Best Inverter Pool Heat Pumps in Australia
Every brochure says "full inverter" now. Very few of them tell you what the unit does on a cold morning.
The best inverter pool heat pump for most Australian pools is the Guardian Platinum 25kW at $6,864. It is a full DC inverter that still delivers up to 19.9 kW at 15°C air, runs down to minus 15°C and plugs into a normal single phase supply, which makes it the safest bet for a 40,000 to 60,000 litre pool anywhere from Brisbane to Hobart.
If you want the most efficient unit rather than the strongest, the Fairland Aqua X20 wins. If you want the cheapest proper inverter, the Fairland Aqua X Essential. The full shortlist is below with the numbers that actually matter.
Want your exact size? Our pool heat pump sizing calculator works out the kW your pool needs from its volume, your city and whether you use a cover.
Short on time? See the Guardian Platinum 25kW or browse every pool heat pump we sell.
The best inverter pool heat pumps at a glance
The table lists six inverter pool heat pumps we sell, each the best pick for one job, with its headline output, sound level and price.
| Pick | Best for | Heating output | Sound at 1m | Warranty | Price |
|---|---|---|---|---|---|
| Guardian Platinum 25kW | Best overall, cold climates | 25.0 kW (19.9 kW at 15°C air) | 44 to 53 dB(A) | 25 yr heat exchanger, 5 yr compressor | $6,864 |
| Fairland Aqua X20 AX20-60C | Most efficient, quietest | 16.0 kW | 41.0 to 46.7 dB(A) | 15 yr heat exchanger and compressor, 7 yr parts | $5,876 |
| Fairland Aqua X Essential 17.1kW | Best value | 17.1 kW (11.8 kW at 15°C air) | 44.8 to 56.2 dB(A) | 5 yr | $4,607 |
| Fairland Aqua X20 AX20-90C | Big pools | 26.0 kW | 39.7 to 49.8 dB(A) | 15 yr heat exchanger and compressor, 7 yr parts | $8,715 |
| SensaHeat TDX 14kW | Tight side passages | 14.0 kW, top discharge | Not published | 25 yr heat exchanger, 8 yr compressor | $3,879 |
| Guardian Platinum 9kW | Plunge pools and spas | 9 kW | 42 to 47.5 dB(A) | 25 yr heat exchanger, 5 yr compressor | $3,046 |
Prices current as of October 2026, AUD including GST. Figures from each manufacturer's spec sheet on the product page; headline outputs are at 26°C to 27°C air.
Best inverter pool heat pump overall: Guardian Platinum 25kW
The Guardian Platinum 25kW is the best inverter pool heat pump overall because it keeps most of its output in cold air, delivering up to 19.9 kW at 15°C, for $6,864.
COP at 15°C air is 8.0 to 5.2, it keeps running down to minus 15°C, and it uses a Mitsubishi rotary inverter compressor. Sound pressure is 44 to 53 dB(A) at 1 metre and 16 to 25 dB(A) at 10 metres. It runs on 220 to 240V single phase, hardwired, at 15.57A at full output, with a titanium heat exchanger covered for 25 years.
The catch is size. It measures 1330 x 548 x 930mm and weighs 172 kg, so plan the pad and the access path before delivery day. Pick it for a 40,000 to 60,000 litre pool, a southern climate, or anyone who wants to swim in October rather than December.
View the Guardian Platinum 25kW →
Most efficient inverter pool heat pump: Fairland Aqua X20 AX20-60C
The Fairland Aqua X20 AX20-60C is the most efficient inverter pool heat pump we sell, with a COP of 22.2 to 7.3 at 26°C air and 16.0 kW of heating, for $5,876.
It is Fairland's TurboSilence range: full DC inverter compressor, spiral titanium heat exchanger, stainless steel casing, R32 refrigerant, Wi-Fi control, heating and cooling. It is also the quietest unit on this list at 41.0 to 46.7 dB(A) at 1 metre. The warranty is the strongest here: 15 years on the heat exchanger, 15 years on the compressor and 7 years on parts.
A word on that COP of 22.2. It is measured at 26°C air with the compressor barely ticking over, which is real, but it is a best case. Compare inverter units on COP at 15°C air or on seasonal COP, not the headline. Our pool heat pump COP guide explains why.
View the Fairland Aqua X20 AX20-60C →
Best value inverter pool heat pump: Fairland Aqua X Essential 17.1kW
The Fairland Aqua X Essential 17.1kW is the best value inverter pool heat pump, giving 11.8 kW at 15°C air and a seasonal COP of 7.6 for $4,607.
COP at 15°C air is 7.3 to 4.7 and input power at 15°C runs from 0.32 to 2.51 kW, which is the inverter doing its job: most of the time it sits near the bottom of that range holding temperature. It runs on 230V single phase, hardwired, with a spiral titanium heat exchanger, Wi-Fi control and a 5 year warranty on heat exchanger, compressor and parts. It is louder than the X20 at 44.8 to 56.2 dB(A).
Bigger pool? The Aqua X Essential 24kW ($5,747) gives 16.6 kW at 15°C air.
View the Fairland Aqua X Essential 17.1kW →
Best inverter pool heat pump for big pools: Fairland Aqua X20 AX20-90C
The Fairland Aqua X20 AX20-90C is the best inverter pool heat pump for a large pool on single phase power, with 26.0 kW of heating and a COP of 22.7 to 7.4 at 26°C air, for $8,715.
It keeps the X20 strengths at a bigger size: stainless casing, 39.7 to 49.8 dB(A) at 1 metre, 230V single phase hardwired, and the 15, 15 and 7 year warranty. Advised water flow is 6.5 to 8.5 cubic metres an hour, so check your pool pump can deliver that before you buy.
