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Intro to G2 Licensing. (Gas Technician 2)
If you are looking to work in the heating and gas industry in Ontario, the G2 license is one of the most important certifications you can get. It is the most common license in the HVAC field and opens the door to a wide range of job opportunities in residential and light commercial work.
What is the G2 License?
The G2 license—short for Gas Technician 2—is issued by Ontario's Technical Standards and Safety Authority (TSSA). It allows certified technicians to work with natural gas and propane appliances safely and legally.
Once you're certified, you can install, service, and maintain gas equipment like furnaces, water heaters, fireplaces, boilers, and other heating appliances.
Who Is the G2 License For?
This license is perfect for:• People starting a career in HVAC
• Apprentices ready to move up from a G3 license
• Anyone who wants to work independently on gas equipment in homes or small businesses
If you're looking for hands-on work with real-world job opportunities, G2 certification is a solid choice.
What Can You Do With a G2 License?
Once certified, a G2 technician can:• Work independently (no supervision needed)
• Install, repair, and maintain appliances up to 400,000 BTUH
• Work in residential homes, small commercial buildings, and similar environments
This means you could be doing jobs like:
• Installing a new furnace
• Fixing a gas fireplace
• Servicing a water heater
• Running gas lines safely and legally
What Do You Need Before Getting G2 Certified?
To get your G2 license, you must:• First earn your G3 license
• Complete a TSSA-approved G2 training program
• Pass the G2 certification exam
TSSA G2 Exam Structure & Format
Before you take the G2 exam, it is important to understand what you are walking into. You will have to manage your time and stress on test day.
Here is a quick breakdown of what the exam looks like so you can prepare with confidence.
HVAC G2 Exam Format
• Multiple-choice questions
• Based on real-world HVAC and gas scenarios
• No hands-on or practical component
• Paper-based or computer-based depending on the testing center
HVAC G2 Exam Duration
• 3 hours total
• Around 100 to 150 questions
Time management is key—most questions are short, but a few require careful reading
How To Pass the HVAC G2 Exam
• 75% or higher is needed to pass
• Results are sent by the TSSA
If you fail, you can retake the exam (after a waiting period)
Want to see what the real exam feels like?
Try a full-length G2 practice exam - generated instantly from our database of real-style questions.
Our G2 practice exams are designed to help you prepare for the real exam. A one-time purchase gives you access to unlimited G2 practice exams & more!
What to Expect on Exam Day
Knowing what the day of your G2 exam will look like can help reduce stress and make sure you're fully prepared. While the questions test your knowledge, your success also depends on how ready and calm you are when you show up.
Here’s what you can expect:
Before the G2 Exam
• Bring valid ID (usually government-issued)
• Arrive early – at least 15–30 minutes ahead of time
• The exam is usually held at a TSSA-approved test center, college, or private training facility
Leave personal items (like phones or bags) in a designated area
During the G2 Exam
• You’ll be seated in a quiet, supervised room
• You’ll receive a test booklet or computer login
• No outside materials are allowed unless it’s an open-book portion (verify with your training provider)
• Scratch paper and pencil may be provided
If you need help (bathroom, technical issue), raise your hand and a proctor will assist you
After the G2 Exam
• Submit your materials and sign out
• Results are typically mailed or emailed by the TSSA
If you pass, your G2 license will be processed
If not, you can rebook and try again (most people pass on the second attempt with proper prep)
Tip:
Don’t cram the night before.
A good sleep and a clear head make a bigger difference than one more hour of study.
HVAC G2 Practice Question Samples
This is a sample of the type of questions you will see on the G2 exam and in our G2 exam preparation tools.
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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Where to Take a G2 Course
TSSA Accredited G2 Courses
There are 20+ TSSA accredited training providers in Ontario who can provide you with the hands on training you will need in order to become certified as a Gas Technician.
Here are some of the most popular G2 training & certification providers: