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The Path to G3 Certification. (Gas Technician 3)
The G3 license represents the entry point into Ontario's gas technician profession. As the foundational certification in the HVAC industry, it provides essential skills and knowledge for working safely with gas appliances in residential settings.
Understanding the G3 License
The G3 certification [Gas Technician 3] is regulated by Ontario's Technical Standards and Safety Authority (TSSA). This entry-level license enables technicians to perform basic gas appliance work under proper supervision and within specific scope limitations.
With G3 certification, you can begin working with gas appliances including basic furnace maintenance, water heater servicing, and other residential gas equipment within the prescribed limits.
Ideal Candidates for G3 Certification
The G3 license is designed for:
• New entrants to the HVAC industry
• Students completing gas technician programs
• Individuals seeking to start their gas technician career path
• Those planning to advance to G2 certification later
This certification provides the foundation for building expertise in gas appliance technology.
G3 License Scope and Limitations
G3 certified technicians can:
• Perform basic maintenance on gas appliances
• Work under supervision of higher-level technicians
• Handle appliances within specific BTU limitations
• Gain valuable hands-on experience in the field
Typical work includes:
• Basic furnace maintenance and cleaning
• Simple water heater servicing
• Routine appliance inspections
• Assisting with installations under supervision
Prerequisites for G3 Certification
To obtain your G3 license, you need:
• Completion of a TSSA-approved G3 training course
• Successful completion of the G3 written examination
• Meeting all TSSA application requirements
Note: G3 is typically the starting point before advancing to G2 certification
G3 Exam Format and Structure
Understanding the G3 exam format helps reduce test anxiety and improves your chances of success. The exam tests fundamental knowledge of gas appliance safety, basic operations and industry regulations.
Here's what you need to know about the G3 examination structure and requirements.
G3 Exam Question Format
• Multiple-choice format with clear answer options
• Questions focus on fundamental gas safety principles
• Covers basic appliance operation and maintenance
• Written exam only - no practical component required
G3 Exam Time and Length
• 2.5 hours allocated for completion
• Approximately 80 to 120 questions
Pace yourself - allow roughly 1-2 minutes per question with time for review
G3 Exam Passing Requirements
• Minimum 70% score required to pass
• Results provided by TSSA after grading
Retake options available if needed (with mandatory waiting period between attempts)
Ready to test your G3 knowledge?
Take a comprehensive G3 practice test - created from our extensive question bank covering all exam topics.
Our G3 practice tests simulate the actual exam experience and help identify knowledge gaps. With your subscription, you get unlimited G3 practice tests plus detailed explanations!
G3 Exam Day Preparation
Proper preparation for your G3 exam day goes beyond studying the material. Understanding the testing environment and procedures helps ensure you can focus entirely on demonstrating your knowledge.
Here's your complete guide to G3 exam day success:
Pre-Exam Preparation
• Bring government-issued photo identification
• Plan to arrive 20-30 minutes before your scheduled time
• Exams are conducted at TSSA-approved testing facilities
• Confirm your exam location and parking availability in advance
Secure personal belongings (phones, bags) in designated storage areas before entering
During Your G3 Exam
• Testing occurs in a monitored, quiet environment
• You'll receive either a paper test booklet or computer access
• Reference materials are generally not permitted (confirm with your testing center)
• Basic materials like pencils and scratch paper are typically provided
Raise your hand if you need assistance or have questions during the exam
Post-Exam Process
• Complete all required paperwork before leaving
• Exam results are sent directly from TSSA
Successful candidates will receive G3 license processing information
If unsuccessful, you can schedule a retake after the required waiting period
Pro Tip:
Consistent study over several weeks beats cramming.
Focus on understanding concepts rather than memorizing answers.
G3 Practice Question Examples
These sample questions represent the style and content you'll encounter on the G3 exam and within our comprehensive G3 study materials.
Sign up for FREE ( click here ) to get a better look at the full test environment with loads of customization and advanced features.
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G3 Training Program Locations
TSSA Approved G3 Training Providers
Ontario has over 20 TSSA-accredited institutions offering G3 training programs. These programs provide the foundational knowledge and hands-on experience required for G3 certification.
Here are some of the more popular G3 training & certification providers:
Conestoga College
299 DOON VALLEY RD, KITCHENER, ON, N2P 1B5, Canada
1382221 Ontario Limited O/A Great Lakes College Of Science And Technology
2977 ST ETIENNE BLVD, UNIT 200, WINDSOR, ON, N8W 5B1, Canada
Hi Mark Occupational Skills Training Centre Ltd
92 BRYDON DR, TORONTO, ON, M9W 4N6, Canada
United Association - Local 527 (Jtac)
3429 ST ETIENNE BLVD, WINDSOR, ON, N8W 5B1, Canada
United Association - Local 527 (Jtac)
331 SOVEREIGN RD, LONDON, ON, N6M 1A6, Canada
Algonquin College- Woodroffe Campus
225 Frobisher Dr, Waterloo, ON, N2V 2G4, Canada
Niagara Skilled Trades Academy
227 BUNTING RD, C1, ST CATHARINES, ON, L2M 3Y2, Canada
Halton Skilled Trades Academy Div Of Niagara Skilled Trades Academy
2416 WYECROFT RD, OAKVILLE, ON, L6L 6M6, Canada
Hi Mark Occupational Skills Training Centre Ltd
2520 TRAFALGAR ST, LONDON, ON, N6M 1G9, Canada
Stanford International College
930 PROGRESS AVE, SCARBOROUGH, ON, M1G 3T5, Canada
The Humber College Institute Of Technology And Advanced Learning
205 Humber College Blvd, Toronto, ON, M9W 5L7, Canada
Stanford International College
1011 EGLINTON AVE E, UNIT 7, MISSISSAUGA, ON, L4W 1K4, Canada
Hi Mark Occupational Skills Training Centre Ltd
2508 DEL ZOTTO AVE, OTTAWA, ON, K1T 3V7, Canada
Hi Mark Occupational Skills Training Centre Ltd
2938 HWY 11 SOUTH, ORO, ON, L0L 2X0, Canada
La Cite Collegiale
801 AVIATION PKY, OTTAWA, ON, K1K 4R3, Canada
Joint Training & Apprenticeship Committee Local 787
419 DEERHURST DR, BRAMPTON, ON, L6T 5K3, Canada
Herzing Institutes Of Canada Ltd O/A Herzing College
11 KODIAK CRES, TORONTO, ON, M3J 3E5, Canada
Canadore College Of Applied Arts And Technology
100 COLLEGE DR, PARRY SOUND, ON, P2A 2M7, Canada
George Brown College
200 KING ST E, PO BOX 1015, STN B, TORONTO, ON, M5T 2T9, Canada
Stanford International College
25 SCARSDALE RD, UNIT 8 & 9, TORONTO, ON, M3B 2R2, Canada
Hi Mark Occupational Skills Training Centre Ltd
427 DUNDAS ST N, CAMBRIDGE, ON, N1R 5R5, Canada