Poolex Nano Ultra Compact Heat Pump with Wi-Fi for Above-Ground Pools

Poolex Nano Ultra Compact Pool Heat Pump

Compact, quiet and efficient above ground pool heating for small garden pools

Please note, this Poolex Nano Ultra Compact model is currently out of stock. We recommend viewing the Poolex Nano FI Full Inverter Heat Pump instead, which is currently in stock and is the newer full inverter version for small above ground pools. It offers improved efficiency, quieter running and more precise temperature control, making it the best current alternative for customers looking to heat a Bestway, Intex, framed, wooden or compact garden swimming pool.

The Poolex Nano Ultra Compact Pool Heat Pump is a fantastic choice for heating small above ground swimming pools, especially where space, simplicity and running costs matter. Designed for domestic garden pools, the Poolex Nano is ideal for above ground pools, framed pools, wooden pools, seasonal pools, small garden swimming pools and compact family pools that need reliable heating without a complicated installation.

The Poolex Nano is suitable for many Bestway, Intex, framed, tubular, wooden and other above ground swimming pools, provided the filtration system can maintain the required water flow and can be connected using suitable 32mm or 38mm hoses.

Above ground pools are quick to install and great fun in the summer, but they can lose heat quickly, especially in the UK. Cooler nights, cloudy days, wind exposure and poor insulation can all make the water feel cold, even when the weather has been warm.

The Poolex Nano helps solve this problem by using efficient air source heat pump technology to draw warmth from the surrounding air and transfer it into the pool water. This gives a much more efficient form of pool heating than a basic electric heater, helping you enjoy warmer, more comfortable water while keeping energy use sensible.

The Poolex Nano is designed to be easy to live with. It comes with a mains cable and pre fitted RCD safety plug, allowing it to plug into a suitable RCD protected outdoor socket.

The supplied hose tails are suitable for common 32 mm and 38 mm pool hoses, making it a practical choice for many above ground pool setups. The unit is compact enough to sit neatly beside a pool, on a patio, near decking or in a small garden space, with dimensions of only 440 mm x 400 mm x 390 mm.

Despite its small size, the Nano offers impressive performance. The Nano 3.5 provides up to 3.25 kW of heating output, while the Nano 5.5 provides up to 5.0 kW. With a COP of up to 5.5 on the Nano 3.5 and up to 5.4 on the Nano 5.5 in warm test conditions, the heat pump can produce several times more heat output than the electricity it consumes.

In simple terms, this means you can get up to around five times the heat output for every pound spent on electricity, depending on weather conditions, pool size and setup.

Perfect for small above ground pools

The Poolex Nano has been designed specifically with small above ground pools in mind. Many larger swimming pool heat pumps are too big, too complex or simply unnecessary for small seasonal pools. The Nano gives you proper heat pump technology in a compact and user friendly unit that is much better suited to domestic garden pool use.

It is also very quiet, operating at under 30 dB at 10 metres. This makes it ideal for gardens, patios and family spaces where you want to enjoy the pool without the heater becoming a noisy distraction. The compact footprint also makes it easier to position in tight spaces where a larger pool heat pump would look bulky or awkward.

Heating, cooling and automatic control

The Poolex Nano is not just a heater. It includes heating, cooling and automatic operating modes, giving you better control throughout the swimming season.

Heating mode helps raise and maintain your chosen pool temperature.

Cooling mode can reduce excessive water temperature during very hot weather.

Automatic mode allows the unit to regulate the temperature more intelligently.

The adjustable temperature range gives good flexibility for different users, pool types and weather conditions. This is especially useful in the UK, where the weather can change quickly and pool temperatures can vary from day to day.

Smart WiFi app control

Built in 2.4GHz WiFi allows the Poolex Nano to be controlled from your phone using the Poolex app. The Smart Life app can also be used. Once connected, you can adjust the target temperature, change operating modes and monitor the heater remotely.

This is a useful feature for above ground pool owners because you can check and adjust the heater without going outside. You can start warming the pool before use, make changes during the day and keep an eye on performance more easily.

Durable titanium heat exchanger

The Poolex Nano uses a Twisted Tech titanium heat exchanger, which is designed for use with swimming pool water. Titanium is highly resistant to corrosion, making the heat pump suitable for correctly maintained chlorine and salt treated pools.

