occupational projections and worker characteristics. Accessed 2026-10-04.
- U.S. Bureau of Labor Statistics. Stationary Engineers and Boiler Operators — Occupational Outlook Handbook. Accessed 2026-10-04.
- International Union of Operating Engineers. Stationary Engineer. Accessed 2026-10-04.
- International Union of Operating Engineers. Earn While You Learn. Accessed 2026-10-04.
- Johns Hopkins Medicine. Stationary Engineer (Second Shift), Howard County Medical Center. Accessed 2026-10-04.
- Cleveland Clinic. Stationary Engineer — Neuro Expansion. Accessed 2026-10-04.