This guide covers Ohio’s three boiler-plant licenses end to end: how Section 4104.19 of the Revised Code and rule 1301:3-5-10 of the Administrative Code set the experience routes – 2,000 hours, or shorter hours paired with Division-approved courses – how the PSI examinations are built for each license at 30, 40, and 50 closed-book questions in three hours, the 70 percent passing standard common to all three, and the content outlines the PSI Candidate Information Bulletin publishes for each sitting.
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The licensing route at a glance
| Item | Verified position |
|---|---|
| Licenses in this program | Low Pressure Boiler Operator License; High Pressure Boiler Operator License; Stationary Steam Engineer License – three licenses under Ohio Revised Code Section 4104.19, covered in one program |
| Licensing authority | Ohio Department of Commerce, Division of Industrial Compliance; licenses issued by the Superintendent of Industrial Compliance under ORC 4104.19 |
| Examination administrator | PSI, under contract with the Division of Industrial Compliance. Examinations are computer-based, CLOSED BOOK, three hours, with an examination fee of $100 per the PSI Candidate Information Bulletin |
| Low Pressure Boiler Operator | 30 questions. Scope: steam boilers that generate not more than 15 psi. Passing score 70 percent |
| High Pressure Boiler Operator | 40 questions. Scope: steam boilers that generate more than 15 psi. Passing score 70 percent |
| Stationary Steam Engineer | 50 questions. Scope: steam turbines operating at a pressure of more than 15 psi and in excess of 30 horsepower, and high-pressure boilers. Passing score 70 percent |
| Experience routes (OAC 1301:3-5-10) | Each license: 2,000 hours of operating experience, or a shorter experience-plus-course route – Low Pressure: 400 hours plus an approved 50-hour course; High Pressure: 700 hours plus an approved 75-hour course, or a low pressure license plus 400 hours of high-pressure experience plus a 75-hour course; Stationary Steam Engineer: 700 hours plus an approved 125-hour course, or a high pressure license plus 700 hours of steam-turbine experience. Course providers and courses require Division approval, and an application is required before enrolling in a course for experience credit |
| Statutory floor (ORC 4104.19) | Age 18 or over; one year’s experience in the construction, installation, maintenance, repair, or operation of high pressure steam boilers or turbines, or the combination of experience and education the Superintendent accepts as the equivalent; application filed not more than 60 nor less than 30 days before the examination |
Read the table’s experience row twice, because it is where Ohio candidates win or lose their year. The 2,000-hour route is simple and slow. The course routes are faster and conditional: the course and its provider must be Division-approved, and the application for course credit comes before enrollment. The PSI figures – 30, 40, and 50 questions, three hours, closed book, 70 percent – are stated as the PSI Candidate Information Bulletin states them; the bulletin on file was updated in July 2022, and candidates should confirm current figures with PSI at scheduling.
The licensing route, step by step
Step 1 – Choose the license your plant requires
Map your plant to the statute: steam at not more than 15 psi points to Low Pressure; steam above 15 psi to High Pressure; steam turbines above 15 psi and 30 horsepower, with their boilers, to Stationary Steam Engineer. Licensing follows the plant you will operate, not the title you prefer.
Step 2 – Build and document the experience
Work the 2,000-hour route, or the course route for your license: Low Pressure 400 hours plus the approved 50-hour course; High Pressure 700 hours plus the approved 75-hour course, or your low pressure license plus 400 high-pressure hours plus the course; Engineer 700 hours plus the approved 125-hour course, or your high pressure license plus 700 turbine hours with the prescribed coursework. Confirm the course and provider are Division-approved before enrolling, and file the course-credit application before enrollment, as the rule requires.
Step 3 – File within the statutory window
File the license application with the Superintendent not more than 60 nor less than 30 days before the examination, as Section 4104.19 requires. Eligibility rests on the statute’s floor – 18 or over, with the experience or accepted equivalent the application documents.
Step 4 – Schedule and sit with PSI
Schedule the examination with PSI, pay the $100 examination fee stated in the bulletin, and sit the closed-book computer-based examination – 30, 40, or 50 questions in three hours, calculator silent and non-programmable, score report at the centre.
Step 5 – Receive the license and work within it
Passing at 70 percent completes the examination step for the license sought. The license then defines the plant scope the holder operates, and the next rung’s experience clock can begin.
