A heat pump water heater is an electric storage tank with a small refrigeration system on top. A fan pulls room air across a cold coil, a compressor concentrates that heat, and a condenser passes it into the tank. Because it moves heat instead of making it, it typically delivers about three units of heat per unit of electricity, using far less power than a standard electric tank.
- Natural Resources Canada says ENERGY STAR certified heat pump water heaters use up to 70% less energy, on average, than a standard electric water heater.
- The unit takes heat from the room around it, so in a Canadian winter some of that heat is replaced by your furnace; in summer it cools and dehumidifies for free.
- Most models need a condensate drain, room air volume or ducting, and usually a 240 V circuit; they hum like a dehumidifier.
- Recovery in heat pump mode is slower than a gas tank, so many households size up one step and use hybrid mode for peaks.
- Ontario and B.C. listed heat pump water heater rebates when checked in September 2026; federal minimum efficiency rules for them are proposed, not yet in force.
01 /How does a heat pump water heater work?
A heat pump water heater works like a refrigerator running in reverse. A refrigerator pulls heat out of its food compartment and dumps it into your kitchen through the coil at the back. A heat pump water heater pulls heat out of the room air and dumps it into a tank of water. Natural Resources Canada puts it plainly: the technology does not generate heat directly, it moves heat from one place to another.
- Air in
A fan on top draws room air across the evaporator coil. Refrigerant inside the coil is colder than the air, so it absorbs heat and boils into a gas.
- Compressor
The compressor squeezes that gas, which raises its temperature well above the temperature of the water in the tank.
- Heat into the tank
The hot refrigerant flows through a condenser wrapped around or immersed in the tank, giving up its heat to the water and condensing back into a liquid.
- Expansion and repeat
An expansion valve drops the refrigerant's pressure and temperature so it can absorb heat from the room air again. Cool, drier air leaves the unit.
- Backup elements
Most units also have one or two ordinary electric resistance elements. In hybrid mode the controls use them only when demand outruns the heat pump.
Because it moves heat, its efficiency can exceed 100%. A heat pump water heater with a uniform energy factor (UEF) of 3.0 puts about three kilowatt-hours of heat into your water for every kilowatt-hour it draws from the grid. A standard electric tank converts electricity to heat at close to one-for-one and loses some of it as standby heat, so its UEF sits just under 1. Natural Resources Canada says an ENERGY STAR certified heat pump water heater uses up to 70% less energy, on average, than a standard electric water heater. The efficiency and UEF guide explains the rating in detail.
02 /Do heat pump water heaters work in cold Canadian basements?
Yes, but performance depends on the temperature of the space, and the winter trade-off is real. A heat pump water heater takes heat from the air around it, not from outdoors. A finished or partly heated basement at typical indoor temperatures gives it plenty to work with; an unheated crawlspace, cold storage room or garage in January does not, and most units switch to their resistance elements when the room is too cold for the compressor.
The winter nuance is what many brochures skip. In a heated house, every unit of heat the water heater removes from the basement is heat your furnace or boiler eventually has to replace. Natural Resources Canada's Water Heater Guide makes the same point: heat pump water heaters remove heat and humidity from the air, reduce air conditioning needs in summer, and are less advantageous in winter when space heating is required. In summer that effect is a bonus; in a long heating season it shifts part of the water heating load onto your space heating system.
| Location | Heat pump performance | Side effect |
|---|---|---|
| Heated basement or utility room | Good year-round | Mild cooling and drying; some winter heat drawn from the house |
| Unheated basement that stays above about 10 °C | Reduced in winter; representative UEF drops toward 2.5 | Basement gets cooler; backup elements run more |
| Cold garage or crawlspace in winter | Often below the compressor's operating range | Unit runs on resistance elements, losing most of the benefit |
| Warm furnace room or space with waste heat | Very good | Uses heat that would otherwise be wasted |
The Energy Cost Comparer lets you run a heat pump at a representative UEF of 3.0 or at 2.5 for a cold basement, so you can see how much the location matters for your own electricity price.
03 /Where can a heat pump water heater go in a house?
A heat pump water heater needs air to work with, a drain for condensate, room overhead for the heat pump module, and usually a 240-volt circuit. The exact numbers come from each model's installation manual, so treat the list below as the questions to ask rather than universal rules.
- Air volume or ducting. Manufacturers specify a minimum room volume, a louvred door or ducted intake and exhaust. A small closed closet usually does not qualify without ducting or venting.
- Height and service clearance. The heat pump module sits on top, so these units are taller than a standard tank of the same volume. Check ceiling height and joist clearances, plus room to remove the filter and top cover.
- Condensate drain. The evaporator pulls water out of the air. That water has to go to a floor drain, laundry standpipe or condensate pump. No drain, no install.
- Electrical. Most integrated models on the Canadian market use a 240 V circuit similar to a standard electric tank. Some newer 120 V plug-in models are designed to reuse an ordinary outlet, usually with slower recovery. Confirm on the spec sheet.
- Noise. Expect a steady hum similar to a dehumidifier while the compressor runs. Keep it away from bedrooms or a home office sharing a thin wall.
- Cool exhaust air. The air leaving the unit is several degrees cooler. Do not aim it at a spot where people sit or where pipes could freeze.
04 /How should you size a heat pump water heater?
Size a heat pump water heater by first-hour rating like any tank, then consider one size larger, because the heat pump alone reheats water more slowly than a gas burner or even the resistance elements. In hybrid mode the elements help during peaks, at the cost of some efficiency.
