TSSA Gas Technician 1 (G1)

Gas technician certification in Ontario is administered within the fuels safety framework of the Technical Standards and Safety Authority (TSSA), Ontario's public safety regulator. TSSA's website lists a Fuels Industry Professional certification page and a Register for an Exam page under Training and Professional Certification. Confirm current registration steps, fees and scheduling there rather than relying on third-party summaries.

Expect five equally weighted areas: gas fundamentals, codes and regulations; installation, servicing and troubleshooting of gas-fired appliances; piping, tubing, fittings and gas supply systems; venting, combustion air and flue gas management; and electrical controls, ignition systems and safety devices. Because each carries roughly 20 percent, no single domain can be skipped safely.

The G1 represents the broadest scope in the gas technician ladder, so questions tend to combine code knowledge with diagnostic reasoning rather than testing isolated facts. Candidates who memorise numbers without understanding why a vent or control configuration is unacceptable usually find the applied questions hardest. Build understanding of principles first, then attach specific code values to them.

Retake rules, waiting periods and any associated fees are set by TSSA and are not published in the source material used for this page, so they are not stated here. Check TSSA's examination and certification FAQ and the Register for an Exam page for the current policy before you book, and plan your study schedule assuming a single attempt.

The duration, question count and passing score are not confirmed in the source material available for this page, so no figures are given. Treat any specific number you see elsewhere as unverified until you confirm it with TSSA directly. In the meantime, practise under timed conditions so pacing is not a surprise on exam day.

Start with gas fundamentals, codes and regulations, because the other four domains assume that vocabulary and code logic. Move next to piping and gas supply systems, then venting and combustion air, since these interact physically. Add electrical controls and ignition systems once you understand appliance operation, and finish with installation, servicing and troubleshooting as a synthesis of everything.

Three recur: neglecting the least familiar domain because it feels abstract, memorising code numbers without the reasoning that lets you apply them to a scenario, and misreading questions that ask for the first action or the minimum requirement rather than the best practice. Deliberately practise venting and electrical control questions, and read each stem twice before answering.

Use your job as a source of cases. For each appliance you service, write down the venting arrangement, combustion air path, control sequence and safety devices, then check each against the code. This converts routine work into exam-style applied practice and exposes gaps in domains you rarely touch, such as commercial piping or specialty controls.

No. This is independent study material written for candidates searching for the G1 exam. It is not affiliated with, endorsed by or produced by TSSA, and it does not reproduce any official question bank. For authoritative documents such as code adoption documents, compliance standards and forms, use TSSA's Regulatory Document Search.