Heat Pump Hot Water in Canberra: Do They Work in Winter, and Are They Worth It?

Yes, heat pump hot water works in Canberra, including through frosty winters. The ACT Government’s own advice is that hot water heat pumps “have evolved significantly over the last 10 years and work well, even in the ACT’s cold climate”, and that good quality systems are the lowest running cost option for the ACT, using 55 to 80% less energy than standard electric storage or gas (ACT Government, hot water). The catch is choosing a model built for cold climates and setting it up properly.

A heat pump costs more to buy than a basic electric or gas tank, and the installed price depends on the unit, where it goes and how much electrical work your home needs. We give a free fixed-price quote after looking at the job. ACT loans, and rebates for eligible concession card holders, can bring the cost down. This guide covers how heat pumps cope with the cold, the electrical work involved, running costs against gas and electric storage, what affects the installed price, and the ACT support available. If you are ready to book, our heating and cooling page shows how we handle heat pump installs.

How does a heat pump hot water system work?

A heat pump works like a fridge in reverse. A fan draws outside air over a coil filled with refrigerant, the refrigerant absorbs heat from that air, and a compressor concentrates it and passes it into the water in the tank. Because it moves heat rather than making it from scratch with an element, it uses a fraction of the electricity of an old electric storage tank.

Most units sold for homes are either all-in-one (the compressor sits on top of the tank) or split (a separate outdoor unit, a bit like an air conditioner, piped to the tank). Split systems let you put the noisier part where it bothers no one.

Do heat pumps work in Canberra’s cold winters?

They do, but the model matters. A heat pump draws heat from the air, so on a frosty morning it has less to work with and takes longer to heat a full tank. Below a certain temperature, many units switch to a backup electric element, which costs more to run.

That is why the ACT Government’s Home Energy Support rules for hot water heat pumps require eligible models to run down to at least minus 5 degrees on the heat pump alone, and to be rated for cold (zone 5) climates. Even if you are not applying for that rebate, it is a sensible benchmark for any Canberra home.

A few practical points help in winter:

• Location. Put the unit where it gets good airflow and, ideally, some sun. A cramped side passage or a shaded corner makes it work harder.
• Timing. Set the timer to run in the warmest part of the day, usually late morning to mid afternoon, rather than overnight when it is coldest.
• Tank size. A slightly larger tank gives you a buffer for cold snaps and visitors.
• Noise. You are responsible for noise at your boundary, so keep the unit away from bedroom windows, yours and the neighbours’.

What electrical work does a heat pump need?

This is the part people often forget to budget for. Fitting a heat pump is a plumbing job and an electrical job, and the electrical side decides how well it runs.

A suitable circuit with safety switch protection

A heat pump needs its own circuit from the switchboard, with RCD (safety switch) protection. If you are replacing an old electric tank, the existing hot water circuit can sometimes be reused, but it needs to be checked and may need a new cable or protection device. If you are replacing gas, there is often no circuit at all and a new one has to be run.

Room on the switchboard

Older Canberra boards are often full, or still have ceramic fuses. If there is no space or the board cannot be made compliant, the hot water job can trigger a board upgrade. Our guide to switchboard upgrade costs in Canberra explains when that happens and what it involves. If you are planning other electric upgrades, such as induction cooking, split systems or an EV charger, it pays to plan the board once for all of them.

Off-peak, timers and solar

Many older electric tanks run on an overnight off-peak circuit. Evoenergy’s network tariffs still include off-peak controlled load options with an overnight window between 10pm and 7am (Evoenergy schedule of network charges), though some are closed to new customers. For a heat pump in Canberra, the night is the coldest time to run it. If you have rooftop solar, running it on a timer through the middle of the day usually makes more sense, because it heats the water with your own power when the air is warmest. Check your retailer’s plans before deciding, and we can wire it to suit either way.

What does a heat pump cost to run vs gas and electric storage?

