- CHI-SE is governed by the City of Chicago Department of Buildings and administered by Continental Testing Services.
- The written exam is three hours, multiple-choice, and requires a score of 70 or higher to pass.
- Candidates must be at least 20, of good character, with two years of relevant practical experience.
- Safe Operation of Steam Boilers and Controls are the two heaviest domains, each worth 16%.
What the CHI-SE Certification Actually Is
The City of Chicago Stationary Engineer License Written Exam - referred to on this site as CHI-SE - is the credentialing test that determines whether an individual is qualified to legally operate, manage, or maintain steam boilers and related equipment within the city limits of Chicago. This is not a private industry certification issued by a trade association; it is a municipal license tied directly to Chicago's building and mechanical codes. If you're asking what is CHI-SE for the first time, think of it as the gatekeeping exam that stands between a candidate with hands-on boiler-room experience and a legally recognized license to operate that equipment in Chicago facilities.
Because the acronym CHI-SE is used loosely across the web, it's worth being precise here: this article, and every other page on this site, refers exclusively to the Chicago municipal license exam. If you've landed on other explainer pages like CHI-SE Meaning, What Does CHI-SE Stand For?, or What Is A CHI-SE?, they all point back to this same, single definition.
Who Governs and Administers It
The CHI-SE license sits under the authority of the City of Chicago Department of Buildings. That department sets the eligibility rules and issues the license itself once a candidate passes. The actual written examination, however, is administered by Continental Testing Services, a third-party testing organization contracted to handle scheduling, proctoring, and scoring on behalf of the city.
Eligibility Requirements
Before you can even sit for the written exam, the Department of Buildings requires that applicants meet three baseline conditions:
- Be at least 20 years old at the time of application
- Demonstrate good character, as evaluated through the application process
- Have at least two years of practical experience in the management, operation, or construction of steam engines and boilers
These aren't suggestions - they're prerequisites that gate whether you can register for the exam at all. If you're unsure whether your work history qualifies, a full breakdown of how experience is documented and evaluated is covered in CHI-SE Requirements 2026: Eligibility, Prerequisites & How to Qualify.
Exam Format and Scoring
The CHI-SE written exam is a three-hour, multiple-choice test. Every question follows the same structure: one correct answer accompanied by three distractors. There's no essay component, no practical demonstration on test day, and no partial credit for reasoning - it's a straightforward accuracy test against a fixed content outline.
To pass, candidates need a score of 70 or higher. There's no separate cutoff per domain listed in the official materials - your overall score is what matters. That said, because Safe Operation of Steam Boilers and Controls each carry 16% weight, underperforming in either of those two domains has an outsized effect on your total score compared to a lighter domain like Water and Steam Properties or Fuel Combustion and Byproducts, each at 7%.
Key Takeaway
Because the passing threshold is a flat 70, treat every domain as scoring the same per question - but spend your limited study hours proportionally to domain weight, not evenly across all nine.
For a deeper walkthrough of exactly how the scoring threshold works and what a "70" really means in practice, see CHI-SE Passing Score 2026: Exactly What You Need to Pass.
The 9 Exam Domains
The Continental Testing Services content outline breaks the written exam into nine domains. Each one represents a percentage of the total question pool, so your study time should roughly mirror these weights.
Domain 1: Types of Boilers (10%)
Covers the structural and functional differences between boiler types you'll encounter in Chicago's commercial and industrial buildings.
- Identifying boiler classifications and their typical applications
Domain 2: Basic Principles and Units (12%)
Foundational physics and measurement concepts that underpin nearly every other domain on the exam.
- Pressure, temperature, and energy unit conversions
Domain 3: Water and Steam Properties (7%)
The behavior of water and steam under varying pressure and temperature conditions inside a boiler system.
- Phase changes and their operational implications
Domain 4: Combustion Principles (12%)
The chemistry and mechanics of how fuel is burned efficiently and safely to generate heat.
- Air-to-fuel ratios and combustion efficiency factors
Domain 5: Safe Operation of Steam Boilers (16%)
The largest domain on the exam. Covers procedures, protocols, and judgment calls required to run a boiler safely day-to-day.
- Startup, shutdown, and emergency shutdown sequences
Domain 6: Controls (16%)
Tied with Domain 5 as the heaviest-weighted topic. Focuses on the instrumentation and automatic systems that regulate boiler behavior.
- Pressure and water level control devices and their failure modes
Domain 7: Maintenance and Safety (8%)
Routine upkeep tasks and the safety practices that prevent equipment failure or injury.
- Inspection schedules and preventive maintenance logic
Domain 8: Equipment and Safety (12%)
Ancillary equipment, valves, and safety devices that support the primary boiler system.
