Tankless Water Heater Cost in Canada: 2026 Guide

Tankless Water Heater Cost: Key Insights

• Labour and venting work together typically account for more than half the total cost.

• Switching from a storage tank to a tankless system in a home without a dedicated high-capacity gas supply line can add $500 to $1,500 to the project.

• Electric tankless models need significantly more amperage than a standard electric storage tank, which often requires a panel upgrade and adds $500 to $2,000 to the total cost.

• Without a scale filter at installation, mineral buildup can shorten the unit's lifespan by several years and reduce efficiency noticeably over time, notably in places where hard water is common: much of Alberta, Saskatchewan, Manitoba, and parts of Ontario.

Table of Contents

1. Average Tankless Water Heater Costs in Canada
2. Breakdown of Tankless Water Heater Installation Cost
3. Gas vs. Electric Tankless Water Heater
4. How to Save on Tankless Water Heater Costs
5. Find an HVAC Pro on HomeStars
6. Frequently Asked Questions

Average Tankless Water Heater Costs in Canada

Tankless water heater costs in Canada vary by fuel type, unit size, and how much infrastructure work the install requires. The table below shows typical installed cost ranges for the most common scenarios, including unit and labour.

Installation Scenario	Typical Installed Cost
Gas tankless: replacing existing gas tank, compatible venting	$2,800 to $4,500
Gas tankless: condensing model with new PVC venting	$4,000 to $6,500
Gas tankless: gas line upgrade required	$5,000 to $10,000
Electric tankless: no panel upgrade required	$800 to $2,500
Electric tankless: panel upgrade required	$2,500 to $4,500
Propane tankless water heater	$3,500 to $7,000

For a side-by-side comparison with traditional storage systems, see our hot water tank replacement cost guide and water heater installation cost guide.

Get matched with tankless water heater pros near you on HomeStars

A Breakdown of Tankless Water Heater Project Costs

Several factors can shift the total cost of a tankless water heater installation, largely depending on your home’s layout and the type of system you’re getting. Understanding them before you get quotes makes it easier to compare what contractors are actually including.

Fuel type

Gas systems cost more to install but tend to cost less to run in most provinces, due to the difference between gas and electricity rates. Electric units are simpler and cheaper to install when the panel can support them, but running costs depend heavily on your province. In Quebec and British Columbia, where hydro rates are low, the gap narrows considerably.

Labour

Carried out by plumbers, labour rates typically run $80 to $150 per hour and is consistently the largest line item on any tankless install, and rates vary more than most homeowners expect. The same job can cost significantly between cities and provinces, and complexity matters, too: a simple swap where everything is already in place is a very different job from one that involves new venting, gas line work, or an electrical panel upgrade.

Home infrastructure

What your home already has in place is often the biggest cost variable. Homes that need upgrades before a tankless unit can be installed typically fall into one or more of these situations:

• Venting: older homes with metal flue pipes that cannot be reused for modern condensing units
• Gas line capacity: supply lines sized for a storage tank that are too small for the higher BTU demand of a tankless heater
• Electrical panel: insufficient capacity for the dedicated high-amperage circuit an electric unit requires
• Home age and accessibility: older homes and tight mechanical rooms (finished walls, limited ceiling clearance, complex vent routing) add labour time regardless of system type

Permits

Gas and electrical work trigger permit requirements in most Canadian municipalities. Budget $100 to $500. Confirm whether your contractor pulls the permit on your behalf, and factor it into your quote comparison since some contractors include it and others do not. Unpermitted gas work can create complications when selling the home.

Rebates

Several provincial government structures and natural gas utilities offer rebates for high-efficiency tankless water heaters. Most programs require a pre-approval application before installation starts, not after. Ask your contractor what applies in your area before booking, since eligibility confirmed after the fact rarely qualifies.

Gas vs. Electric Tankless Water Heater: Which Is Right for Your Home?

Both gas and electric tankless water heaters have pros and cons, and each is suitable for certain layouts and setups. The right system depends less on preference and more on your home's existing infrastructure, your household's hot water demand, and your local energy rates.

Here is what to consider before choosing:

Home type and location

Gas is the practical choice for most Canadian homes with natural gas service, particularly larger households with high peak demand. Electric suits condos with venting restrictions, homes off the gas grid, and smaller households where a whole-home unit is not needed at all and a point-of-use unit will do the job.

Performance in cold climates

Both systems heat water on demand, but gas units produce higher flow rates and maintain output more consistently when groundwater is cold. In Canadian winters, incoming water can be cold enough to reduce the effective flow rate of an electric unit if it is not sized generously. Gas has a practical edge for large households running multiple fixtures simultaneously.

Long-term cost of ownership

While gas tends to cost less to run in most provinces, the unit itself has more components to maintain and service. Electric units are mechanically simpler, have fewer parts that can fail, and typically have lower annual maintenance costs. Over a 15 to 20 year lifespan, the gap between the two narrows when you factor in service calls alongside energy bills.