This is an important feature for long term reliability, as pool water can be harsh on cheaper materials. The Nano also uses R32 refrigerant and a GMCC rotary compressor for dependable performance in a compact outdoor unit.

Automatic defrost for cooler weather

Automatic defrost helps prevent ice build up on the rear of the unit during colder conditions. This allows the heat pump to operate across a wider seasonal window, helping you start using the pool earlier in spring and continue later into autumn when conditions allow.

As with all air source pool heat pumps, performance will depend on the air temperature. Heat pumps work best when the surrounding air is warm because there is more heat energy available to transfer into the pool. In cooler weather, the unit will still work, but the COP will reduce and heating times will increase.

Does the Poolex Nano need a bypass kit?

A bypass kit is not essential for every Poolex Nano installation. Where your filtration system provides a suitable water flow of approximately 1.4m³ per hour, the heat pump can normally be connected directly into the return line.

A bypass kit is recommended where the filtration pump produces considerably more flow than the heat pump requires. It allows the water passing through the heater to be adjusted while also making it easier to isolate the Nano for maintenance and winterisation.

Depending on your existing pool setup, you may also require additional 38mm swimming pool hose and stainless steel hose clips.

Pool covers and insulation

If you are heating an above ground pool, a pool cover is strongly recommended. A large amount of swimming pool heat is lost through surface evaporation, particularly overnight. Using a solar cover or bubble cover when the pool is not in use helps retain heat, reduce running costs and make the heat pump more effective.

Above ground pools are usually less insulated than in ground pools, so heat can also be lost through the sides and base. Adding insulation around the pool where practical can help retain valuable heat and may improve seasonal performance.

Sizing advice for UK pools

The Poolex Nano 3.5 is suitable for small pools up to 20 m³ in favourable conditions.

The Poolex Nano 5.5 is suitable for small pools up to 30 m³ in favourable conditions.

Pool sizing can vary depending on climate, wind exposure, desired water temperature, cover use and how long you want to use the pool each year. Manufacturer recommended pool sizes are often based on warmer climates, so UK customers should size carefully. If you want faster heating, a longer season or warmer water in cooler weather, it is often better to choose the larger model.

Positioning the heat pump

The Poolex Nano should always be installed outside where it has access to free flowing air. The outdoor casing protects the unit from normal weather conditions, but it should not be placed in an enclosed shed, box or tight space where airflow is restricted.

For above ground pools, the heat pump can be positioned at ground level beside the pool. There is normally no need to raise it above the waterline. Keep the unit level, stable and clear around the fan area so it can move air properly.

Prefer quieter Full Inverter pool heating?

The standard Poolex Nano is a compact and affordable On/Off heat pump that is ideal for straightforward seasonal pool heating. For quieter temperature maintenance, variable-speed compressor control and improved energy efficiency, view the Poolex Nano FI Compact Full Inverter Heat Pump for Above-Ground Pools.

The Nano FI automatically adjusts its compressor and fan speed according to the pool’s heating requirements, rather than repeatedly operating at full output. It is available in 3kW and 5kW models for small above-ground pools up to 20m³ or 30m³ in favourable conditions.

Poolex Nano or Poolex Nano FI?

Both models provide compact and convenient heating for small swimming pools, but they use different compressor control systems.

Feature	Poolex Nano	Poolex Nano FI
Heating technology	On/Off	Full Inverter
Compressor operation	Runs at a fixed output	Adjusts output continuously
Temperature maintenance	Switches on and off as required	Reduces output near the target temperature
WiFi control	Included	Included
Heating and cooling	Included	Included
Best suited to	Affordable seasonal pool heating	Quieter and more efficient temperature maintenance

The standard Poolex Nano is the more affordable choice for straightforward seasonal heating. Customers wanting variable speed output, smoother temperature control and quieter maintenance operation may prefer the Poolex Nano FI Compact Full Inverter Heat Pump.