- Safety valve function and relief device sizing concepts
Domain 9: Fuel Combustion and Byproducts (7%)
What happens after combustion - emissions, byproducts, and their handling implications.
- Byproduct composition and its relationship to combustion efficiency
For a longer, item-by-item breakdown of what to expect within each of these nine areas, read the full CHI-SE Exam Domains 2026: Complete Guide to All 9 Content Areas.
| Domain | Weight |
|---|---|
| Safe Operation of Steam Boilers | 16% |
| Controls | 16% |
| Basic Principles and Units | 12% |
| Combustion Principles | 12% |
| Equipment and Safety | 12% |
| Types of Boilers | 10% |
| Maintenance and Safety | 8% |
| Water and Steam Properties | 7% |
| Fuel Combustion and Byproducts | 7% |
Fees and Registration Mechanics
The current examination fee for CHI-SE is $150. That fee covers your seat for the three-hour written test administered by Continental Testing Services. If you pass, a separate initial license fee of $75 applies to actually receive your Stationary Engineer license from the Department of Buildings.
A more complete breakdown of every cost associated with earning and maintaining this license - including what happens if you need to retest - is available in CHI-SE Certification Cost 2026: Complete Pricing Breakdown. If you're still weighing whether pursuing this license makes financial sense for your career, Is the CHI-SE Certification Worth It? Complete ROI Analysis 2026 tackles that question directly.
Who Hires Licensed Stationary Engineers
A CHI-SE license is a hard requirement for operating steam boiler systems in many Chicago buildings - not a nice-to-have. Facilities that commonly require a licensed stationary engineer on staff or on contract include:
- High-rise commercial office buildings with central steam heating plants
- Hospitals and large healthcare campuses running boiler-dependent HVAC and sterilization systems
- Universities and large institutional campuses with district heating loops
- Manufacturing and industrial facilities that rely on steam for process heat
- Municipal and public buildings maintained under city facilities departments
Because the license is tied to legal building operation requirements rather than a voluntary credential, demand for licensed engineers tracks directly with Chicago's building stock and its steam infrastructure. If you're evaluating career paths after licensing, CHI-SE Jobs outlines the kinds of roles that typically require this license, and CHI-SE Salary Guide 2026: Complete Earnings Analysis looks at how compensation is typically structured for licensed engineers in the field.
A Domain-Based Prep Timeline
Rather than studying all nine domains equally, structure your prep around domain weight and dependency. Domain 2 (Basic Principles and Units) underpins several other domains, so it belongs early. The two 16% domains - Safe Operation of Steam Boilers and Controls - deserve the longest, most repeated study blocks since they represent nearly a third of the exam combined.
Foundations
- Domain 2: Basic Principles and Units
- Domain 1: Types of Boilers
Combustion and Water Chemistry
- Domain 4: Combustion Principles
- Domain 3: Water and Steam Properties
- Domain 9: Fuel Combustion and Byproducts
The Heavyweights
- Domain 5: Safe Operation of Steam Boilers
- Domain 6: Controls
Equipment, Maintenance, and Full Review
- Domain 7: Maintenance and Safety
- Domain 8: Equipment and Safety
- Timed full-length practice run at ../
If you want a more detailed week-by-week study plan built specifically around passing on your first attempt, see CHI-SE Study Guide 2026: How to Pass on Your First Attempt. And if you're still trying to gauge how challenging this exam is relative to your current boiler-room experience, How Hard Is the CHI-SE Exam? Complete Difficulty Guide 2026 breaks down the difficulty factors in detail.
Running realistic practice questions under actual three-hour time pressure at our CHI-SE practice test platform is one of the most reliable ways to confirm you're pacing correctly across all nine domains before test day.
Frequently Asked Questions
Continental Testing Services administers the exam on behalf of the City of Chicago Department of Buildings, which governs the license itself.
The exam is a three-hour, multiple-choice test with one correct answer and three distractors per question. Candidates need a score of 70 or higher to pass.
You must be at least 20 years old, of good character, and have at least two years of practical experience managing, operating, or working with steam engines and boilers.
The current exam fee is $150. If you pass, a separate initial license fee of $75 applies for the Department of Buildings to issue your license.
Safe Operation of Steam Boilers and Controls are the two largest domains, each accounting for 16% of the exam content.
Understanding exactly what CHI-SE stands for, who governs it, and how the nine domains are weighted gives you the framework needed to study efficiently rather than broadly. For related terminology questions, What Does CHI-SE Mean? and What Is CHI-SE Certification? cover foundational definitions, while CHI-SE Training outlines preparation resources beyond the official study guide.