Yes, as long as you buy one built for the cold. The ACT Government's own advice for its rebate program says that because of Canberra's extreme winters you should look at models rated for zone 5 climates with an energy saving of at least 65 per cent, and check the unit can operate down to minus 5 degrees on the heat pump alone. Buy to that spec and you will have hot water on a frosty morning. Buy the cheapest box on the shelf, which was probably designed for Brisbane, and it will lean on its electric element every cold morning while you pay for the privilege.
That is the whole argument in one paragraph. The detail below is about how they work, what the ACT will pay towards one, and where they are the wrong answer.
How does a heat pump hot water system work?
It is a fridge running backwards. A fan pulls outside air across an evaporator, a refrigerant picks up the heat in that air, a compressor squeezes the refrigerant so it gets hotter still, and that heat goes into the water in the tank. You are moving heat rather than making it, which is why a heat pump uses roughly a third of the electricity of a standard electric element to deliver the same hot water.
The number describing that is the coefficient of performance, or COP. A COP of 4 means four units of heat out for one unit of electricity in. Two things about COP figures on a brochure. They are measured at a set air temperature, so the number you see is not the number you get at 5am in July. And they fall as the air gets colder, because there is less heat in cold air to harvest. That is the entire reason the ACT guidance points at zone 5 models and a minus 5 degree operating floor.
What happens on a sub-zero Canberra morning?
Three things, depending on the unit. A well specified system keeps running on the compressor alone, more slowly and less efficiently than it would in March, but it still heats. A borderline system switches over to its electric backup element, at which point it is an ordinary electric hot water service and your running cost jumps. A poorly chosen system may stop the compressor entirely below its minimum operating temperature and run on the element until the air warms up.
All of them also run a defrost cycle, because pulling heat out of near-freezing air puts frost on the evaporator coil. That is normal. A heat pump that appears to pause and drip water on a cold morning is usually defrosting, not broken.
Two practical consequences for Canberra homes. Size the tank so most of the heating can happen in the warmer part of the day, and put the unit somewhere it gets air movement and sun rather than in a shaded, sheltered corner on the south side of the house. In the frost hollows around Tuggeranong and Weston Creek that siting decision does real work.
What rebates and loans apply to heat pump hot water in the ACT?
Two ACT programs, and they stack. Amounts and eligibility change, so check the official pages rather than taking a supplier's word for it.
| Program | What it gives you | Who can use it |
|---|---|---|
| Home Energy Support: Rebates for Homeowners | 50% of supply and installation for a hot water heat pump, capped at $2,500. Up to $5,000 per property across both product categories | Homeowners with a Pensioner Concession Card, DVA Gold Card or Health Care Card who live in the home, have attended a free workshop, and are under the unimproved value thresholds |
| Sustainable Household Scheme | Loan from $2,000 to $20,000 over up to 10 years. 3% for households as at August 2026, or zero interest up to $10,000 for Home Energy Support participants | ACT residents who own a home and meet the scheme guidelines and the lender's credit criteria |
Three conditions catch people out. The model has to appear on the Victorian Energy Upgrades register under "Water heater - Heat pump", which the ACT uses as its product list. The installer has to be an approved supplier under the Sustainable Household Scheme. And for the rebate you need written pre-approval from the ACT Government before the unit goes in, because you cannot claim after installation.
The Sustainable Household Scheme changed on 1 July 2026, when the loan limit moved to $20,000 for new applicants. Earlier participants stay on the previous $15,000 limit over the life of the scheme. That is the kind of detail worth confirming on the day you apply.
Is a heat pump cheaper to run than gas hot water in Canberra?
Usually, but the honest answer depends on one question: is hot water your last gas appliance? Gas costs you a daily supply charge whether you burn any or not. If the hot water system is the only thing left on gas, replacing it lets you close the account or have the connection abolished, and dropping that supply charge is often a bigger saving than the difference in energy use. If you still have ducted gas heating and a gas cooktop, that charge continues either way and the case rests on the water heating alone.
Rather than quote a figure that will be stale in a month, use the ACT Government's Make Your Next Choice Electric tool. It estimates replacement costs and annual bill savings for your own appliances. For the wider comparison, our guide to gas, electric, solar and heat pump hot water sets the four types side by side.
How loud is a heat pump, and where should it go?
It runs a compressor and a fan, so while it is heating it sounds roughly like a small split system outdoor unit. Most of the complaints I hear about come down to siting rather than the appliance. The ACT Government has flagged noise from electrification appliances including heat pump hot water as an issue it expects to manage, especially where units end up close to boundaries in denser areas.
What that means when we pick a spot: away from bedroom windows, yours and next door's, the clearances in the manufacturer's instructions rather than jammed against a wall, a solid level base, and the condensate run to a legal discharge point. Heat pumps produce condensate the way an air conditioner does, and a hose left to dribble onto a paved area becomes an ice hazard in a Canberra July.
Who should not switch to a heat pump?
They are not right for every house, and anyone who tells you otherwise is selling one.
- Homes with nowhere sensible to put it. Small courtyards, tight townhouse plant areas and internal cupboards rule out a lot of units, because they need air flow and a drain.
- Households that need a lot of hot water fast. A heat pump reheats more slowly than gas continuous flow, so tank size and recovery matter more than they used to.
- Apartments and unit title properties, where the works often need owners corporation consent and the plant space is not yours to use.
- Anyone whose existing gas unit died this morning and needs hot water tonight. A like for like gas replacement is the fast fix. If you want to plan a heat pump properly, the ACT rebate process alone takes time because of the pre-approval step.
What is involved in the changeover?
More than swapping a box over, which is why the quotes vary so much. The old unit comes out and gets disposed of. If it was gas, a licensed gas fitter caps and decommissions the gas connection to that appliance. The new unit needs a base, a tempering valve set to deliver water at a safe temperature to the bathroom outlets, a new relief valve drain line, and a condensate line. An electrician runs a circuit if there is not a suitable one already, and older switchboards sometimes need work first.
The other thing to sort out early is whether you are keeping gas at all. If your place is on an existing gas connection you can still replace gas with gas, and you can still get a new gas appliance connected. If you are building, that choice is gone: our explainer on the ACT rules on new gas connections covers why new homes in most Canberra zones have to be all electric. We handle both sides of it, from hot water system replacement to gas fitting and decommissioning.
One last thing before winter. Whatever system you end up with, insulate the pipework and know where your isolation valve is. Our Canberra winter plumbing guide goes through the rest of it.
Where these details come from
- ACT Government: hot water heat pumps under the Home Energy Support Program, including the zone 5 and minus 5 degree guidance and the product register requirement.
- Home Energy Support: Rebates for Homeowners for rebate caps and eligibility.
- Sustainable Household Scheme for current loan limits, the interest rate and the 1 July 2026 changes.
- Integrated Energy Plan 2024-2030 on appliance noise and the phase out of fossil fuel gas by 2045.
Thinking about a heat pump?
We will look at the spot, the tank size and the electrics, and give you an upfront price. Straight advice if it is not the right fit.