Running costs depend on your household size, tariff and whether you have solar. The ACT Government’s guidance is that a good quality heat pump uses 55 to 80% less energy than a standard electric storage or gas system, and is the lowest running cost option for the ACT climate (ACT Government, hot water).

What you actually save comes down to a few things:

• How much hot water you use. A family of five with teenagers saves far more than a couple, simply because there is more water to heat.
• What you are replacing. Moving off an old electric element tank gives the biggest drop in power use. Moving off gas also removes the gas daily supply charge if hot water is your last gas appliance.
• When it runs. A heat pump running through the middle of the day on your own solar costs very little to run. One running overnight on grid power still saves, but less.

Upfront, heat pumps cost more than a like-for-like electric or gas tank. The gap usually closes over the life of the system through lower bills, and faster if the heat pump runs off your solar.

What affects the installed price of a heat pump?

We would rather give you a firm number for your home than a range that may not fit it, so we quote at a fixed price after looking at the job. These are the things that move the price:

• The unit. Tank size, brand, warranty length and cold-climate performance all matter. A model that keeps heating below zero without leaning on its backup element usually costs more, and is worth it in Canberra.
• All-in-one or split. A split system has a separate outdoor unit and more pipework and wiring between the parts.
• Where it goes. Putting the new unit where the old tank was is the simplest job. Moving it to a better spot for airflow, sun or noise means longer pipe and cable runs.
• What you are replacing. Swapping out an electric tank often lets us reuse or upgrade the existing circuit. Replacing gas usually means running a new circuit from the switchboard, and the gas line has to be capped by a licensed gasfitter.
• Your switchboard. If the board is full, has ceramic fuses or lacks safety switches, it may need work before the heat pump can go in.
• Access and base. A tight side passage, steps or a new concrete pad or slab for the unit add time.
• Rebates, certificates and loans. Federal certificates are normally taken off the price by the supplier, and ACT rebates or loans (below) can reduce or spread what you pay.

Send us a photo of your current system, where it sits and your switchboard, and we can come out, look at the job and give you a free fixed-price quote.

There is also a gas angle specific to Canberra. The ACT has prevented new gas network connections since 8 December 2023 as part of its plan to reach net zero by 2045. Existing homes can keep their gas, but if hot water is your last gas appliance, switching to a heat pump means you can close the gas account and stop paying its daily supply charge.

What ACT rebates and loans are available for heat pumps?

Schemes change, so check the current rules on the ACT Government pages before you commit. As of October 2026:

• Sustainable Household Scheme. Eligible homeowners can borrow $2,000 to $20,000 at 3% interest, repaid over up to 10 years, for products including hot water heat pumps and their installation. Previous participants are capped at $15,000 over the life of the scheme, and you need to attend a free one-hour workshop (Sustainable Household Scheme).
• Home Energy Support Program. Homeowners with a Pensioner Concession Card, DVA Gold Card or Health Care Card can get a rebate of 50% of the supply and install cost of a hot water heat pump, up to $2,500, within a $5,000 total across eligible products. Property value limits apply and you must attend a workshop. Approved households can also get a zero-interest loan of up to $10,000 (Home Energy Support rebates).
• Federal certificates. Heat pumps also attract small-scale technology certificates under the federal Small-scale Renewable Energy Scheme, which are normally taken off the price by the supplier.

Is a heat pump right for your home?

A heat pump usually makes sense if your electric tank is getting old, if you want to get off gas, or if you have solar and use little of it during the day. It may be less urgent if your current system is fairly new and working well, in which case planning the switch for when it fails is reasonable. Just do not leave it until the old tank bursts in July, when you will be tempted to take whatever is in stock.

If you are thinking about heat pump hot water alongside split systems or other electric heating, our heating and cooling page covers the full range of work we do. Send us a photo of your current hot water system and switchboard with your quote request and we can tell you what the electrical side will involve before we visit.