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How to become a licensed Boiler Operator in Maine. State license required. Total initial fees: $60-$90. Verified 2026-03-21. Data verified 2026-03-21. Source: LicenseMap (getlicensemap.com).
Boiler Operator — BO
Governing Authority
Maine Department of Professional and Financial Regulation — Boiler and Pressure Vessel Program
Official website →Some information on this page has not been fully verified.
7% of data points are verified against official sources. 38 fields based on preliminary research. We recommend confirming details with your state's licensing authority. See sources below · Report incorrect data
Yes
License Required
5
License Grades
Yes
Exam Required
$60-$90
Total Initial Fees
Annual
Renewal Period
No
CE Required
Maine boiler operator licensing overview
Mostly verifiedRequired
State License
5
License Grades/Classes
18+
Minimum Age
License Grades / Classes
Low Pressure Engineer
For operating low-pressure heating boilers
Experience: Basic boiler operation knowledge
Boiler Types: Low-pressure steam (15 psi max) and hot water boilers
4th Class Stationary Engineer
For operating boilers up to 50 HP
Experience: 6 months experience
Boiler Types: Boilers up to 50 HP
3rd Class Stationary Engineer
For operating boilers up to 100 HP
Experience: 1 year experience
Boiler Types: Boilers up to 100 HP
2nd Class Stationary Engineer
For operating boilers up to 500 HP
Experience: 2 years experience
Boiler Types: Boilers up to 500 HP
1st Class Stationary Engineer
Unlimited boiler operation
Experience: 3+ years experience
Boiler Types: All boilers, unlimited HP
Boiler operator licensing requirements vary significantly by state. Some states require multiple grades of licenses based on boiler size and pressure rating, while others do not require a state-level license at all. The ASME Boiler and Pressure Vessel Code provides the national standard for boiler safety. Always verify current requirements with your state licensing authority.
Education, experience, and training requirements
Mostly verifiedEducation Required
High school diploma or equivalent
Experience Required
6 months to 3+ years depending on license class
Apprenticeship
Not Required
Training Programs
On-the-job training under a licensed engineer; approved training courses
Boiler operator training typically combines classroom instruction with hands-on experience. Many states require a combination of formal education and documented operating experience before licensure. The National Board of Boiler and Pressure Vessel Inspectors (NBBI) and industry associations offer additional training and certification programs.
Examination requirements and details
Mostly verifiedExam Required
Yes
Exam Provider
Maine Board of Stationary Steam Engineers and Boiler Operators
Passing Score
70%
Exam Details
Written examination covering boiler operation, safety, ASME codes, and Maine regulations
Retake Policy
May retake after 30 days
Applicable Codes & Standards
ASME Boiler and Pressure Vessel Code
Boiler operator examinations typically cover ASME Boiler and Pressure Vessel Code, boiler operation principles, safety procedures, and state-specific regulations. Some states use examinations from the National Institute for the Uniform Licensing of Power Engineers (NIULPE), while others administer their own exams.
Insurance and bonding requirements
Mostly verifiedInsurance Required
No
Bonding Required
No
Most states do not require individual boiler operators to carry personal insurance or bonding. Employers typically carry workers' compensation and general liability insurance that covers boiler operations. Facilities with boilers are generally required to have boiler and machinery insurance.
| Fee | Amount |
|---|---|
License Fee Maine boiler operator license fee | $30 |
Exam Fee Examination fee | $30 |
Renewal Fee Renewal fee per cycle | $30 |
Total Initial Fees Total estimated initial costs including license and exam fees | $60-$90 |
Renewal requirements and ongoing obligations
Mostly verifiedAnnual
Renewal Period
Not Required
Continuing Education
N/A
CE Hours per Cycle
Renewal Fee
$30
Regulatory Board
Renewal requirements vary by state. Most states that license boiler operators require annual or biennial renewal. A few states require continuing education to maintain licensure. Failure to renew on time may result in lapse of license and the need to retake examinations.
Maine has one of the most structured boiler operator licensing programs in New England, with five distinct license classes.
Maine has a comprehensive boiler operator licensing program with 5 levels from low-pressure to 1st Class.
The Board of Stationary Steam Engineers and Boiler Operators administers examinations and issues licenses.
All high-pressure boiler plants must have a licensed engineer on duty.
There is no interstate compact for boiler operators.
Explore requirements for other professional licenses in Maine.
How this state compares to 50 others for this profession
Salary
#29 of 51
Based on May 2024 Bureau of Labor Statistics OEWS data for Stationary Engineers and Boiler Operators (SOC 51-8021)
Entry Level
N/A
25th percentile
Median
$60,200
-9% vs. national avg ($65,850)Experienced
N/A
75th percentile
Wage Distribution (Annual)
Source: BLS OEWS – Stationary Engineers and Boiler Operators (May 2024)
National employment projections for 2022-2032
Projected Growth
+2%
Average GrowthNew Jobs
N/A
over 10 years
Annual Openings
N/A
per year (avg.)
N/A currently employed nationwide (2024)
Source: BLS Employment Projections 2022-2032 (September 2023)
Government fees and exam costs to obtain your initial license
Note: These are government licensing fees only. Education/training program costs (tuition, books, etc.) are not included as they vary widely by institution.
Source: Maine Department of Professional and Financial Regulation — Boiler and Pressure Vessel Program
Estimated total: 4–12 weeks
Timeline estimated from licensing requirements on this page.
Source: Maine Department of Professional and Financial Regulation — Boiler and Pressure Vessel Program
4–12 weeks
Estimated processing time
Source: Maine Department of Professional and Financial Regulation — Boiler and Pressure Vessel Program
Study guides and practice tests for boiler operator licensing exams.
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Maine requires boiler operators to hold a state license. 5 license grade(s) are available for different boiler types and capacities. Boiler safety in Maine is overseen by the Maine Department of Professional and Financial Regulation — Boiler and Pressure Vessel Program.
Requirements vary by state. Always verify current requirements with your state licensing authority.