How to Become a Gas Technician in Ontario: Training & Certification

Photo: Students at Herzing College in Toronto, Ontario (2019)

Updated June, 2021

Considering a trades career as a gas fitter, domestic appliance technician, plumber, or HVAC technician?

One of the first things you should do is investigate gas certification requirements for your province or territory, and reputable gas training programs in your area.

If you're looking to become a gas technician in Ontario, it's important to understand the various levels of licensing (G1, G2, G3) and what they mean.

In this post, we break down the differences between each gas certification level, what you'll study to prepare for each exam, and what you should know about the TSSA.

Certification with TSSA is Mandatory for Gas Technicians

The Technical Standards and Safety Authority (TSSA) develops training standards and certification policies for trades in a number of sectors, including those related to fuel (oil/gas).

Their goal is to protect public safety through education and examination, performing inspections, influencing regulations, and taking action when standards have not been met.

So, anyone who wants to become a gas technician in Ontario must by certified by the TSSA. This includes fulfilling their training requirements and passing the TSSA gas technician exams.

There are different exams for G1, G2, and G3 certifications. All exams are multiple choice, and range from 50 - 165 questions, depending on the level.

You need a minimum grade of 75% to pass these exams. You also need to get at least 75% on the classroom part of your gas tech training, or the TSSA won't grant you certification.

Learn more here: 6 Things to Know About the TSSA Exams


Gas Technician Training Levels 1, 2 & 3: What's the Difference?

The different certification levels reflect varying levels of knowledge and experience for gas techs. G3 is the beginner level, followed by G2—and G1 is the highest level of certification.

Training programs to prepare for examinations are provided by trades schools, but are designed by the TSSA (to ensure standards are maintained across all programs).

At the end of training for each level, students take an exam to earn the certification—and if they pass, they can start working toward the next level.


Gas Technician 3 Certification

G3 is the starting point for technicians in Ontario. The program is divided into 9 learning modules, and takes about 12 weeks to complete.

The G3 curriculum includes both classroom theory and hands-on practice, and covers core concepts such as:

  • safe handling of propane and natural gas
  • fasteners, hand tools, and power tools
  • installation codes and regulations
  • interpreting technical manuals, specs, graphs, etc.
  • intro to gas appliances
  • intro to piping and tubing systems

With the Gas Technician 3 certification, you may work under supervision on appliances up to and including 400,000 British Thermal Units per Hour (BTUH).

Considering becoming an HVAC mechanic or plumber? You will need to earn your G3 or G2 to work in the field - so make sure preparation for the exam is included in your training program.


Gas Technician 2 Certification

G2 training picks up where level 3 finishes, taking students through more advanced levels of knowledge and practice, with a special focus on specific gas fired equipment.

The program is broken up into 15 modules, takes about 480 hours to complete, and covers topics such as:

  • advanced piping and tubing
  • understanding a building as a system
  • domestic and non-vented appliances
  • gas metres and pressure regulators
  • water heaters and combo systems
  • forced warm air heating systems
  • hydronic heating systems
  • mechanical and electric controls

With the G2 certification, you may legally work unsupervised on appliances. You will have the necessary skills and experience to install, inspect, alter, purge, activate, or repair a natural gas or propane appliance that has an input of 400,000 BTUH or less.

Level 2 gas technicians may also supervise G3 gas techs in the field.


Gas Technician 1 Certification

G1 is the highest level of certification for gas technicians. To enroll in this training program, you must show proof that you have worked in the field for at least two years as a G2.

Plus, you must demonstrate that you've had 500 hours of experience working on systems with a firing rate of more than 400,000 BTUs.


Learn more about gas technician training & certification

Want to know more about getting started with G3 certification, or progressing to level 2? Looking for reliable gas technician training in Ontario?

Explore the Gas Technician training available at Herzing College (Toronto and Cambridge).

We offer Level 2 and Level 3 programs, taught by licensed G1-holders with years of industry experience. Our programs are approved by the TSSA.

Click below to learn more or chat live with an Admissions Advisor. We're here to help!

See an Overview of Gas Technician Training



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