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Heat pump water heaters in Waterloo: do they work here, and how does the Home Renovation Savings rebate apply?

A heat pump water heater works in Waterloo, but it is a different appliance from a gas tank and it suits a different house. It pulls heat out of the basement air to heat the water, so it wants an open, unfinished space and a drain, and the Home Renovation Savings rebate for it is only available through the program's home energy assessment pathway, as one of at least two upgrades.

Last updated October 24, 2026 · Reviewed by the Waterloo Water Heater team

What is a heat pump water heater and how does it work?

A heat pump water heater is an electric storage tank with a small heat pump mounted on top. Natural Resources Canada describes the technology plainly: it does not generate heat directly, it moves heat from one place to another, drawing it from the air in a basement or utility room and transferring it into the water in the tank. Most units also carry conventional electric elements as a backup for heavy demand.

The efficiency gain is the whole point. NRCan says an ENERGY STAR certified heat pump water heater can be up to four times more efficient than a standard electric water heater and, on average, uses up to 70 percent less energy than one. Against a standard electric tank in an Uptown Waterloo condo, that is a large difference in the hydro bill. Against a gas tank the comparison depends on gas and electricity rates, which this post does not try to settle.

Where it fits in a Waterloo house

Because the unit pulls heat from the air around it, where you put it matters more than with any other water heater.

• Space and air. It wants a reasonably large, open room to draw from. A small closed closet starves it and it falls back on the electric elements. An unfinished basement in a Columbia Forest two-storey is a good candidate; a tight closet in a Lakeshore side-split is not, unless the installer ducts the intake and exhaust.
• It cools and dries the room. NRCan notes that because the unit removes heat from the air, you need less air conditioning in summer. The flip side is that in winter it is taking heat your furnace paid for, which NRCan describes as making the technology less beneficial in the winter when space heating is required. In a Waterloo basement that is damp in summer the dehumidifying is a real bonus; in winter the furnace works slightly harder.
• Condensate. Pulling heat out of air produces water, and the unit needs a drain or a condensate pump.
• Noise. There is a compressor and a fan. In a mechanical room it is unremarkable; next to a bedroom in a finished basement apartment in Northdale it may not be.
• Electrical. It is a 240-volt appliance, so the circuit is an Electrical Safety Authority matter and a licensed electrical contractor's work, not the gas technician's.
• Height. The heat pump on top makes the unit taller than the tank it replaces. Measure the ceiling.

Does the Home Renovation Savings rebate cover heat pump water heaters in Waterloo?

Yes, but only through the assessment pathway. The Home Renovation Savings program is delivered by Save on Energy and Enbridge Gas with Ontario government support, and the program says homeowners can access it whether they heat with electricity, natural gas, oil, propane or wood. It has two streams. The single-upgrade stream needs no assessment and covers items such as cold climate air source heat pumps, smart thermostats and attic insulation. The bundle stream is where heat pump water heaters sit, alongside insulation, windows and doors and air sealing, and the program's own wording is to start with a home energy assessment, then complete two or more upgrades to receive your rebates.

The steps on the program's assessment page are:

1. Before beginning any work, complete an initial home energy assessment with a registered energy advisor from an approved service organization.
2. Receive the advisor's report and choose at least two recommended upgrades.
3. Have your preferred contractor complete the work.
4. Complete a final assessment with the same registered energy advisor.
5. The rebate is paid after the advisor submits the documents, within roughly 30 days by e-transfer or 60 days by cheque according to the program.

The equipment requirement is an ENERGY STAR certified domestic heat pump water heater replacing your existing water heater, whether that was gas, electric, propane or oil. If you have tenants, the owner applies. The program also warns about scammers impersonating participating contractors and service organizations, so verify anyone who approaches you. Program terms change and this site is not the program; confirm the current rules with Save on Energy before ordering a unit on the strength of a rebate. A single heat pump water heater on its own, with no assessment and no second upgrade, does not qualify under the structure as published.

What else is finished or different

The federal Canada Greener Homes Grant, which paid for many Ontario water heater and insulation upgrades, is closed. Natural Resources Canada's Ontario page states the program is closed and that December 1, 2025 was the deadline for Ontario applicants to complete their post-retrofit evaluation, so it is not something to plan around in 2026. Note also that Waterloo's gas utility is Enbridge, not Kitchener Utilities, so a Kitchener-specific rebate you may have read about does not apply at a Waterloo address.

Heat pump versus gas tank versus tankless

A heat pump water heater is the right answer when the house is electric already, when you are removing gas appliances, or when the basement is open and the hydro savings against a plain electric tank matter. A gas tank replacement remains the simplest swap in a house with a sound gas tank and a good vent. A gas tankless unit suits a household that runs out of hot water and will keep up with descaling in the Region's hard water. Hard water affects a heat pump unit too; it is still a tank, and it still wants a yearly flush and a softener ahead of it.

What this means for your quote

Tell the contractor we book for Waterloo three things: what you have now, whether the basement is open or finished, and whether you intend to go through the Home Renovation Savings assessment. If you do, the assessment comes before any work, so the order is advisor first, quote second, install third. The Waterloo water heater cost guide sets out planning ranges for each type, and you can describe your setup here to find out whether a heat pump unit is a sensible fit for your house or a solution looking for a problem.

Sources

• Heat pump water heaters - Natural Resources Canada
• Guide to residential water heaters - Natural Resources Canada
• Home Renovation Savings - Save on Energy
• Bundle upgrades and save (assessment pathway) - Home Renovation Savings
• Closed: Greener Homes Grant - Ontario - Natural Resources Canada