View the Fairland Aqua X20 AX20-90C →
Best inverter pool heat pump for tight spaces: SensaHeat TDX 14kW
The SensaHeat TDX 14kW is the best inverter pool heat pump for a narrow side passage, because it blows air straight up instead of sideways into the fence, for $3,879.
It is a 14.0 kW inverter unit with R32 refrigerant, Wi-Fi, IPX4 rating, 40mm unions and a 12.5A maximum input current, hardwired. Warranty is 25 years on the titanium heat exchanger and 8 years on the compressor. A side discharge unit jammed against a paling fence recirculates its own cold air and loses output. Top discharge fixes that. For a bigger top discharge unit with cold climate ratings, look at the Guardian Lux-V 20kW ($7,990).
Best inverter heat pump for plunge pools and spas: Guardian Platinum 9kW
The Guardian Platinum 9kW is the best small inverter pool heat pump for plunge pools and spas, at $3,046.
It shares the Platinum full DC inverter and dual vertical discharge design, draws 6.48A at full output, and runs at 42 to 47.5 dB(A) at 1 metre and 14 to 19.5 dB(A) at 10 metres. It weighs 82 kg and measures 1074 x 436 x 804mm. Small pools lose heat fast relative to their volume, and a quiet inverter that idles at low power is exactly what they want.
View the Guardian Platinum 9kW →
Is an inverter pool heat pump worth the extra money
An inverter pool heat pump is worth the extra money for most pools because it runs at part load most of the time, where its COP is far higher than a fixed speed unit cycling on and off.
A fixed speed heat pump runs flat out, hits temperature, stops, and starts again when the pool cools. An inverter ramps up to heat the pool, then throttles down to a fraction of its power to hold temperature. That second phase is where a pool heat pump spends most of its life, and it is where the savings sit. It is also why inverters are quieter at night. The longer explanation is in inverter pool heat pumps explained, and the dollar figures are in our pool heat pump running costs guide.
Where an inverter matters less: a covered pool, heated only in warm months, in Queensland. There, the Midea M Series 20kW at $3,799 is our top seller. It is rated at 21.8 kW at a COP of 5.2 and 17.0 kW at a COP of 3.6 in lower ambient air. Midea publishes only a headline rating and a lower ambient rating, not the full part load COP range the units above publish, so it sits outside this shortlist. It is still a lot of heat pump for the money.
How to compare inverter pool heat pumps
Compare inverter pool heat pumps on output at 15°C air, COP at 15°C air, sound and warranty, in that order.
Output at 15°C air
Output at 15°C air is the number that decides whether your pool gets warm in spring and autumn. Headline outputs are measured at 26°C or 27°C, which flatters every unit. The Guardian Platinum 25kW drops to 19.9 kW at 15°C and the Fairland Essential 17.1kW drops to 11.8 kW. Size on the cold figure.
COP at 15°C air
COP at 15°C air tells you what you will pay when you most want heat. A COP of 5 means 1 kW of electricity makes 5 kW of heat. Headline COPs of 14 or 22 are measured at low output in warm air and are not comparable between brands.
Sound and warranty
Sound should be compared at the same distance, usually 1 metre, and as a range from low to full output. Warranty matters more than most buyers think on a machine that lives outside: look at compressor years, not just heat exchanger years.
Frequently asked questions
What is the best inverter pool heat pump in Australia?
The best inverter pool heat pump for most Australian pools is the Guardian Platinum 25kW at $6,864, because it delivers up to 19.9 kW at 15°C air and runs down to minus 15°C on single phase power. The Fairland Aqua X20 AX20-60C is the most efficient and quietest pick, and the Fairland Aqua X Essential 17.1kW at $4,607 is the best value (prices as of October 2026).
Is an inverter pool heat pump better than a standard one?
An inverter pool heat pump is better than a standard fixed speed unit for most pools because it throttles down to hold temperature at a much higher COP, which lowers running cost and noise. A fixed speed unit can still make sense for a covered pool heated only in warm months.
How much does an inverter pool heat pump cost in Australia?
An inverter pool heat pump costs from about $3,000 for a 9 kW unit to $6,000 to $9,000 for a 16 to 26 kW premium unit in Australia, as of October 2026, plus electrical installation by a licensed electrician.
Are Fairland inverter pool heat pumps any good?
Fairland inverter pool heat pumps are a strong choice, with the Aqua X20 range offering COPs up to 22.7 at 26°C air, 15 year compressor and heat exchanger warranties and sound from 39.7 dB(A) at 1 metre. The cheaper Aqua X Essential range carries a 5 year warranty and is the value option.
What size inverter pool heat pump do I need?
Most Australian pools need about 0.3 to 0.7 kW of heat pump per 1,000 litres, depending on climate, season and whether the pool is covered, so a 40,000 litre pool usually needs 15 to 27 kW. Use the output at 15°C air when sizing, and check with our sizing calculator.
Want a straight answer on which inverter to buy?
Send us your pool volume, your suburb, whether you have a cover, how close the unit will sit to a fence or window, and when you want to swim. We will pick the inverter that fits and tell you if a cheaper unit will do the job.
Comparing every type, not just inverters? See our best pool heat pumps in Australia roundup, or contact us.
This guide is general information for Australian pool owners and is not a substitute for advice on your specific pool and site. Sizing figures are rules of thumb. Pool heat pumps are electrical appliances and must be installed by a licensed electrician on a suitably rated circuit. Confirm final sizing with us before you buy.