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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.
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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: