How Much Does a Tankless Water Heater Installation Cost?

Tankless water heaters — also called on-demand heaters — are increasingly popular with homeowners who want endless hot water, better efficiency, and a space-saving design. The biggest question is usually about cost. Here is a clear breakdown for the GTA, including what affects the price and which rebates apply in 2026.

Average Tankless Installation Cost

In the Greater Toronto Area, a tankless water heater installation typically runs $2,800 to $4,800+ (CAD). That covers:

• The tankless unit
• Professional installation by a licensed technician
• Basic plumbing and venting
• System setup and testing

For larger homes, high-efficiency models, or complex jobs, the price can exceed $5,000.

What Affects the Cost

1. Type of unit

Gas tankless heaters are more powerful and well suited to whole-home use, but may need venting upgrades. Electric tankless units have a lower install cost but may require an electrical panel upgrade.

2. Flow rate and capacity

Larger homes or households with multiple bathrooms need a higher GPM (gallons per minute), which means a larger, pricier unit. Proper sizing prevents the “two showers at once and it can’t keep up” problem.

3. Installation complexity

Replacing a tank with tankless may require changes to gas lines, water lines, or venting. Electrical panel upgrades for electric units can add $500 to $1,500, and tight spaces add labour.

4. Brand and efficiency

Premium brands like Navien, Rinnai, or Noritz cost more but often last longer and run more efficiently.

Operating-Cost Savings

The upfront cost is higher than a tank, but a tankless unit can save roughly $100 to $200 a year on energy by eliminating standby heat loss — and it lasts longer, around 15 to 20 years versus 8 to 12 for a tank. Our tank vs. tankless guide compares the full picture, including the efficient heat pump water heater option.

Rebates and Incentives (Updated for 2026)

Energy-efficient water heating may qualify for current Ontario incentives through the Home Renovation Savings Program (Enbridge Gas and Save on Energy). One important correction: the federal Canada Greener Homes Grant has closed to new applications, so the provincial program is the live channel — and it is especially relevant for high-efficiency heat pump water heaters. Our rebate guide keeps the current details.

What a Professional Install Includes

• Delivery and installation of the unit
• Disconnection and removal of your old tank
• Gas or electric connections
• Venting installation or upgrades
• Full testing and commissioning
• Warranty support and registration

The takeaway: budget $2,800 to $4,800+ for tankless, expect ~$100–$200/year in operating savings and a 15–20 year lifespan, and check current Home Renovation Savings Program rebates — not the closed federal grant.

If you want unlimited hot water, lower running costs, and a compact system, tankless is a strong choice for many GTA homes. Request a free consultation and quote or explore our water heater installation service, and we will help you choose the right unit and install it properly.