Best Pool Heat Pump for Small Pools and Plunge Pools
Small pools do not need a small budget mistake. Here is what to buy for a plunge pool, and the one size to skip.
The best heat pump for a plunge pool or small pool is the Fairland AquaX Essential 11kW at $3,182. It is a full inverter unit that still makes 7.8 kW at 15°C air, plugs into a 10 amp outlet, and at 349 mm deep it fits the narrow side passages that plunge pools tend to come with.
On a tight budget, the 7.5kW Fairland at $2,645 handles a true plunge pool with a cover. For cold climates, the Guardian Platinum 9kW keeps going down to minus 15°C. Every pick below is a live product at its real price.
Want your exact size? Our pool heat pump sizing calculator uses your pool size, postcode, cover and swimming season to work out the kW you need, then shows the heat pumps that fit.
Short on time? See the Fairland 11kW, the budget Fairland 7.5kW, or browse every pool heat pump we sell.
The best small pool heat pumps at a glance
The table below lists six small pool heat pumps, ranked for plunge pools and pools under about 20,000 litres.
| Pick | Best for | Headline output | Output at 15°C air | Noise at 1 m | Price |
|---|---|---|---|---|---|
| Fairland AquaX Essential 11kW | Best overall | 11 kW | 7.8 kW | 41.3 to 53.4 dB(A) | From $3,182 |
| Fairland AquaX Essential 7.5kW | Cheapest, covered plunge pools | 7.5 kW | 5.3 kW | 38.8 to 50.8 dB(A) | From $2,645 |
| Guardian Eco Pulse 9kW | Best warranty for the money | 8.91 kW | 6.6 kW | 40 to 52 dB(A) | $2,690 |
| Guardian Platinum 9kW | Cold climates, quietest at full power | 9.5 kW | 7.5 kW | 42 to 47.5 dB(A) | $3,046 |
| SensaHeat TDX 11kW | Tight spots against a wall | 11 kW | Not published | Not published | $3,150 |
| Fairland AquaX Essential 13.8kW | Small pools with no cover | 13.8 kW | 9.8 kW | 41.8 to 54.2 dB(A) | From $3,706 |
Prices current as of November 2026, AUD including GST. Fairland prices vary by state: the "from" price is the NSW, VIC and ACT price. Check the product page for your state.
What size heat pump does a plunge pool need?
A plunge pool usually needs a 7.5 kW to 11 kW heat pump, depending on whether it has a cover and how cold your climate is. Most plunge pools hold 5,000 to 15,000 litres. Length by width by average depth by 1,000 gives you the volume, so a 4 m by 2.5 m plunge pool at 1.4 m deep is 14,000 litres.
| Pool volume | With a cover | No cover |
|---|---|---|
| Up to 8,000L | 7.5 kW | 9 kW |
| 8,000 to 15,000L | 9 kW | 11 kW |
| 15,000 to 20,000L | 11 kW | 13 to 14 kW |
Those bands are our rule of thumb for a moderate Australian climate, not a standard. Colder climates and longer seasons push you up a row. Use the full pool heat pump size chart if your pool is bigger.
Here is the part people miss. Plunge pools get used hotter than family pools. Plenty of owners run them at 32°C or more, closer to a spa than a pool. Small water also loses heat quickly, because a plunge pool has a lot of surface and wall for its volume. So do not size a plunge pool on litres alone, and do not leave the cover off. Our guide on pool covers with a heat pump has the detail.
Best heat pump for a plunge pool overall: Fairland AquaX Essential 11kW
The Fairland AquaX Essential 11kW is the best heat pump for a plunge pool because it gives the most usable heat per dollar of any small unit we stock. At 15°C air it still makes 7.8 kW, with a COP of 7.3 to 4.8. It has a SCOP of 7.3, Wi-Fi control, heating and cooling, and a 5 year warranty on the heat exchanger, compressor and parts.
Three things make it suit a small pool. It runs on 230V single phase from a 10 amp plug connection. The body is 872 x 349 x 654 mm and 47 kg, so it slides into spots a bigger unit will not. And it holds 41.3 dB(A) at 1 metre when it is idling along.
Now the quirk. As of November 2026, the 11kW costs less than the 8.8kW in the same range, in every state we list. Same cabinet, more output. So skip the 8.8kW unless something changes.
Who it suits: plunge pools, courtyard pools and small family pools up to about 15,000 litres, or 20,000 litres with a cover.
Who it does not suit: anyone who wants a longer warranty on the heat exchanger. Guardian has that covered below.
See the Fairland AquaX Essential 11kW, from $3,182 →
Cheapest good heat pump for a plunge pool: Fairland AquaX Essential 7.5kW
The Fairland AquaX Essential 7.5kW is the cheapest full inverter heat pump worth buying for a plunge pool, from $2,645. It has the same 872 x 349 x 654 mm body and 10 amp plug connection as the 11kW, and it is the quietest unit on this list at the low end, at 38.8 dB(A) at 1 metre.
The limit is output. At 15°C air it makes 5.3 kW, so it suits a covered plunge pool in a mild climate. Put it on an uncovered 15,000 litre pool in Melbourne in October and it will spend its life flat out. Spend the extra $537 on the 11kW if you are anywhere near that line.
See the Fairland AquaX Essential 7.5kW, from $2,645 →
Best warranty for the money: Guardian Eco Pulse 9kW
The Guardian Eco Pulse 9kW is the small pool heat pump to buy for warranty cover, with 25 years on the heat exchanger and 5 years on the compressor at $2,690. It makes 6.6 kW at 15°C air, between the Fairland 7.5kW and the 11kW, and it has a COP of up to 14.2 at warm air. Noise runs from 40 to 52 dB(A) at 1 metre.
