California CSLB C-4 — Boiler & Steam Fitting Exam Prep

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Your access starts when you do: the days begin the first time you open the course, not at checkout (or 14 days after purchase, whichever comes first).

Business & Law is 75% off with this classification. Add it only if you want it, for the same term: $24.75 for 30 days, $32.25 for 60 days, $42.25 for 90 days.

Official sitting

California CSLB C-4 Boiler & Steam Fitting exam at a glance

The California CSLB C-4 Boiler & Steam Fitting exam has a time limit of 3 hours 30 minutes, and it is closed book. CSLB also requires a separate Law and Business exam. Figures are from CSLB’s published exam information.

Time3 hours 30 minutes

Confirm question count, time, open-book rules, and passing score on the live board bulletin before you sit. We do not guarantee a passing result. Source: CSLB C04StudyGuide.pdf (on/after 3/1/2024). How we source exam facts

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What’s included

18,000+ word study guide

Worked calculations, code-section breakdowns, exam traps, a key-terms glossary and a 30/60/90-day plan.

5 full-length practice exams

Original questions weighted to match the topic mix of the real exam.

500 practice questions

Every one with a written explanation and the code section behind the answer.

Same study guide and four exams on every term. You are choosing how long you can log in.

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What’s on the California CSLB C-4 Boiler & Steam Fitting exam

CSLB’s study guide divides the C-4 exam into five weighted sections. Boiler System Removal, Preparation, and Installation carries the most weight at 29%, and together with Boiler System Maintenance, Repair, and Retrofit (22%) it makes up 51% of the exam. Planning and Estimating is the smallest share at 15%.

California CSLB C-4 Boiler & Steam Fitting exam sections and their share of the exam
SectionShare of exam
Planning and Estimating15%
Boiler System Removal, Preparation, and Installation29%
Specialty Boiler Installation17%
Boiler System Maintenance, Repair, and Retrofit22%
Safety17%

The C-4 exam is closed book: no reference materials may be used during the test. Questions are multiple choice with four options, and there is no penalty for guessing, so leave nothing blank.

Source: CSLB Boiler, Hot-Water Heating and Steam Fitting (C-4) examination study guide. These weightings are the Board’s own, not our estimate. Contractor Pathway is independent and not affiliated with or endorsed by CSLB.

What this prep covers

  1. 1 ASME Boiler and Pressure Vessel Code (BPVC) — Structure and Scope
  2. 2 California Boiler and Pressure Vessel Regulations — Title 8, Division 5
  3. 3 Boiler Classifications and Pressure Thresholds
  4. 5 Boiler Piping Codes
  5. 3 Insurance Requirements
  6. 6 Change Orders
  7. 9 Permits and Building Codes
  8. 4 Piping Systems — Steam, Condensate, and Hydronic
  9. 7 Boiler Installation Requirements
  10. 1 Boiler Types and Construction
  11. 3 Hydronic Heating Systems
  12. 4 Home Improvement Contracts — B&P Code Section 7159
  13. 9 Radiant Floor Heating
  14. 10 Boiler Efficiency and Energy Codes
  15. 4 Lockout/Tagout (LOTO) — Title 8, Section 3314
  16. 5 Water Treatment for Boilers
  17. 2 Steam System Components
  18. 6 Combustion and Efficiency
  19. 4 Safety Valves and Pressure Relief Devices
  20. 6 Boiler Registration and Documentation
  21. 8 Boiler Controls and Safety Devices
  22. 1 Cal/OSHA Boiler Safety Requirements
  23. 2 Confined Space Entry — Title 8, Section 5157
  24. 1 Contractor Licensing Requirements
  25. 2 Contractor Bond Requirements
  26. 5 Mechanics Lien Law — California Civil Code Sections 8000-8848
  27. 7 Advertising and Representations
  28. 8 Grounds for Disciplinary Action
  29. 10 License Renewal and Continuing Education
  30. 6 Personal Protective Equipment (PPE)
  31. 3 Hot Work — Title 8, Section 4848
  32. 5 Injury and Illness Prevention Program (IIPP) — Title 8, Section 3203
  33. 7 Fall Protection
  34. 1 Sample Questions by Subject Area
  35. 2 Exam-Day Strategies
  36. 3 Key Numbers to Memorize

Related California CSLB exams

Common questions about this exam

Do I also need the Law and Business exam in California?

Yes. CSLB requires every applicant to pass the separate Law and Business exam in addition to the C-4 trade exam. That exam has 3 hours 30 minutes. California CSLB Law & Business prep is 75% off when you add it to this classification for the same term.

How much practice does this prep include?

It includes 5 full-length practice exams and 500 practice questions in total. Every question has a written explanation naming the code section the answer comes from.

How long is the study guide?

The California CSLB C-4 Boiler & Steam Fitting guide runs to roughly 18,066 words in 36 sections, starting with “1 ASME Boiler and Pressure Vessel Code (BPVC) — Structure and Scope” and ending with “3 Key Numbers to Memorize”.

How long do I get access?

Choose 30, 60 or 90 days at checkout. Your days do not start at checkout: they begin the first time you open the course (or 14 days after purchase, whichever comes first). Access works on any device, and you can retake every practice exam as often as you like. Days remaining are shown in your dashboard and you can extend at any time.

Is this an official California CSLB C-4 Boiler & Steam Fitting exam?

No. This is independent preparation material. It is not affiliated with or endorsed by any state licensing board or exam vendor, and it does not contain real exam questions. Always confirm current requirements with your licensing board.

About this prep

This prep is built specifically for the C-4 — Boiler & Steam Fitting examination and includes a 18,000+-word study guide written for this exam, 5 full-length practice exams and 500 practice questions, each with a written explanation.

How access works

You are paying for access length (30, 60, or 90 days). The study guide and four timed exams are the same on every term. Your days start the first time you open the course, not at checkout (or 14 days after purchase, whichever comes first), and access works on any device for that term.

Not affiliated with or endorsed by any state licensing board or exam vendor. For exam-preparation purposes only.