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Lunarlink Solutions, Toronto
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The Technical Standards and Safety Authority regulates fuel-burning equipment in Ontario. Any work on natural gas, propane, or oil-fired equipment, which covers furnaces, boilers, water heaters, fireplaces, and gas ranges, has to be done by a certified technician working for a licensed fuels contractor.
This is a plain-language summary, not legal advice. Rules change and thresholds get revised, so confirm anything you are relying on against the regulator's own page.
Gas technician certification runs in three levels. The entry grade covers a narrow set of appliances under a low input rating. The middle grade covers most residential and light commercial work. The senior grade covers the largest equipment. Homeowners rarely ask which grade attended, but the certification determines what the technician is legally allowed to touch.
Purely electrical work does not. An air conditioner changeout, a heat pump, or the electrical hookup on any of it falls under the electrical authority instead. That distinction matters more every year as heat pumps take a larger share of the work, because an HVAC business can now be doing a great deal of installation that never touches a gas line.
Other provinces run their own regimes with different names and different certificates. A national HVAC brand cannot claim one province's credential everywhere, and a site serving more than one province should say plainly which certifications apply where.
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