It is a similar size to the Fairland at 934 x 360 x 582 mm, lighter at 41 kg, and it still runs from a 10 amp plug connection. Guardian does not publish a minimum operating temperature for the Eco Pulse, so for genuinely frosty sites the Platinum is the safer pick.
See the Guardian Eco Pulse 9kW, $2,690 →
Best small pool heat pump for cold climates: Guardian Platinum 9kW
The Guardian Platinum 9kW is the best small pool heat pump for Canberra, Hobart and cold Victorian sites, because it runs down to minus 15°C with automatic defrost. It makes 7.5 kW at 15°C air, carries a COP of up to 16.1, and has 25 years on the titanium heat exchanger and 5 years on the compressor. At $3,046 it is a fair step up.
It is also the quietest unit here at full power, topping out at 47.5 dB(A) at 1 metre, which matters when the plunge pool sits right under a bedroom window. The trade off is size. At 1074 x 436 x 804 mm and 82 kg, it needs more room and more hands than the rest. More on noise in our quietest pool heat pumps guide.
See the Guardian Platinum 9kW, $3,046 →
Best for tight spots: SensaHeat TDX 11kW
The SensaHeat TDX 11kW is the best small pool heat pump for a spot hard against a wall, because its top discharge fan blows up and saves wall clearance. It gives 11 kW of heating, has built in Wi-Fi and a Mitsubishi DC compressor, and carries 25 years on the heat exchanger and 8 years on the compressor at $3,150.
It is squarer than the others at 710 x 753 x 693 mm and 61 kg, so it suits a corner rather than a side passage. Our listing does not publish its output at 15°C air or its noise figures, so compare it on layout, not on those numbers.
See the SensaHeat TDX 11kW, $3,150 →
Small pool with no cover: Fairland AquaX Essential 13.8kW
The Fairland AquaX Essential 13.8kW is the pick for a small pool that will never have a cover, from $3,706. It makes 9.8 kW at 15°C air in the same 349 mm deep body, but it needs a 15 amp plug connection rather than 10 amp, so get your electrician to check the supply first.
See the Fairland AquaX Essential 13.8kW, from $3,706 →
How long a small heat pump takes to warm a plunge pool
A small heat pump takes about a day to lift a 14,000 litre plunge pool by 10°C. It takes roughly 16 kWh of heat to raise that much water by one degree, so a unit making 7.8 kW needs about 2 hours per degree at 15°C air, and a unit making 5.3 kW needs about 3 hours. These are textbook figures that ignore heat losses, so expect longer in practice, and much longer without a cover.
| Unit | Output at 15°C air | Hours for a 10°C rise, 14,000L |
|---|---|---|
| Fairland 7.5kW | 5.3 kW | About 31 |
| Guardian Eco Pulse 9kW | 6.6 kW | About 25 |
| Guardian Platinum 9kW | 7.5 kW | About 22 |
| Fairland 11kW | 7.8 kW | About 21 |
| Fairland 13.8kW | 9.8 kW | About 17 |
Water has to be moving through the heat pump for any of this to work, so your filtration pump has to run while it heats. If the old pump is on its last legs, look at our swimming pool pumps at the same time.
Plunge pool or spa?
A spa with a SpaNET SV controller is better served by a dedicated spa heat pump than by a pool unit. The Spanet 9.0kW SV Series at $2,850 connects straight to the spa controller and heats up to 40°C. If your plunge pool runs a standard pool filter, stay with a pool heat pump. Our heat pump for spa guide walks through the choice.
Frequently asked questions
What is the best heat pump for a plunge pool in Australia?
The Fairland AquaX Essential 11kW is our pick for most Australian plunge pools, from $3,182 as of November 2026. It makes 7.8 kW at 15°C air, plugs into a 10 amp connection, and its 349 mm deep body fits narrow side passages.
What size heat pump do I need for a 10,000 litre plunge pool?
A 10,000 litre plunge pool needs about a 9 kW heat pump with a cover, or about 11 kW without one, in a moderate Australian climate. Go up a size for a cold climate, a long season or a pool you keep above 30°C.
Can you run a pool heat pump on a 10 amp plug?
Yes, smaller pool heat pumps can use a 10 amp plug connection. The Fairland 7.5kW and 11kW and the Guardian 9kW units are listed with a 10 amp plug, while the Fairland 13.8kW needs 15 amp. A licensed electrician should confirm the circuit and the outdoor connection.
Can a pool heat pump cool a plunge pool?
Yes, reverse cycle pool heat pumps can cool as well as heat. The Fairland AquaX Essential 11kW lists 4.0 kW of cooling capacity and the 7.5kW lists 2.5 kW. They are built to take the edge off a warm pool in summer, so ask us first if you want a true ice bath temperature.
How much does a heat pump for a small pool cost in Australia?
A quality inverter heat pump for a small pool costs about $2,650 to $3,700 in Australia, before installation, as of November 2026. Our range starts at $2,645 for the Fairland 7.5kW. Fairland prices vary by state, so check the product page for yours.
Still not sure which one fits your pool?
Send us your pool size, your postcode, whether it has a cover and the temperature you want, and we will tell you which unit fits. Get a pool heating quote in minutes, or contact us here.
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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 with us or your pool professional before you buy.