Based on public Canadian cost guides, replacing a water heater in Ontario typically costs about $1,500–$3,500 installed for a gas tank and $3,500–$6,500 for a tankless or heat pump water heater, before tax. The type you choose and how much venting, gas line or electrical work it needs make the biggest difference. Here’s what each type typically costs, how buying compares with renting, and how to get an accurate number.
Typical water heater replacement costs in Ontario (2026)
| Water heater type (typical home size) | Typical installed range in Ontario |
|---|---|
| Atmospheric (chimney-vented) gas tank, 40–50 gallons | About $1,500–$2,500 |
| Power vent gas tank, 40–50 gallons | About $2,000–$3,500 |
| Gas tankless (on-demand), condensing | About $3,500–$6,000 |
| Heat pump (hybrid electric) water heater | About $3,500–$6,500 |
These are typical installed price ranges in Ontario based on public sources (listed below), including equipment and standard installation, before tax and rebates. They’re not a Lancaster quote; your price depends on your home and the system you choose.
What each type means:
- Atmospheric tank: vents through a chimney using natural draft. The simplest and lowest-cost option where the chimney is still suitable.
- Power vent tank: a blower pushes exhaust through plastic pipe in a side wall, so no chimney is needed.
- Tankless: heats water only as you use it, for endless hot water. It’s wall-mounted, saving floor space.
- Heat pump water heater: an electric tank that moves heat from the surrounding air into the water. Very efficient, and a good fit for homes without natural gas.
For a deeper comparison, read tankless vs. tank water heaters, or browse the water heaters we carry.
What changes the price
- Sizing: tanks are sized by capacity and recovery rate; tankless units by flow rate for the fixtures you use at once. A larger household needs a bigger tank or a higher-capacity tankless unit.
- Efficiency: condensing tankless units and heat pump water heaters cost more up front but use less energy.
- Venting: switching from a chimney to power vent or tankless means new plastic venting. If a new furnace has left your water heater alone in a chimney, it may need a liner or a different venting type.
- Gas line: tankless units draw much more gas at full output, so an existing gas line may need upsizing. See gas lines.
- Electrical: power vent and tankless units need an outlet; heat pump water heaters need a suitable circuit, which may mean panel work.
- Condensate drain: condensing tankless units and heat pump water heaters need a drain or condensate pump.
- Permits and removal: a gas permit, safety checks and disposal of the old heater belong in a complete quote.
Buying vs. renting
Many Ontario homes rent their water heater. Lancaster doesn’t offer rentals, but here’s how the two compare:
- Renting: the rental company owns the tank. You pay a monthly fee, often quoted at about $30–$40 depending on size, and many contracts increase it each year. Repairs and replacement are usually included.
- Buying: you pay up front (or finance it), choose the model and own the heater. Over the life of a tank, buying often costs less, but you’re responsible for maintenance and repairs after the warranty.
If you rent now, check your agreement for buyout, removal and termination terms before replacing it.
Rebates and financing
According to our rebates guide, a heat pump water heater qualifies for a $500 rebate through the Home Renovation Savings assessment stream, which requires a home energy assessment and at least two upgrades. That stream is closing: the follow-up assessment must be booked by November 30, 2026 and completed by December 31, 2026. We don’t currently list rebates for standard tank or tankless water heaters.
Financing: spread the cost over monthly payments with Financeit financing.
Ways to save
- Right-size it. A heater matched to your household avoids paying for capacity you’ll never use, or running out of hot water.
- Replace before it fails. A tank usually lasts about 10–12 years. Planning ahead avoids an emergency replacement and water damage from a leak.
- Keep venting simple where it’s safe. If your chimney is still suitable, a like-for-like tank is usually the lowest-cost option.
- Maintain it. Flushing a tank and descaling a tankless unit, especially with Hamilton’s hard water, helps it last longer and run efficiently. See water heater maintenance and our service plans.
How to compare water heater quotes
Ask every contractor:
- What’s the exact model, capacity (or flow rate for tankless) and venting type?
- Does my chimney still suit an atmospheric tank, or will the venting need to change?
- Is my gas line large enough, especially for a tankless unit, and is any electrical work needed?
- What’s included: venting, gas and water connections, expansion tank if required, condensate drain, permit and safety checks, removal and disposal of the old heater?
- If I rent now, what do I need to do with the rental company before installation?
- What warranty is included on the tank or heat exchanger, parts and labour?
Get an accurate quote
Online ranges are a starting point. Your price depends on your hot water needs, venting, gas line and electrical service. Lancaster Heating and Cooling installs Navien, Bradford White and John Wood water heaters. We’ll look at your setup, explain your options and give you a clear, itemized quote at no cost. See water heater installation.
Request a free in-home quote, ask about financing, or call 905-388-3333.
Sources
Typical ranges are rounded from these public Canadian sources (checked November 2026):
- HomeStars: water heater replacement cost, hot water tank replacement cost and tankless water heater cost
- Cansumer: hot water heater cost
- The Home Depot Canada: water heater installation
- Reno Quotes: tankless water heater cost in Canada (2026)
- Ontario Furnace Prices: water heater prices in Ontario
- Get a Better Quote: heat pump water heaters in Ontario
- Apex Electric and Mechanical: water heater installation cost in Toronto
- Rebate details: our rebates guide, which links to the official program pages.
