Calorex I-PAC+ Inverter 15kw-36kw All Year Use Heat Pumps



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Calorex I-PAC+ Domestic Pool Water Heat Pump

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Inverter technology allows for efficient control of the pool temperature, and the I-PAC only uses what energy is needed when it is required. High efficiency with modulating step-less inverter compressor giving an average COP of 10.3.

Calorex I-PAC+ Inverter Heat Pumps

1. Description

HeatPumps4Pools are the leading specialist supplier of swimming pool heat pumps.

We are proud to announce the launch of the new heat pump range from Calorex.

New for 2019, the Calorex I-PAC+ Inverter range of pool heat pumps really do offer the best in terms of efficiency, performance, reliability and low noise operation.

Inverter technology allows for efficient control of the pool temperature, and the I-PAC+ only uses what energy is needed when it is requires.

High efficiency with modulating step-less inverter compressor giving and average COP of 10.3

In addition the inverter technology has a reduced electrical startup requirement, making them ideal for properties with a sensitive or limited electrical supply.

These units will provide pool water heating for all year use.

2. Features

  • Average COP 9.7 = +2 x more efficient than on/off heat pumps
  • Eco-friendly refrigerant R32 = 675 GWP, (Global Warming Potential)
  • Inverter heat pump
  • Increased range of power ratings from 15 to 36kW
  • 9-11 dB(A) sound reduction than on/off heat pump, with ‘Whisper Mode’
  • 27% to 46% reduction in size of dimensional footprint
  • Increased operating range
  • Multi function operation functions can be set to heating, heat/cool and cooling
  • Soft start-up
  • Aluminum alloy
  • Operates down to -10c air temperatures
  • Built-in Wi-Fi module
  • Designed by Calorex in the UK

3. Wi-Fi Control

This range of heat pumps come complete with a built-in Wi-Fi module, so that you can easily operate your heat pump from your phone app.

The app is called PoolTherm for iphone and Calorex i-pac for Android phones

4. Applications

  • Outdoor pools
  • Private pools
  • Spa pools
  • Above ground pools
  • Wellness centres
  • Therapy pools

5. What size heat pump do I require for my pool?

The sizing guide for a covered pool is:-

Recommended Max Pool Volume
 Absolute Max Pool Volume
I-PAC+ IPT 12ALY15kw45m360m3
I-PAC+ IPT 16ALY21kw
I-PAC+ IPT 22ALY27.5kw
I-PAC+ IPT 22BLY27.5kw (3 Phase)80m3105m3
I-PAC+ IPT28BLY36kw (3 Phase)

6. Specifications

Please see Specifications tab at the top of the page

7. Options

  • Remote LED control kit

8.Optional Extras:

Heavy Duty Mounting Feet Thermotec-Inverter-Horizontal-rear.jpgThese heat pumps come with rubber  mounting feet (see photo above).

Alternatively you can purchase these heavy duty Mounting Feet.

These raise the unit off the ground by approximately 100mm, and also help to reduce vibration.

Please see our Mounting Feet and Slabs section for more information.

Bypass Kit Please see our Bypass Kits section section for more information.



Winter Cover The unit comes with a lightweight winter cover, however we offer a heavy duty cover which will give you added and extended protection against the winter weather

Please see our Winter Cover section section for more information.


9. Installation

Installation is straightforward. We can provide advice on installing your heat pump. We can also offer an installation service if required.

We recommend that a bypass is installed to allow the heat pump to be drained in winter if not in use. We sell bypass kits if required.

Please see our Installation Tips pages for information on how to install your heat pump. Our Photo Gallery also has photograph examples of pool heat pump installations and please also see the FAQ pages for more information

10. Availability

The range of Calorex I-PAC+ Inverter pool heat pumps are now in stock in the UK and can be shipped to any UK address on a 1 – 3 day delivery service.

11. Delivery

The price includes FREE UK delivery.

We can ship the Calorex I-PAC+ Inverter heat pumps to any country. Please contact us for a shipping quote.

12. Warranty

The Calorex I-PAC+ Inverter heat pumps come with a  5-year parts and labour on-site warranty

We recommend that you retain the pallet and packaging that the heat pump was delivered with in case you need to return the unit to us for repairs under the warranty. 

The warranty will not apply where the heat pump has been installed incorrectly, or has been damaged by freezing

13. Technical Support

We are happy to provide technical support for all Calorex swimming pool heat pumps that we supply.

We hold spare parts to support all Calorex I-PAC+ Inverter heat pumps both during and after the warranty period

14. Product Literature

Please click the links below to download pdf brochures for these products

Calorex I-PAC+ Brochure

Please also see the Literature tab at the top of the page for the Brochure and User Manual downloads.

15. Videos

16. Assistance?

If you need any assistance or advice as to which model would be best for your pool, please feel free to Contact Us

for more information, also see our FAQs page

All items sold in accordance with our terms and conditions

for all enquiries, please contact us at

Calorex I-PAC Heat Pumps Specifications

Please click the links below to download pdf brochures for these products

Calorex I-PAC+ Brochure


We accept all major credit and debit cards, Bank Transfer (BACS) and Paypal

All major credit cards accepted

Paypal Credit

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For details of PayPal Credit please click here: PayPal Credit


The prices shown include FREE UK delivery for orders over £50 or £6.50 for orders under £50

We can ship to any country. Please contact us for a shipping quote.

The lead time on most items is normally on a 1-2 day delivery,  subject to availability. Please call to check availability.

Additional information


15kw, 21kw, 27.5kw, 36kw


Single Phase, 3 Phase