Understanding the TSSA G3 Certification
What is the G3 License?
The Gas Technician 3 (G3) license is your entry point into the gas fitting profession in Ontario. This certification allows you to:
- Install and service gas appliances up to 100,000 BTU/hr input
- Work on residential gas systems and appliances
- Perform basic gas piping and connections
- Begin building experience toward G2 certification
G3 Exam Requirements
To take the TSSA G3 exam, you must:
- Complete an approved gas technician training program
- Be at least 18 years old
- Pass a pre-examination medical (if required)
- Pay the examination fee ($100 as of 2025)
💡 Why G3 is Your Perfect Starting Point
The G3 certification provides excellent earning potential while you gain experience. Many technicians work successfully for years with just a G3 license, and it's the required foundation for advancing to G2 and G1 certifications.
G3 Exam Format and Content
The TSSA G3 exam consists of 100 multiple-choice questions covering 9 main units:
- Unit 1: Safety protocols and regulations (15%)
- Unit 2: Tools and equipment (10%)
- Unit 3: Gas properties and combustion (12%)
- Unit 4: Codes and regulations (18%)
- Unit 5: Basic electricity (10%)
- Unit 6: Technical drawings and manuals (8%)
- Unit 7: Customer relations (7%)
- Unit 8: Gas piping systems (10%)
- Unit 9: Gas appliances (10%)
Complete Free Study Resources
LARK Labs is committed to supporting Canadian gas technician students with completely free G3 preparation materials:
🚀 100% Free TSSA G3 Study System
Everything you need to pass the G3 exam - completely free for Canadian students
Free G3 Practice Exam Free Code Search Free Study MaterialsFree Practice Exam Simulator
Our TSSA G3 Exam Simulator provides:
- Realistic 100-question practice exams
- Questions covering all 9 units
- Instant feedback and explanations
- Multiple practice sessions
- Mobile-friendly format for studying anywhere
Free Chapter Review Questions
Master each unit with our comprehensive chapter-by-chapter study guides:
Unit 1 - Safety
On-the-job safety, government acts, hazardous materials, and fire safety protocols
Unit 2 - Tools & Equipment
Fasteners, hand tools, power tools, and measuring instruments
Unit 3 - Gas Properties
Fuel gas properties, combustion principles, and gas hazards
Unit 4 & 4a - Codes
Utilization codes, acts, regulations, and Ontario supplement
Unit 5 - Basic Electricity
Electrical safety, theory, circuits, and testing instruments
Unit 6 - Technical Drawings
Technical drawings, reference manuals, and graph interpretation
Unit 7 - Customer Relations
Professional communication and customer service skills
Unit 8 - Gas Piping
Gas piping materials, installation methods, and system components
Unit 9 - Gas Appliances
Gas appliance types, components, operation, and safety features
Free Code Search Tool
Navigate codes and regulations efficiently with our Code Compass tool:
- FREE version includes: All TSSA Act and Ontario Regulations plus limited sections 1-4 of CSA B149.1 and B149.2 codes
- Premium version ($79): Complete code search with AI explanations and learning tools for all CSA B149.1/B149.2 content
- Mobile-optimized for field reference
- No registration required for free features
Free HVAC Calculators
Support your studies with professional-grade calculation tools:
- Heat Load Calculator - Size heating systems properly
- P-T Charts - Refrigeration pressure-temperature references
- Unit Converter - Imperial/metric conversions
- Duct Sizing - Proper ductwork calculations
Proven Study Strategies for G3 Success
6-Week Study Plan
📅 Recommended Study Schedule
- Week 1: Units 1-3 (Safety, Tools, Gas Properties)
- Week 2: Units 4-4a (Codes and Regulations)
- Week 3: Units 5-6 (Electricity, Technical Drawings)
- Week 4: Units 7-9 (Customer Relations, Piping, Appliances)
- Week 5: Practice exams and weak area review
- Week 6: Final review and exam preparation
Effective Study Techniques
- Start with chapter reviews: Use our free unit-by-unit questions to test your knowledge
- Take baseline practice exam: Identify your strengths and weaknesses early
- Focus on high-weight topics: Safety and codes make up 33% of the exam
- Practice code navigation: Use Code Compass to get comfortable finding information quickly
- Review every practice question: Understand why answers are correct or incorrect
Key Topics to Master
⚠️ High-Priority Study Areas
These topics appear frequently on G3 exams and are essential for safe gas work:
- Safety protocols: Personal protective equipment, hazard recognition, emergency procedures
- CSA B149.1 basics: Appliance classifications, clearance requirements, venting rules
- Gas properties: Specific gravity, heating values, combustion air requirements
- Tools and testing: Manometers, leak detection, pressure testing procedures
- Basic electricity: Ohm's law, circuit types, electrical safety
Day of Exam Success Tips
What to Bring
- Two pieces of government-issued photo ID
- Reference Materials: CSA B149.1, CSA B149.2, TSSA Act, Ontario Regulations 211/1, 223/1, 212/1, 215/1, and 213/1 (clean copies, no notes or highlighting)
- Non-programmable calculator
- Basic drawing tools (ruler, pencil)
Exam Day Strategy
- Read questions carefully: Watch for keywords like "NOT," "EXCEPT," "ALWAYS"
- Manage your time: Aim for 1.8 minutes per question
- Use elimination: Rule out obviously wrong answers first
- Trust your preparation: Your first instinct is usually correct
- Review if time permits: Check questions you marked for review
After Your G3 Certification
Career Opportunities
With your G3 certification, you can work in:
- Residential heating and cooling companies
- Appliance installation and service
- New construction gas rough-ins
- Maintenance and repair services
Path to G2 Advancement
After working with your G3 for 12 months and gaining 2,000 hours of experience, you can pursue G2 certification. When you're ready, consider our premium G2 study system for advanced preparation.
Frequently Asked Questions
Your Free Path to G3 Success
The TSSA G3 certification is your gateway to a rewarding career in the gas technician field. With LARK Labs' comprehensive free resources, you have everything needed to prepare thoroughly and pass confidently.
Our commitment to supporting Canadian gas technician students means all G3 materials remain completely free. Take advantage of these professional-grade resources and join thousands of successful G3 technicians across Ontario.
🎓 Start Your Free G3 Preparation Today
Access all our free G3 study resources and begin your journey to certification
Take Free Practice Exam Start Chapter Reviews Join CommunityQuestions about G3 preparation? Connect with other students and experienced technicians in our free Canadian HVAC Community or contact us at lark_labs@outlook.com.
Best of luck with your G3 exam! We're here to support your success with completely free resources every step of the way.