The statute and the rule: who does what
Ohio splits its licensing law the way mature systems do. The statute, Section 4104.19, fixes the licenses themselves – their scopes, the age floor, the one-year experience floor or its accepted equivalent, the filing window, and the Superintendent’s role as licensor. The rule, 1301:3-5-10, does the arithmetic the statute leaves open: how many hours, which courses, whose approval, and the combinations by which a lower license shortens a higher one’s route. The examination vendor’s bulletin then fixes the sitting: counts, hours, book policy, fee, and outlines.
Candidates sometimes read only one layer and plan badly from it – the statute alone suggests a single year’s experience qualifies anyone; the rule shows the hours-and-course structure the Division actually applies; the bulletin alone never mentions that course credit requires an application before enrollment. The three layers together are the route, and this guide cites each fact to its layer.
Reading the three content outlines
The bulletin’s outlines reward close reading because they are honest maps. Low Pressure distributes 30 questions across the heating plant’s working knowledge: principles and standards including combustion and draft (5), boiler devices (5), feedwater arrangement (4), valves, piping and accessories (3), heating sources (5), makeup water (3), and operating procedures (5) – a sitting in which operations and devices dominate and no topic can carry a weak candidate alone.
High Pressure spreads 40 questions across the power boiler: boiler design (9) is the single heaviest block, followed by boiler operation (7) and auxiliary support equipment (7), indicators and devices (5), combustion equipment (4), and a tail of steam-cycle, construction, fuels, pumps, and environmental control items. Stationary Steam Engineer spreads 50 across the combined plant: boiler design (7) and mathematics and formulas (7) lead, steam cycle, combustion equipment, indicators and devices, boiler operation, and auxiliary support at 4 each, turbine design at 4 with turbine associated equipment at 2, and construction, fuels, pumps, and environmental control behind. The climbs are visible: design weight grows, then mathematics arrives.
The mathematics of the engineer sitting
The Stationary Steam Engineer outline is the only one of the three that names a mathematics and formulas section – seven of its fifty questions. That section is the sitting’s gatekeeper for operator-track candidates whose craft knowledge is strong but whose formula fluency has rested since their last course. The bulletin’s reference list points the same way: the engineer references reach for plant-operation texts at textbook depth. Candidates for the engineer license should rebuild formula fluency early – pressure, temperature, expansion, efficiency, and the arithmetic of steam – rather than discovering in the final week that a seventh of the sitting is computation under time, closed book.
Closed book as a study discipline
A closed-book examination changes what preparation is. In an open-book sitting, study builds an index: know where things live. In Ohio’s sittings, study must build the store itself: definitions held exactly, sequences held in order, numbers held ready. The practical method follows – spaced recall practice over recognition reading, written rehearsal of procedures until they reproduce without the page, and timed closed-book sets that replicate the sitting’s conditions, calculator and all. The 5 to 10 unscored experimental questions add a final discipline: an unfamiliar item may be an experiment, and the candidate who treats every hard question as evidence of failure spends morale the sitting will need later.
Experience strategy: which door, and when
The two doors serve different lives. The 2,000-hour route costs nothing but time – roughly a working year of full-time operation – and suits candidates already employed at the right plant. The course routes buy time with tuition and suit candidates whose plants cannot give them the scope: the heating-plant operator who needs high-pressure hours the plant does not have, or the career-changer entering with a course and 400 hours. The combination routes reward loyalty to the ladder: Ohio credits the licensed low pressure operator’s standing toward High Pressure, and the high pressure licensee’s toward the Engineer license, so climbing rung by rung is never wasted motion.
One caution governs all routes: experience must be completed after July 1, 1998, to count, and documentation is the candidate’s burden. Hours logs, employer attestations, and course records assembled during the work are worth more than reconstructions attempted at application.
What the references tell you
The bulletin’s reference lists are a study syllabus in disguise. The operator examinations rest on the field’s standard operator texts – the low pressure and high pressure boiler texts the bulletin names, written for the American Technical Publishers tradition of operator training – while the engineer examination adds plant-operation texts at greater depth, including the turbine and plant-systems material the outline demands. A candidate whose preparation uses those texts as the theory spine, the statute and rule as the Ohio spine, and closed-book timed practice as the method, is preparing in the shape the bulletin describes.
Failure, retakes, and the second sitting
The bulletin states the score report is issued at the test centre, so a failing candidate leaves knowing the result and the domains the report identifies as weak. The productive response is diagnostic: rebuild the weak domains rather than re-sitting quickly on general review, because a closed-book examination punishes the same gaps identically the second time. Candidates should confirm PSI’s current retake and rescheduling terms at booking, since those terms live in the vendor’s current bulletin rather than in the statute or rule this guide cites.