Future-proofing

Some Canadian municipalities are beginning to restrict or phase out gas connections in new construction. If you are in an area where this is under discussion, it is worth checking local regulations before committing to a gas system, particularly if you are planning a renovation or new build rather than a straight replacement.

Get quotes for tankless water heater installation

How to Save on Tankless Water Heater Costs

A tankless water heater is a significant investment, but there are several ways to reduce the total cost without cutting corners on the install.

• Get multiple quotes: Labour rates can vary between contractors for the same scope of work. Two or three quotes give you a realistic picture of what the job should cost in your area.

• Check rebate programs before booking: Ontario, British Columbia, and several natural gas companies offer incentives for high-efficiency tankless water heaters. Most programs require ENERGY STAR certification and a pre-approval application before the installation. Confirm what applies in your region with your contractor or directly with your utility.

• Bundle with other work: If you are also replacing a furnace or doing other gas or plumbing work at the same time, combining the jobs with one contractor can reduce the overall labour cost. Our heating and cooling cost guide covers what to expect for related heating system work.

• Choose a condensing model: The higher upfront cost of a condensing gas unit typically pays back through lower gas bills within a few years, particularly in households with high daily hot water use.

• Add a scale filter in hard water regions: An inline scale filter costs $200 to $700 to add at installation and reduces descaling frequency, cutting long-term maintenance costs in regions with hard water.

Find an HVAC Pro on HomeStars

Getting the right pro matters with a tankless install because the unit, the gas supply, the venting, and the electrical connections all need to work together for the system to perform well and meet local code. HomeStars connects you with local plumbers who handle tankless water heater installations, so you can read reviews from other homeowners, compare approaches, and decide who to contact before any work begins. Post your job for free, describe your existing setup, and let interested pros come to you with their assessments and quotes. On HomeStars, all verified pros undergo checks at registration, including ID documents and company details, allowing you to hire with confidence.

Post your tankless water heater job on HomeStars

Frequently Asked Questions About Tankless Water Heater Costs

Is a tankless water heater worth the higher upfront cost?

For most Canadian households, the answer depends on hot water usage and how long you plan to stay in the home. A tankless unit typically lasts 15 to 20 years compared to 8 to 12 years for a storage tank, and gas condensing models can reduce water heating bills by 20 to 30 percent annually. If your household uses a significant amount of hot water and you are planning to stay in the home for more than five or six years, the total cost of ownership over time is generally lower than replacing tanks repeatedly.

Heat pump water heaters can be more efficient in the right climate and often qualify for larger rebates, but they require more space and a higher upfront investment, so they are worth comparing if you are not already on gas. You can read our guide to learn more about heat pump installation costs and see if it would be a better option for you.

Can I install a tankless water heater myself?

Gas appliance installation in Canada requires a licensed gas technician, and most municipalities require a permit and inspection before the work is approved. Improper installation creates carbon monoxide risks and can void the manufacturer warranty. Electric tankless installs involving panel work similarly require a licensed electrician. Both installation types fall under regulated trades in Canada, so this is not a DIY project.

What should I ask a pro before booking a tankless water heater installation?

Ask whether the quote includes permits, venting, and any gas line or electrical work, or whether those are priced separately. It is also worth confirming how long the labour warranty covers the installation itself, separate from the manufacturer warranty on the unit. You can read reviews and compare profiles of available HVAC pros on HomeStars before reaching out, which makes it easier to shortlist contractors who have done similar installs in your area.

How long does a tankless water heater installation take?

A straightforward gas-for-gas swap, where the venting and gas supply are already compatible, typically takes three to five hours. Installs that require new venting routes, a gas line upgrade, or panel work can take a full day or more. Your contractor can give a more accurate time estimate after assessing your existing setup.

What ongoing maintenance does a tankless water heater require?

Descaling is the main recurring task. Mineral buildup from hard water accumulates inside the heat exchanger over time and reduces efficiency. Annual descaling by a pro typically costs $150 to $300, and adding a scale filter at installation reduces the frequency needed. Most manufacturers also recommend a general inspection once a year to maintain the warranty.

How do I know what size tankless water heater my home needs?

Sizing is based on peak hot water demand, measured in gallons per minute, and how much the unit needs to raise the incoming water temperature. Canadian groundwater runs colder in winter, so the unit has to work harder to reach the target temperature than the flow rate spec alone suggests. A one- or two-person household typically needs a unit rated at 6 to 8 GPM, while a household of four or more should look at 9 to 12 GPM. A pro can assess your home's peak demand and recommend the right capacity before you purchase anything.

How do I compare quotes for a tankless water heater installation?

Ask each contractor to itemise the quote into unit cost, labour, venting, any gas line or electrical work, permits, and removal of the old system. A low headline number can hide the fact that venting or gas line upgrades are excluded. It is also worth confirming whether the contractor will pull the permit on your behalf or whether that falls to you. You can post your job on HomeStars and receive responses from available plumbers in your area, which makes it straightforward to compare approaches and pricing side by side before committing.