A hot water heat pump uses about 1.5 to 4 kWh of electricity per day. Because it extracts heat from the surrounding air instead of generating it, a heat pump typically uses 60% to 75% less electricity than a conventional electric-element hot water system.
That works out to an annual draw of roughly 1,000 kWh, compared with 4,000 kWh or more for an electric water heater or element-based model.
Over the long run, that difference is where the real energy savings show up.
For most households, this is the single biggest reason to switch from electric hot water or gas heating, and it helps to understand exactly where those savings come from.
How Much Power a Hot Water Heat Pump Uses Per Day
Most heat pump water heaters sit in the 1.5 to 4 kWh per day range. In a mild climate like Perth, the typical figure lands around 3 to 5 kWh per day, and a well-sized unit in warm conditions can run on as little as 1 to 2 kWh per day.
The reason for the range is simple, and it comes down to how a heat pump works.
It does not create heat directly. It moves it. A compressor draws in warm air, passes it over a heat exchanger, and, with the help of an expansion valve, transfers that heat energy into the cold water inside the water storage tank.
The warmer the air, the less work the system has to do, using less energy overall, which is why daily energy consumption shifts with the season and your location.
Hot water heating accounts for about 23% of the average home’s energy use, so trimming that figure has a real effect on your overall hot water consumption and your electricity bill.
What Affects How Much Power Your Heat Pump Uses
No two households run the same.
The following factors decide where your system lands in the daily kWh range:
Household Size and Hot Water Usage
Hot water usage climbs with the number of people in the home.
More showers, more washing, and more dishwashing all mean the hot water tank reheats more often, which lifts daily energy consumption and pushes up your energy costs.
Choosing the right size for your household keeps the system working efficiently rather than constantly playing catch-up. It matters most in homes with heavy daily hot water use.
Our guide on what size heat pump you need walks through it.
Water Temperature Settings
Running a heat pump at 60°C requires slightly more energy than heating to a lower temperature. Many storage water heaters are set to 60°C for hygiene reasons, but the higher the target water temperature, the harder the compressor has to work to reach it.
In hard water areas, mineral build-up on the element can nudge that energy use higher too.
Climate and Cold Weather
Heat pumps pull heat from the air, so colder air means more effort. Modern air source heat pumps still operate efficiently in temperatures as low as -10°C, and in Perth’s mild climate they perform well throughout the year.
Even across cooler climate zones, a quality unit keeps delivering results, and some models are split systems that separate the tank and compressor to suit tighter spaces.
In genuinely cold weather, some heat pump systems briefly engage a backup heating element to keep up with demand, which temporarily lifts the power draw.
Placement and Air Temperature
Because the system extracts heat from the surrounding air, placement matters. Installed in a garage, basement, or utility room, a heat pump will also act as a mild dehumidifier and can make the immediate space feel slightly cooler.
Giving the unit good airflow and a reasonable air temperature helps it stay in its most efficient operating band.
How to Reduce Your Heat Pump Running Costs
A few small habits reduce costs and keep daily power use at the lower end of the range:
- Schedule heating for the middle of the day to soak up power from your solar panels, or overnight if you are on an off-peak rate.
- Insulate your hot water pipes, which reduces heat loss and the number of times the tank needs to reheat.
- Avoid setting the water temperature higher than you actually need.
- Give the unit clear airflow so it draws warm air easily and works efficiently.
- Size the system to your household so it is not reheating a half-empty tank.
A heat pump is not the same as solar water heaters, which use solar collectors on the roof to warm water directly, but both can run on solar electricity for very low running costs.
In fact, heat pumps are often recommended alongside solar PV systems, so your panels can power the unit through the middle of the day.
If you would like a clear answer on how much power the right system would use in your home, the team at Eurosun can help you compare hot water heat pumps and size one to your household.
What Coefficient of Performance (COP) Tells You About Energy Use
A COP of 3.0 to 4.0 means the system delivers 3 to 4 units of heat for every 1 unit of electricity it consumes. A good heat pump can push efficiency beyond 600% in warm conditions, something no electric element can approach, because a resistance heater is capped at a one-to-one ratio.
This is why a heat pump can be around three times more energy efficient than a standard electric heater while heating the same volume of hot water, and why it works so efficiently on so little power.
Does a Heat Pump Use Power All Day?
No. A heat pump hot water system does not run around the clock. The compressor cycles on only when the tank needs reheating, then switches off once the water is up to temperature.
Across a normal day, that adds up to a few short bursts rather than constant draw, which makes it easy to see how much energy you are really using. By contrast, electric hot water systems typically run for 3 to 5 hours daily to keep a tank hot.
This is where your tariff comes in. If you are on a controlled load or off-peak rate, you can set the system to heat during the cheaper hours and keep running costs down.
Better still, a simple timer lets you target the middle of the day, so the unit heats while the sun is out. That small scheduling choice can noticeably change how much your hot water actually costs to run.
Is Your Current Heat Pump Draining Your Energy Bills? Contact Eurosun Today!
The right hot water heat pump can quietly trim your power bill every single day.
But the wrong size, the wrong settings, or an ageing element system will keep costing you more than it should.
If you are not sure how much power your current setup is using, or how much you could save, the team at Eurosun can help.
We will compare hot water heat pumps, size one to your household, and walk you through the rebates available in WA.
Get in touch with Eurosun today and find out how little your hot water could cost to run.