Ohio among the operator states
Ohio’s structure sits between the seal states and the certificate states. Like New Jersey, it ladders licenses by plant power and rewards licensed progression; unlike New Jersey, it examines closed book through a national vendor and publishes exact question counts. Like New Mexico, it lets approved training shorten the experience road; unlike New Mexico, its hours are counted in thousands and its passing score is printed for every license. For the operator labour market of the industrial Midwest, the Ohio licenses are legible currency: three named grades, a known vendor, a known standard.
The administrative map: Superintendent, Division, and vendor
Ohio’s route crosses three organisations, and candidates who cannot say which one owns which step misdirect their questions and their paperwork. The Superintendent of Industrial Compliance, in the Department of Commerce’s Division of Industrial Compliance, is the licensor: applications are filed with the Superintendent, licenses issue from that office, experience equivalence is accepted or refused there, and courses and course providers are approved by the Division. The PSI organisation is the examination vendor: scheduling, the test centre, the $100 examination fee, the score report, and the candidate bulletin’s published outlines belong to its side of the counter. The approved course providers – career centres, technical colleges, and training organisations the Division has approved – own the third step, and their approval status is a Division question, not a vendor question.
The practical map follows. Experience and course questions go to the Division before money is spent. Sitting questions – dates, centres, identification, the calculator rule – go to PSI at scheduling. The filing window is statutory and belongs to neither: 30 to 60 days before the examination, counted by the candidate. A candidacy run on this map wastes no motion; a candidacy that asks the vendor to approve a course, or the Division to move a sitting, discovers the map by refusal.
Building turbine experience for the engineer license
The Stationary Steam Engineer license is the only Ohio license whose scope is a machine other than the boiler, and its experience routes are written around that fact. The candidate may arrive with 700 hours of qualifying experience plus the approved 125-hour course, or – the route most working engineers actually climb – with a current high pressure license plus 700 additional hours of steam turbine operating experience with the coursework the rule prescribes for that path. Turbine hours are the scarce currency: they exist only where turbines over 30 horsepower run, which in Ohio means power plants, larger industrial cogeneration, and institutional plants with generation.
The high pressure operator who intends the engineer license should therefore plan postings, not merely hours: seek the plant with a turbine, seek turbine duties within it, and log the turbine experience as its own record rather than letting it dissolve into general plant time. The 50-question engineer sitting then examines what those hours were supposed to teach – turbine design, turbine associated equipment, and the mathematics section – and the candidate whose turbine time was real meets a paper that reads like the plant. The candidate who assembled paper hours meets it as a stranger.
Where each license works: heating plant, power plant, turbine floor
The three licenses partition Ohio’s steam world by workplace, and a candidate choosing a rung – or an employer staffing a plant – should be able to draw the partition without the statute in hand. The Low Pressure license belongs to the heating plant: the school, hospital, office, and apartment boilers at not more than 15 psi, where the craft is combustion, feedwater, and the daily round, and where the 30-question sitting concentrates. The High Pressure license belongs to the power boiler room: process steam and generation feed above 15 psi, where design and auxiliaries dominate the 40-question paper and the plant’s consequences scale with its pressure. The Stationary Steam Engineer license belongs to the turbine floor and the plant that feeds it, where the 50-question paper adds turbine design and mathematics because the workplace adds rotating generation machinery and its calculations.
The partition also describes careers geographically. Ohio’s heating plants are everywhere; its turbine floors are concentrated in power stations, large industry, and big institutions. An operator’s climb from the first license to the third is therefore often a change of employer and city as well as of grade, and the experience routes – which credit the lower license toward the higher – are written for exactly that migration. Candidates should read postings with the licenses’ scopes in mind: the license named in a posting is the employer stating which of the three workplaces the job is in.
After a failed sitting: reading the score report like an engineer
Ohio’s arrangement – score report issued at the test centre – gives the failing candidate an immediate, domain-level account of the sitting, and the productive response begins with reading it as data rather than verdict. The report’s weak domains should be mapped against the bulletin’s outline weights before any study resumes: a weak domain worth nine questions (High Pressure boiler design, say) is a different problem from a weak domain worth two, and the retake plan should be sized by recoverable questions, not by embarrassment. The closed-book character of the examination adds a diagnostic distinction worth making honestly: items missed because the knowledge was absent require study; items missed because the knowledge was present but not retrievable under time require recall drill; items missed in the mathematics section of the engineer paper require computation practice, which is a third remedy again.
