Gasfitter — Class B
Install and service residential gas appliances and equipment up to 400,000 BTU input.
About Gasfitter — Class B
Class B Gasfitters install and service residential gas appliances and equipment up to 400,000 BTU input. They work with natural gas and propane systems for heating, water heating, cooking, and other residential applications.
Work Environment
Class B Gasfitters primarily work in residential settings, installing and servicing home heating systems, water heaters, fireplaces, and cooking appliances. They work in mechanical rooms, basements, and attics.
Physical Demands
- Working in residential crawlspaces and attics
- Lifting appliances and pipe
- Kneeling and bending for floor-level work
- Working in occupied homes
- Attention to detail for leak testing
Designated Provinces & Territories
Red Seal Exam Structure
The Gasfitter — Class B Red Seal exam consists of 100 multiple-choice questions covering 5 major work activity areas.
Total Questions
Multiple choice
5–15%
Knowledge & Recall
60–70%
Procedural Application
20–30%
Critical Thinking
Skills for Success
The essential skills required to succeed in this trade, as defined by the Red Seal program.
Reading
Read technical manuals, code books, specifications, and safety documentation related to residential gas fitting.
Document Use
Interpret blueprints, schematics, drawings, and technical documents used in residential gas fitting.
Writing
Complete work orders, reports, inspection records, and other documentation for residential gas fitting.
Oral Communication
Communicate with clients, colleagues, supervisors, and other trades to coordinate residential gas fitting work.
Numeracy
Perform measurements, calculations, and estimates required for residential gas fitting tasks.
Thinking
Apply problem-solving and critical thinking skills to diagnose issues and plan residential gas fitting work.
Working with Others
Collaborate with team members, apprentices, and other trades on residential gas fitting projects.
Digital Technology
Use digital tools, diagnostic software, and computer-based systems relevant to residential gas fitting.
Continuous Learning
Stay current with evolving codes, technologies, and best practices in residential gas fitting.
Career Advancement
Class B gasfitters can upgrade to Class A certification or advance to service manager. Many operate their own residential gas service businesses.
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