Heating system installation and servicing in Ontario is among the most heavily regulated residential trades. This is appropriate — improperly installed or serviced gas and oil equipment can cause fires, explosions, and carbon monoxide poisoning. Homeowners in Renfrew County should understand the licensing requirements that apply to any contractor who works on their heating system, as well as the permits that may be required before and after installation.
TSSA: The Primary Regulatory Authority
The Technical Standards and Safety Authority (TSSA) is a delegated administrative authority under Ontario's Technical Standards and Safety Act. TSSA regulates the installation, servicing, and repair of gas and oil heating equipment throughout Ontario. No contractor may work on a natural gas, propane, or oil heating system in Ontario without a valid TSSA licence — this is not a credential that can be waived or substituted.
TSSA also registers contractors and enforces compliance through inspections and incident investigations. Homeowners can verify whether a specific contractor holds a valid TSSA licence using the public licence lookup tool at tssa.org.
Gas Technician Licence Classes
Ontario's gas technician licensing system is tiered by scope of work:
- G1 — Unrestricted Gas Technician: Authorizes work on any gas system, including large commercial and industrial installations. Full qualification — most experienced gas contractors hold G1.
- G2 — Residential and Small Commercial Gas Technician: Authorizes gas work on systems with inputs of 400,000 BTU/hr or less — which covers the vast majority of residential furnaces, water heaters, and heating equipment. G2 is the minimum required licence for residential furnace installation or replacement in Ontario.
- G3 — Gas Appliance Technician: Limited to connecting gas appliances to existing supply lines — not authorized for furnace installation or fuel piping work. G3 alone is insufficient for furnace or boiler work.
When hiring a contractor for furnace replacement or any gas heating work, confirm they hold at minimum a G2 licence. A G3-only contractor is not qualified for the work.
Oil Burner Technician (OBT) Licence
Work on oil-fired heating equipment — including oil furnaces, oil boilers, and associated oil burner components — requires a separate TSSA licence: the Oil Burner Technician (OBT) licence. This is not the same credential as a gas technician licence. An OBT must be licensed specifically to work on oil combustion equipment.
Given the prevalence of oil heating in rural Renfrew County, verifying OBT licensing is particularly important when hiring for service or replacement of oil furnaces. As with gas licences, OBT status can be confirmed at tssa.org.
ESA Permit: Electrical Connections
Any new electrical connection to heating equipment — including furnaces, heat pumps, and boilers — requires a permit from the Electrical Safety Authority (ESA). Electrical work must be performed by a licensed electrician; the homeowner cannot self-perform this work on equipment that requires a permit. The ESA permit triggers an inspection to verify that the wiring, breaker sizing, and connections meet the Ontario Electrical Safety Code.
Heat pump installations commonly require a dedicated 240V circuit and, in many older rural homes, a full electrical panel upgrade from 100-amp to 200-amp service. This electrical work is a separate scope from the HVAC contractor's work and must be completed by a licensed electrical contractor with an ESA permit.
Building Permit: Municipal Requirements
A building permit may be required by your local municipality for new heating equipment installation, particularly when replacing or significantly modifying a system. Requirements vary between municipalities within Renfrew County — the County of Renfrew, the City of Pembroke, Petawawa, and surrounding townships each administer their own building permit programs.
In general, a building permit is more likely to be required when the work involves:
- Installing a new heating system type (e.g., replacing an oil furnace with a heat pump)
- Significant ductwork modifications
- Structural changes associated with equipment placement
For a straight like-for-like furnace replacement in the same location, a building permit may not be required — but confirm with your local municipality before proceeding. Permits that should have been pulled but weren't can create complications at time of sale. See the Renfrew County building permits guide for more detail.
Refrigerant Handling: Federal Certification
Heat pump systems use refrigerants that are regulated under Canada's Environmental Protection Act. Technicians who handle refrigerants — including those who install, service, or decommission heat pump systems — must hold federal certification for refrigerant handling under the regulations of Environment and Climate Change Canada. This is a separate requirement from TSSA licensing and applies specifically to the refrigerant circuits of heat pumps and central air conditioning systems.
When hiring for heat pump installation, confirm that the contractor's technicians hold appropriate refrigerant handling certification. Reputable HVAC contractors who regularly work on heat pumps will have this certification as a matter of course.
Carbon Monoxide Detector: Ontario Law
Ontario's Fire Protection and Prevention Act and associated regulations require that any home with a fuel-burning appliance (gas, propane, oil, or wood) must have a functioning carbon monoxide detector installed within 5 metres of every sleeping area. This requirement applies to all homeowners in Renfrew County with any fuel-burning heating system.
Carbon monoxide (CO) is an odourless, colourless gas produced by incomplete combustion. A cracked heat exchanger in an aging furnace, a partially blocked flue, or a poorly maintained burner can produce lethal concentrations of CO without any visible or audible warning. The detector requirement is a mandatory life-safety measure — not optional, and not waivable.
CO detectors should be tested monthly, have batteries replaced annually (if battery-operated), and be replaced every 5–7 years as sensor elements degrade over time.
TSSA Permits for Gas Work
Beyond licensing, TSSA also requires permits for specific gas work — including new gas appliance installations and modifications to gas piping. The TSSA permit process involves issuing a permit before work begins and inspecting the completed work afterward. Your licensed gas contractor should be familiar with this process and should pull the required TSSA permit as part of the installation. If a contractor suggests skipping the permit, that is a serious red flag.