The candidate should also confirm PSI’s current retake terms – scheduling, any waiting period, and fees – from the current bulletin at rebooking, since those are vendor terms rather than rule text. What the route does not require after a failure is new experience: the license application and its documented hours stand on their own footing, and the candidate’s task between sittings is narrower and more hopeful than the whole route – convert the report’s map into points, domain by domain, until the 70 percent line is crossed with margin.
A note on bulletin currency
The PSI bulletin this guide relies on was updated in July 2022, and vendor bulletins are living documents: fees, scheduling mechanics, and identification requirements can move between editions even when question counts and outlines hold steady. The Division’s rule and the statute change on public notice and are the stable layer; the bulletin is the operational layer. Candidates should download the current bulletin when they file, confirm the figures this guide attributes to it, and treat any difference as the current bulletin governing. That single habit – primary rule for the route, current bulletin for the sitting – generalises to every vendor-examined license in this family. It also protects the candidate’s money and calendar: the bulletin is where examination fees, rescheduling terms, and test-centre rules live, and reading its current edition before paying or booking is the cheapest verification in the entire Ohio route.
A preparation plan for each rung
Low Pressure candidates: build the heating plant whole – devices, feedwater, combustion and draft, operating procedures – with definitions exact, since 30 questions leave nowhere for a weak domain to hide. High Pressure candidates: weight design, operation, and auxiliaries as the outline weights them, and treat indicators and devices as scoring territory, not detail. Engineer candidates: add turbine design and associated equipment to the boiler core, and put formula fluency on a daily drill from the first week.
All candidates: practise closed book and timed from early in the plan, file inside the statutory window, and – if the course route is yours – secure Division approval and file the course application before enrolling. The companion PassProfessor program page describes the preparation program itself, which is in the works; this guide stands alone as the route reference for Ohio’s three licenses.
Frequently asked questions
What is the difference between the statute and the rule in Ohio licensing?
Section 4104.19 of the Revised Code creates the three licenses, sets their scopes, the age floor of 18, the one-year experience floor or its accepted equivalent, and the filing window. Rule 1301:3-5-10 of the Administrative Code sets the working experience structure: 2,000 hours or the course routes, approvals, and combinations.
Why does the rule mention July 1, 1998?
Experience offered for licensure must, with limited exception, have been completed after July 1, 1998, under rule 1301:3-5-10 – experience older than that date generally cannot be counted toward the requirement.
What topics dominate the Low Pressure examination?
Per the PSI outline: operating procedures, boiler devices, and combustion and draft within principles and standards, and heating sources – 5 questions each of 30 – with feedwater arrangement at 4, makeup water at 3, and valves, piping, and accessories at 3.
What topics dominate the High Pressure examination?
Boiler design at 9 of 40 questions, boiler operation and auxiliary support equipment at 7 each, and indicators and devices at 5, per the PSI outline.
What is new on the Stationary Steam Engineer examination?
Steam turbine design and turbine associated equipment enter the field, and the outline adds an explicit mathematics and formulas section of 7 questions out of 50, per the PSI bulletin.
Does Ohio require a practical examination?
The route the statute, rule, and PSI bulletin describe is a written, computer-based examination for each license. No practical component is published in those sources for these licenses.
Can experience substitute for the course, or the course for experience?
Only in the combinations the rule prints: hours alone at 2,000, or the specified hours-plus-course pairings. There is no general substitution clause in the rule as read.
Who approves courses for experience credit?
The Division of Industrial Compliance approves both course providers and the courses themselves; hours from unapproved courses do not count, and the candidate applies for course credit before enrolling.
What are experimental questions on the PSI examinations?
The bulletin states that 5 to 10 unscored experimental questions may be added to test new items; they do not count toward the candidate’s result and are not identified in the sitting.
Can a licensed low pressure operator reach the engineer license directly?
The rule’s engineer combinations run through the high pressure license plus turbine experience, or through 700 hours plus the 125-hour approved course. The low pressure license shortens the High Pressure route expressly; the engineer route builds from there.
Where do this guide’s facts come from?
From Section 4104.19 of the Ohio Revised Code, rule 1301:3-5-10 of the Ohio Administrative Code, and the PSI Candidate Information Bulletin for these examinations, as published by Ohio State sources and PSI, recorded in this file’s INTERNAL section.