Heat Pump Water Heaters in Ontario: Costs, Savings and Whether One Suits Your Home
Heat pump water heater Ontario guide: installed costs, savings vs electric and gas tanks, space and noise requirements, rebates and when it is worth switching.
Key takeaways
- A heat pump water heater typically uses about a third of the electricity of a standard electric tank.
- Replacing an electric tank can save a family of four roughly $300 to $450 a year (estimate).
- Compared with an owned gas tank at current gas prices, operating costs are similar or slightly higher, so the case rests on rental savings, emissions or other goals.
- It needs space, a condensate drain and usually a 240 V circuit, and it cools and dehumidifies the room it is in.
A heat pump water heater in Ontario usually costs about $3,500 to $6,500 installed (estimate) and uses roughly a third of the electricity of a standard electric tank, because it moves heat from the surrounding air into the water instead of making heat with a resistance element. It is one of the best-value upgrades for homes with an electric water heater, but the savings are much smaller if you are replacing a gas tank.
Water heating accounts for roughly 19% of energy use in a typical Canadian home, according to Natural Resources Canada, so the choice of water heater matters. This guide explains how heat pump water heaters work, what they cost to run in Ontario, what your home needs, and when to choose something else.
How does a heat pump water heater work?
A heat pump water heater (sometimes called a hybrid water heater) is a storage tank with a small heat pump on top. A fan pulls room air over a cold coil, a compressor concentrates that heat, and the heat goes into the water. Most units also have backup electric elements for times of high demand.
Efficiency is shown as the Uniform Energy Factor (UEF):
| Water heater type | Typical UEF |
|---|---|
| Standard electric tank | About 0.90 to 0.95 |
| Standard gas tank | About 0.60 to 0.70 |
| Condensing gas tank or tankless | About 0.80 to 0.96 |
| Heat pump water heater | About 3.0 to 4.0 |
A UEF of 3.5 means the unit delivers about 3.5 units of heat to the water for every unit of electricity it uses, under test conditions.
Most units offer several modes: heat pump only (most efficient), hybrid (heat pump with element backup), electric only (fastest recovery) and vacation.
How much does a heat pump water heater cost to run in Ontario?
The table below compares typical annual operating costs for a family of four. These are estimates using about 15¢ per kWh all-in for electricity and 45¢ per m³ for gas. Your costs depend on hot water use, inlet water temperature and the unit you choose.
| Option | Annual energy (estimate) | Annual energy cost (estimate) | Other costs |
|---|---|---|---|
| Electric tank | 3,500 to 4,500 kWh | $525 to $675 | Rental fee if rented |
| Gas tank (owned) | 250 to 350 m³ | $115 to $160 | Venting; rental fee if rented |
| Heat pump water heater | 1,100 to 1,500 kWh | $165 to $225 | Higher purchase price |
Two points stand out:
- Replacing an electric tank: savings of roughly $300 to $450 a year are typical, giving a simple payback on the extra cost over a new electric tank of roughly 7 to 13 years before any rebate, and shorter if you are also ending a rental.
- Replacing a gas tank: at current gas prices, operating costs are similar or slightly higher with a heat pump water heater. Since the federal carbon charge on gas was removed in April 2025, gas has become cheaper to run, which widens that gap. The case for switching usually rests on ending a rental contract, reducing emissions, or freeing the home from gas if you are also moving to a heat pump for space heating.
Use our water heater comparison calculator to run your own numbers, including rental fees.
Tip: On Ultra-Low Overnight pricing, some homeowners schedule the heat pump water heater to run mostly between 11 p.m. and 7 a.m. at 3.7¢/kWh. A larger tank and a mixing valve help this work. Check that the unit's controls allow scheduling.
Does your home suit a heat pump water heater?
Run through this checklist before getting quotes:
- Space. Most manufacturers ask for a fairly large room, often around 20 m³ (700 ft³) of air volume, or ducting, or a louvred door. Cramped closets usually do not work.
- Room temperature. Heat pump mode works best between about 10 °C and 30 °C. Many units switch to electric elements below about 4 to 7 °C, which makes cold garages a poor location in Ontario winters.
- Height. Units are taller than standard tanks because the heat pump sits on top. Measure ceiling clearance.
- Condensate drain. The unit removes moisture from the air and needs a floor drain, a condensate pump or a laundry tub nearby.
- Electrical. Most units need a dedicated 240 V circuit, typically 30 A. Some newer 120 V models can plug into a standard dedicated outlet, which helps when replacing a gas tank. Electrical work needs an ESA permit; see esasafe.com (opens in a new tab).
- Noise. Expect a sound similar to a dehumidifier or quiet window air conditioner, roughly 45 to 55 dBA. Avoid placing it next to a bedroom.
- Hot water demand. Recovery in heat pump mode is slower than with gas. Large households often choose a 280 to 300 L (about 75 to 80 gallon) tank.
Will it make my basement cold?
A heat pump water heater pulls heat from the room. In summer, the cooling and dehumidifying are a bonus for many Ontario basements. In winter, that heat ultimately comes from your space heating system.
For a gas-heated home, the extra heating cost is usually modest, often in the range of $20 to $60 a year (estimate), because the unit removes only a moderate amount of heat and much of it would have been lost from the basement anyway. In a home heated by electric baseboards, the effect is larger. If the basement is finished and used as living space, ducting the intake or exhaust is worth discussing with your installer.
What does installation involve?
| Item | Typical range (estimate) |
|---|---|
| Unit (190 to 300 L) | $2,200 to $4,000 |
| Installation, plumbing and mixing valve | $800 to $1,800 |
| Electrical circuit (if needed) | $300 to $1,200 |
| Removing gas tank and capping gas line (if switching) | $200 to $600 |
| Typical total | $3,500 to $6,500 |
If you are switching from gas, the old venting must be properly closed and the gas line capped by a licensed gas technician, under TSSA rules. Ask whether your furnace or boiler shares the vent, since removing the water heater can affect venting of the remaining appliance.
Rebates and rentals
A heat pump water heater can earn $500 under the assessment stream of the Home Renovation Savings Program, which requires pre- and post-retrofit energy assessments and at least two eligible upgrades. Reported 2026 deadlines are tight, so confirm details on saveonenergy.ca (opens in a new tab) before committing. See our Home Renovation Savings Program guide.
Many Ontario homes rent their water heater. Before switching, check your contract for buyout or removal charges, and arrange the return of the rental unit. Our guide to water heater rentals explains your options.
Frequently asked questions
How long does a heat pump water heater last?
Many manufacturers offer 10-year tank warranties, and lifespans are generally similar to standard tanks, roughly 10 to 15 years with maintenance. Clean the air filter every few months and flush the tank as recommended.
Can I install one in a cold garage in Ontario?
It is usually not a good idea. In winter the garage is too cold for efficient heat pump operation, and the unit will rely on its electric elements, which removes most of the savings.
Is a heat pump water heater better than tankless?
For homes with electric water heating, a heat pump water heater is usually far cheaper to run than electric tankless, which also needs a very large electrical service. Compared with condensing gas tankless, it depends on prices and goals. See our guide to tankless water heaters.
What maintenance does it need?
Clean or replace the air filter, keep the condensate drain clear, test the relief valve and flush sediment as the manufacturer recommends. Ontario's hard water in many areas makes flushing worthwhile.
About this page. Written and reviewed by the Energy Efficiency Ontario editorial team using official sources including the Ontario Energy Board, Save on Energy (IESO), Enbridge Gas and Natural Resources Canada. Figures are estimates unless attributed. Program terms change — confirm with the administrator before you buy. Our editorial standards · Report an error
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