Free TSSA G3 Exam Prep
TSSA Gas Technician 3 (G.3 / G3) Certificate of Qualification — Ontario
Prepare for the TSSA G3 exam without spending hundreds on expensive prep courses. Free study guides, practice questions, flashcards, and related exam resources.
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TSSA TSSA Gas and Oil Burner Technician Exams (Ontario): Study Roadmap
Follow this path to organize your exam preparation
Module 1–3: Safety, Tools & Fuel Gas PropertiesYou are here
Master personal protective equipment, WHMIS, hand/power tools, manometers, combustion chemistry, and specific gravity differences between natural gas and propane.
Module 4: Codes, Regulations & G.3 Scope
Learn the Technical Standards and Safety Act, the G.3 scope in O. Reg. 215/01 s. 22, O. Reg. 212/01 unacceptable-condition procedures, O. Reg. 211/01, the 2026 Code Adoption Document, and CSA B149.1-25 navigation.
Module 5–7: Electricity, Manuals & Customer Relations
Understand Ohm's law, 120V line vs. 24V control circuits, transformers, ladder schematics, rating plate data, piping drawings, and professional client communication.
Module 8: Piping & Tubing Systems
Study piping materials (steel, copper, CSST, PE), threaded/flared joining, support spacing, dirt and drip pockets, sizing with Annex A/B tables, pressure testing and the Ontario test tag (Clause 6.22), and purging (Clause 6.23).
Module 9: Gas Appliances, Burners & Safeguards
Examine appliance categories I–IV, atmospheric vs. power burners, ignition sequences (HSI/DSI/standing pilot), thermocouple/flame rod supervision, Clause 8 air-supply tables, and vent termination clearances.
Can You Take the TSSA G3 Exam?
Check if you meet the basic eligibility requirements
- •Accredited training providers typically require ≥80% attendance
- •Bring permitted unmarked codes/regulations to the written exam
- •Government-issued photo ID required on exam day
TSSA G3 Quick Facts
Exam Provider
TSSA (Fuels Safety — examination centres / Prometric as scheduled by TSSA)
Retake Policy
Fuels candidates who do not pass may re-write after 30 days (TSSA Certification Examination Preparation Guide).
Free TSSA G3 Prep Tools
100+ Practice Questions
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What You'll Study
12 chapters covering the exam topics in this guide
Chapter 1: Safety & Workplace Practices
3 sections
Chapter 2: Fasteners, Hand Tools & Power Tools
2 sections
Chapter 3: Testing Instruments & Diagnostics
2 sections
Chapter 4: Fuel Gas Properties & Combustion Principles
3 sections
Chapter 5: Ontario Acts, Regulations & G.3 Scope of Authority
3 sections
Chapter 6: CSA B149 Code Navigation & General Requirements
2 sections
Chapter 7: Introduction to Electricity & Electrical Safety
3 sections
Chapter 8: Technical Manuals, Specifications & Architectural Drawings
2 sections
Chapter 9: Customer Relations, Professional Conduct & Documentation
2 sections
Chapter 10: Piping & Tubing Systems: Materials, Joining & Installation
3 sections
Chapter 11: Gas Pipe Sizing, Pressure Testing & Purging Procedures
3 sections
Chapter 12: Gas Appliances, Burners & Combustion Air Fundamentals
4 sections
TSSA G3 Exam Details
TSSA Gas Technician 3 (G.3 / G3) Certificate of Qualification — Ontario
Administered by Technical Standards and Safety Authority (TSSA)
Exam Content Breakdown
Based on the official Technical Standards and Safety Authority (TSSA) content outline
Module 1: personal protective equipment, hazard recognition, fire/explosion prevention, WHMIS/GHS awareness, lockout/tagout concepts, and safe work around fuel gases.
Module 2: hand/power tools for gas work, fasteners, manometers/gauges, leak-detection methods, and proper instrument use/care.
Module 3: natural gas and propane properties, specific gravity, flammability limits, combustion triangle, odorization awareness, and safe handling differences.
Module 4: Technical Standards and Safety Act, O. Reg. 215/01 Fuel Industry Certificates, O. Reg. 212/01 (Gaseous Fuels) and O. Reg. 211/01 (Propane Storage and Handling), Code Adoption Documents (CSA B149.1-25 in force from June 1, 2026), CSA B149.2, G.3 scope (supervised work), and permitted exam references.
Module 5: basic electrical concepts for gas equipment, series/parallel circuits, voltage/current/resistance, transformers, and safe electrical practices around appliances.
Module 6: reading manufacturer manuals, nameplates, ratings plates, and basic installation drawings/specifications.
Module 7: professional communication, documenting work, explaining safety notices, and working courteously under supervision.
Module 8: piping/tubing materials, joints, supports, drip legs/dirt pockets, sizing awareness, leak testing, purging concepts, and shut-off valves within G3 training scope.
Module 9: appliance types, approval marks, clearances, combustion air/venting awareness, ignition and flame supervision basics, and start-up/shutdown under supervision.
What's Included
12 Chapters
Complete exam coverage
Practice Quizzes
With detailed explanations
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What's Next After the TSSA G3?
After passing the TSSA G3, you can pursue these career paths
TSSA Gas Technician 2 (G.2)
Next step: G.2 — install and service appliances of 400,000 Btu/h or less without supervision; entry requires the G.3 plus accredited G.3 training or 450 documented hours of G.3 work
Red Seal Gasfitter — Class B
Related interprovincial gasfitter credential covering installation and service of gas systems up to 400,000 Btu/h
TSSA G3 Exam FAQ
Official Technical Standards and Safety Authority (TSSA) Resources
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