The Water Heater Size Calculator uses typical first-hour ratings for electric and heat pump tanks of about 200 L for a 40-gallon model, 235 L for 50, 270 L for 65 and 330 L for 80 gallons. Those are planning figures: the actual rating is on each model's label and spec sheet. A household whose peak hour is about 220 L lands on a 50-gallon unit by the numbers; if it regularly has back-to-back showers, a 65-gallon unit gives the heat pump more stored buffer to work through without calling on the elements.
| Mode | What runs | When to use it |
|---|---|---|
| Heat pump only | Compressor only | Lowest cost; fine when demand is modest and predictable |
| Hybrid or auto | Compressor first, elements for peaks | Most households, most of the time |
| High demand | Compressor plus elements more readily | Guests, holidays, heavy bath use |
| Electric or resistance | Elements only | Room too cold, or heat pump fault |
| Vacation | Holds a low temperature | Extended absences |
05 /What does a heat pump water heater cost to run compared with gas and electric?
Against a standard electric tank, a heat pump water heater typically cuts water heating electricity by roughly two-thirds. Against natural gas the answer depends on your local prices, and in provinces with low gas prices a gas tank can still cost less to run.
| Technology | Representative UEF | Energy per year | Example cost per year |
|---|---|---|---|
| Electric resistance tank | 0.92 | about 5,300 kWh | about $1,060 |
| Heat pump, heated basement | 3.0 | about 1,630 kWh | about $330 |
| Heat pump, cold basement | 2.5 | about 1,960 kWh | about $390 |
| Atmospheric gas tank | 0.62 | about 28.4 GJ | about $230 |
Those examples use the formula behind the Energy Cost Comparer: litres per day × 365 × temperature rise × 4.186 ÷ 1,000,000 ÷ UEF, converting electricity at 277.8 kWh per gigajoule. The example gas price is a commodity-only figure; enter your all-in rates, including delivery charges, to get a fair comparison for your house. Remember the winter heat-borrowing effect described above, which these simple figures do not include.
| Job | Typical installed range | What moves the price |
|---|---|---|
| Replace an electric tank with a heat pump water heater | $4,000–$7,000 | Model size, condensate drain, existing 240 V circuit |
| Replace a gas tank with a heat pump water heater | $4,500–$8,500 | New 240 V circuit or panel capacity, capping the gas line, venting changes |
06 /What rebates and rules apply to heat pump water heaters?
Rebates depend on your province and change often. When checked in September 2026, Ontario's Home Renovation Savings program listed $500 back on qualified ENERGY STAR certified heat pump water heaters, and B.C.'s Better Homes site listed rebates of up to $1,000 for homes with electric water heating anywhere in B.C., and for northern homes replacing natural gas, propane or oil water heating. In Alberta, the Clean Energy Improvement Program lists ENERGY STAR heat pump water heaters among upgrades that can be financed in participating municipalities. The water heater rebates in Canada guide keeps the full picture and the pitfalls.
On the regulatory side, Natural Resources Canada has proposed minimum efficiency standards for heat pump water heaters of UEF 2.30 for 76–208 L units and 2.50 for larger units up to 454 L, for units manufactured on or after May 6, 2029. As published when checked in September 2026, that is a proposal, not a rule in force.
07 /Is a heat pump water heater right for your house?
A heat pump water heater is usually a strong fit when you now heat water with electricity, have a basement or utility room that stays reasonably warm, have a drain nearby and can accept a steady hum. It is a weaker fit in a small closet with no ducting option, in a cold unheated space, or where gas is cheap and the house is heated by gas and you are choosing purely on running cost.
- Check the space: room volume or ducting, ceiling height, drain and 240 V circuit.
- Check the temperature of that space in January, not September.
- Size by first-hour rating and consider one size up.
- Run your own rates through the Energy Cost Comparer.
- Confirm rebate eligibility before buying, not after.
- Ask for quotes that include the drain, electrical and removal of the old unit: request them through the quote page.
FAQQuestions people ask
Does a heat pump water heater cool the basement?
Yes. It removes heat and moisture from the air around it, so the space becomes a few degrees cooler and drier. That is welcome in summer. In winter your heating system replaces part of that heat, which trims the net saving.
Is a heat pump water heater gas or electric?
Electric. It runs a compressor and fan on electricity and usually carries backup electric elements. It is sometimes called a hybrid water heater because of those two heat sources.
Is a heat pump water heater the same as tankless?
No. A heat pump water heater stores hot water in a tank like a conventional electric heater. Tankless units heat water only as it flows and have no storage.
Does a heat pump water heater need a drain?
Yes. The evaporator condenses moisture from the room air, and that water must drain to a floor drain, standpipe or condensate pump.
Are heat pump water heaters loud?
They are not silent. While the compressor and fan run, most sound similar to a dehumidifier. Placement away from bedrooms and on a solid floor helps.
How long do heat pump water heaters last?
The Tank Lifespan Predictor uses an editorial planning range of 10 to 15 years, adjusted for water hardness, flushing and anode replacement. The compressor and fan add parts a standard electric tank does not have.
Does a heat pump water heater need 240 V?
Most integrated models do. Some newer 120 V plug-in models are designed for homes without a spare 240 V circuit, usually with slower recovery. Check the spec sheet.
SOURCESSources and further reading
- Natural Resources Canada — Heat pump water heaters (ENERGY STAR)
- Natural Resources Canada — Heat pump water heaters (Energy Efficiency Regulations, proposed standards)
- Natural Resources Canada — Water Heater Guide (revised 2012, PDF)
- Save on Energy — Home Renovation Savings Program
- Better Homes BC — CleanBC Better Homes and Home Renovation Rebate programs