Are Pool Heat Pumps Worth It?
The honest answer from people who sell them for a living, not the marketing version.
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Is a pool heat pump worth it? Yes, a pool heat pump is worth it for most Australian pool owners who want more than eight weeks of swimming a year. It costs more upfront than gas or an electric element heater, but it runs so much cheaper that it usually pays that gap back within one to three seasons, and then keeps saving you money for the next ten to fifteen years. The exception is if you only ever swim in January and February anyway, in which case you may not need heating at all.
What does a pool heat pump actually cost to buy?
A pool heat pump for an average Australian backyard pool runs from around $2,500 for a 9kW unit suited to a small pool or spa, up to $6,000 to $9,000 for a 28kW to 35kW unit on a large family pool. Our most popular size, the Midea M Series 20kW, sits in the middle of that range and covers most standard 30,000L to 40,000L pools. Prices current as of August 2026, AUD including GST.
That is more than a basic electric element heater and roughly in line with a gas heater once you add gas line installation. The heat pump is not the cheap option to buy. It is the cheap option to run, and running cost is where the real money moves.
Where the payback actually comes from
The payback comes from electricity use, not from the heat pump itself doing anything clever. A heat pump moves heat out of the air into your pool instead of generating it from scratch, so it uses a fraction of the energy that gas or resistive electric heating burns for the same warmth. That ratio is called COP, and a decent pool heat pump delivers five or six units of heat for every one unit of electricity it draws.
Run the comparison over a season and it is not close. Gas heating a mid-size pool for a full season can run $1,500 to $3,000 in bottled or reticulated gas, depending on your region and how many months you push it. The same pool on a correctly sized heat pump typically lands at $300 to $700 in electricity for the same stretch. That gap is where the purchase price difference gets clawed back, usually inside two seasons.
How long is the actual payback period?
For most Australian homes swapping from gas, the payback period lands between one and three pool seasons. Someone spending $2,000 a year on gas who moves to a heat pump running $500 a year saves $1,500 annually, so a $6,000 unit pays for itself in four years and then runs at a profit for the rest of its 10 to 15 year lifespan. Someone comparing against never heating at all is a different sum: there the "cost" is really the value of the extra months you get to swim, which is harder to put a number on but easy to feel the first time you're in a 28 degree pool in October.
An inverter model such as the Guardian Platinum inverter range sharpens the payback further. Instead of switching on and off at full power, it throttles down once the pool is warm, so it sips electricity holding temperature rather than cycling hard. That shaves another 20 to 30 percent off running cost compared with a fixed-speed unit, at a higher purchase price, so the payback maths shifts case by case.
What actually changes the numbers for your pool
Pool cover or no cover
A pool cover is the single biggest lever on running cost, bigger than the heat pump model you choose. An uncovered pool loses most of its heat overnight through evaporation, so the heat pump reheats the same water every morning. Cover it and that heat stays put. A covered pool can run a size smaller heat pump and a noticeably lower power bill for the same water temperature.
How many months you want it warm
Heating December through February only is a small ask for any heat pump. Stretching the season into September and April, which is the main reason people buy a heat pump in the first place, pushes running hours up and changes the payback sum. If you want a long season, size up rather than push a small unit hard, because an undersized unit running flat out is where the running cost blows out.
Your electricity tariff
A heat pump running mostly on daytime solar export or an off-peak tariff costs a fraction of one running on standard peak rates. If you have solar, this is where a heat pump earns its keep twice over. See our guide on running a heat pump on solar for the detail.
Where a heat pump is not the right call
Solar pool heating beats a heat pump on running cost, because sun is free and a heat pump still draws electricity even at a good COP. If your roof or pool orientation suits solar heating and you are patient with the slower, weather-dependent warm-up, that is the cheaper option. We cover the trade-off properly in our solar vs heat pump comparison. A heat pump also has less to offer if you genuinely only swim eight weeks a year in peak summer, since the water is often warm enough on its own and heating adds a bill for a marginal comfort gain.
Heat pump vs gas vs electric, side by side
| Heating type | Typical purchase cost | Typical seasonal running cost | Lifespan |
|---|---|---|---|
| Pool heat pump | $2,500 to $9,000 | $300 to $900 | 10 to 15 years |
| Gas heater | $2,000 to $5,000 plus gas line | $1,500 to $3,000 | 7 to 10 years |
| Electric element heater | $500 to $1,500 | $2,500 to $4,500 | 5 to 8 years |
| Solar pool heating | $3,000 to $6,000 | Near zero (pump power only) | 15 to 20 years |
Full breakdown of these numbers in our gas vs electric vs heat pump comparison.
Does the size you buy change whether it is worth it?
Yes, sizing correctly is what makes the payback maths work at all. An undersized heat pump never quite reaches temperature, so it runs continuously trying to catch up, which is the single fastest way to blow out a power bill and shorten the unit's life. A correctly sized unit reaches temperature and then idles. If you are not sure what size your pool needs, our pool heat pump sizing guide walks through it by litres, cover and climate.
Frequently asked questions
Is a pool heat pump worth it in Australia?
For most Australian pool owners who want a season longer than peak summer, yes. The running cost savings over gas or electric heating typically repay the higher purchase price within one to three seasons, and the unit keeps saving money for a decade or more after that.
How long does a pool heat pump take to pay for itself?
Most households moving from gas see payback in one to three pool seasons, depending on pool size, how many months they heat and their electricity tariff. Households comparing against no heating at all are paying for extra swimming months rather than a straight cost saving.
Is a heat pump cheaper to run than a gas pool heater?
Yes, substantially. A heat pump moves heat rather than burning fuel to make it, so it typically costs a third to a fifth of what gas heating costs for the same pool over a season.
Do pool heat pumps really save money long term?
Yes, provided the unit is sized correctly for the pool and used with reasonable habits like a pool cover. Oversized power bills almost always trace back to an undersized heat pump running flat out or an uncovered pool losing heat overnight, not the technology itself.
Is it worth buying an inverter pool heat pump instead of a standard one?
It depends on how long you plan to run it each season. An inverter model costs more upfront but uses less power holding temperature, so it pays back its price premium faster the longer your heating season runs. For a short summer-only season, a standard fixed-speed unit is often the better value.
Want the numbers for your own pool?
Tell us your pool volume, whether it is covered, your postcode and how many months you want it warm, and we will tell you which model pays itself off fastest for your situation.
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Comparing against solar first? Read solar vs heat pump pool heating. Or browse the complete Heat Pumps collection.
This guide is general information for Australian pool owners and is not a substitute for advice on your specific pool and site. Pool heat pumps are electrical appliances and must be connected by a licensed electrician. Confirm final sizing and expected running cost with us or your pool professional before you buy.