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Key Benefits

• Ultra compact pool heat pump for small spaces
• Fantastic above ground pool heater for UK gardens
• Suitable for small framed pools, wooden pools and seasonal garden pools
• Plug and Play style setup with standard pool hose compatibility
• Supplied with 32 mm and 38 mm hose connectors
• Pre fitted RCD safety plug for suitable outdoor sockets
• Built in WiFi control through the Poolex app
• Heating, cooling and automatic operating modes
• Quiet operation under 30 dB at 10 metres
• Energy efficient performance with COP up to 5.5
• Titanium heat exchanger suitable for chlorine and salt treated pools
• Automatic defrost for cooler seasonal use
• Compact 440 mm x 400 mm x 390 mm footprint
• Bypass kit recommended for correct flow control
• Optional 38 mm vac hose and hose clips available

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Reasons to Buy

The Poolex Nano is one of the easiest and most practical ways to heat a small above ground pool. It gives you proper heat pump performance without the size, cost or complexity of larger pool heating systems.

It is ideal for families who want warmer pool water, more comfortable swimming and a longer usable season. The compact size makes it easy to fit into smaller gardens, while the quiet operation helps keep the outdoor space peaceful.

It is also a sensible option for customers who want better efficiency than a basic electric pool heater. With WiFi control, heating and cooling modes, automatic defrost and a durable titanium heat exchanger, the Poolex Nano offers a strong balance of performance, convenience and value.

What is Included?

• Poolex Nano Pool Heat Pump
• Pre fitted RCD safety plug
• 32 mm and 38 mm hose connectors
• Instruction manual

Recommended Extras

• Above ground pool heat pump bypass kit
• 38 mm swimming pool vac hose
• Stainless steel hose clips
• Pool cover or solar bubble cover
• Additional hose fittings if required for your pool setup

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Technical information

• Type: Ultra compact swimming pool heat pump
• Models: Nano 3.5 and Nano 5.5
• Recommended pool volume: Up to 20m³ and up to 30m³ in favourable conditions
• Maximum heating capacity at A26/W26: 3.25kW and 5.0kW
• Power input at A26/W26: 0.59kW and 0.93kW
• COP at A26/W26: 5.5 and 5.4
• Maximum heating capacity at A15/W26: 2.19kW and 3.36kW
• Power input at A15/W26: 0.55kW and 0.81kW
• COP at A15/W26: 3.95 and 4.16
• Maximum power input: 1.25kW and 1.75kW
• Voltage: 230V
• Refrigerant: R32
• Noise level at 10m: Under 30dB
• Fan direction: Horizontal
• Water connections: 32mm
• Hose compatibility: 32mm and 38mm pool hose
• Nominal flow: 1.4m³/h
• Dimensions: 440mm x 400mm x 390mm
• Weight: 25kg and 32kg
• Wi-Fi connectivity: 2.4GHz only
• App control: Poolex app or Smart Life app
• Heat exchanger: Titanium
• Compressor: GMCC rotary compressor
• Operating modes: Heating, cooling and automatic
• Heating temperature range: 10°C to 40°C
• Ambient operating range: minus 7°C to 43°C
• Noise level at one metre: 48dB(A)
• Noise level at ten metres: Below 30dB(A)

Available model options

For easier comparison, the main model options are shown below with their key output and electrical input figures. Heat pump performance always depends on the test condition shown, so compare the same A/W condition when choosing between models.

• Nano 3.5 – SKU 118274-118275
  Output A26/W26: 3.25kW
  Input A26/W26: 0.59kW
  COP A26/W26: 5.5
• Nano 5.5 – SKU 118274-118276
  Output A26/W26: 5.0kW
  Input A26/W26: 0.93kW
  COP A26/W26: 5.4

Warranty Information

The Poolex Nano range includes comprehensive manufacturer warranty coverage:

• Heat Pump: 2 years
• Compressor: 5 years
• Titanium Coil: 15 years against chemical corrosion

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Important Notes

A bypass kit is strongly recommended to optimise the flow through the heat pump.

The heater may not operate correctly if the flow rate is too high or outside the preferred range.

Additional 38 mm vac hose and hose clips may be needed depending on your pool setup.

The heat pump should be installed outside with good airflow around the unit.

For above ground pools, the heater can usually sit at ground level beside the pool.

A pool cover is strongly recommended to reduce heat loss and improve efficiency.

Above ground pools may benefit from additional side and base insulation.

Real world performance depends on air temperature, pool size, desired water temperature, wind exposure, cover use and installation setup.

WiFi requires a 2.4GHz network connection.

Pool water should be correctly balanced to protect the heater and other equipment.