The median annual wage for Stationary Engineers and Boiler Operators in Illinois is $112,230 (May 2024 BLS OES). The mean (average) is $103,530.
Pay spans roughly $67,570 at the 10th percentile to $128,390 at the 90th, so experience and specialisation move this figure a lot. At the median that is about $53.96 per hour. An estimated 1,670 people work as stationary engineers and boiler operators in Illinois.
| Median (annual) | $112,230 |
| Mean (annual) | $103,530 |
| Median (hourly) | $53.96 |
| 10th percentile | $67,570 |
| 90th percentile | $128,390 |
| Employment | 1,670 |
Updated 2026-07-23.
Source: BLS OES May 2024 — bls.gov/oes. Checked 2026-07-23.