Ontario has more gas-heated homes than any other province, which makes it the largest gas tankless market in the country by volume. In 2023, 58% of Ontario households used natural gas for their primary heating system, 18% electricity and 4% propane, according to Statistics Canada. Competition is intense in the Greater Toronto and Hamilton Area, Ottawa and the southwest, and regulation is detailed.
We are a marketing service, not a contractor. This page covers what shapes tankless marketing in Ontario.
The Ontario market and its buyers
The short answer: dense suburban competition, plus a meaningful propane market in cottage and rural areas.
In the big urban regions, a tankless search can return dozens of companies, so differentiation matters: honest sizing, clear venting costs and maintenance plans stand out more than price claims. Outside the cities, propane serves many rural and cottage properties, and those buyers want someone who knows propane tankless specifically.
Who to target:
- detached and semi-detached gas-heated homes with ageing tanks;
- homeowners finishing basements who want the floor space;
- cottage and rural owners on propane;
- small commercial buyers, where your crew is set up for it.
Seasonality and climate
The short answer: cold winters moderated by the Great Lakes in the south, longer and colder in the north.
Southern Ontario's winters are cold but tempered near the lakes; northern Ontario's heating seasons are longer and harsher. Emergency replacements rise in late autumn and winter. Cottage-country propane work often follows the opening and closing seasons, which suits spring and fall campaigns.
The regulators to know
The short answer: TSSA for fuels, ESA for electrical.
Only TSSA-registered fuels contractors, using certified gas technicians, may carry out fuels work in Ontario. TSSA's Fuels Safety advisory on plastic vents, FS-101-07, requires ULC S636 certified vent and gives a water heater replacement as the example where existing plastic venting is replaced; a variance route exists for limited, tested cases. Electrical work for others needs an ESA Licensed Electrical Contractor, and only licensed contractors may advertise it, which matters if you install electric tankless units. Our plastic vent explainer covers the advisory in detail.
Programs relevant to tankless, as of October 2026
The short answer: the main program pays for heat pump water heaters, not tankless.
Ontario's Home Renovation Savings program, delivered by Save on Energy and Enbridge Gas with provincial support, offers $500 back on qualified ENERGY STAR heat pump water heaters within its assessment-based bundle. Tankless and gas water heaters were not listed when we checked. Other offers in the program focus on heat pumps, insulation, windows, air sealing, thermostats, appliances and solar.
That matters for marketing: if a competitor implies an Ontario rebate on gas tankless units, it is worth checking their source.
A note on electric tankless in Ontario
The short answer: possible, but explain the electrical side honestly.
Some callers without gas will ask about whole-home electric tankless units. Those often need significant electrical capacity, and any electrical work for others must be done by an ESA Licensed Electrical Contractor. A short page that explains this, and points to alternatives you do install, keeps the conversation honest.
How we'd market tankless in Ontario
The short answer: win on specifics in crowded markets and own the propane niche outside them.
- Make TSSA registration visible. State it plainly on service pages and quotes.
- Price venting openly. In crowded markets, a quote that explains the vent line beats one that hides it.
- Separate propane pages and ads for cottage and rural areas.
- Avoid rebate confusion. If you also sell heat pump water heaters, explain which product the $500 rebate applies to.
- Build maintenance plans. A long install history in a competitive market is worth more when customers come back.
Our sister newsroom WaterHeaterNews.ca covers Ontario's water heater rental and door-to-door rules, which we don't. From our HVAC work, Roma Heating & Cooling grew organic traffic 400% in 12 months. Our Google Ads service and local SEO service usually come first here. See all regions, then call, text or email.
Frequently asked questions
Is there an Ontario rebate for tankless water heaters?
Not in the Home Renovation Savings program when we checked in October 2026. Its water heater rebate is $500 for qualified heat pump water heaters, as part of a bundle after a home energy assessment. Tankless and gas units weren't listed.
Who can install gas tankless heaters in Ontario?
Fuels work must be done by TSSA-registered fuels contractors using certified gas technicians. Advertising should make clear your company holds the registration.
Do I need to replace the old vent on a tankless conversion?
TSSA's plastic vent advisory says that when a water heater is replaced, existing plastic venting is generally replaced with a ULC S636 certified system, with a variance route only in limited, tested cases. The installing contractor decides on the day.
Should Ontario installers mention electrical work?
Only accurately. Electrical work for others in Ontario requires an ESA Licensed Electrical Contractor, and only licensed contractors may advertise electrical work.
Sources
- Statistics Canada: Table 38-10-0286-01 (2026-10-23)
- TSSA: Contractor registration and certification (2026-10-23)
- TSSA Fuels Safety Program: Advisory FS-101-07, Plastic Vents, revision R1 (2014-04-07)
- Save on Energy: Home Renovation Savings (2026-10-23)
- Electrical Safety Authority (2026-10-23)