Calorex Pro Pac 8-22kw X Range – Extended Season Heat Pumps

Discontinued Alternative

Calorex I-PAC Inverter 8kw-22kw Extended Season Heat Pumps


Calorex Pro-Pac Extended Season Heat Pumps

Note: The Calorex On/Off range have now been replaced by the Calorex Inverter Range of heat pumps



calorex propac - new

1. Description

Calorex Swimming Pool Heat Pumps from HeatPumps4Pools are made in the UK and have a reputation for reliability, and an excellent backup service.

The Calorex Pro-Pac Summer Season range of heat pumps will work down to +5c and designed to heat pools from May to September or April – October

The Calorex Pro-Pac Extended Season range swimming pool heat pumps supplied by HeatPumps4Pools.

2. Features

  • Plastisol coated cabinet and ABS top cover
  • Intelligent electronic defrost
  • Can be installed outside or in a plant room
  • Choice of in-built thermostat positions
  • High efficiency full flow Titanium condenser
  • Leading brand rotary or scroll compressors
  • Quiet, efficient owlet axial fans
  • Water flow switch
  • Pool pump synchronisation control
  • Soft start options
  • Pro-Pac X models operate in air temperatures about +5°C. These models are designed for seasonal use
  • Available in single or 3 phase units
  • Indoor or outdoor pools
  • Private Pools
  • Spa Pools
  • Hotel pools
  • Wellness Centre
  • Therapy Pools

To help with electrical demands, ‘soft- starts’ can be fitted (if necessary) to any of the units as an optional extra. This reduces the initial electrical current surge associated with compressors. Advice from an electrician may be needed prior to installation.

Pro-Pac Y models are fitted with reverse cycle defrost and will operate in air temperatures as low as -15°C, therefore they are suitable for all season use and indoor swimming pools. So if you are looking for an all year model please you need to look the Single Phase – Y Range Models

3. Quality

Calorex units are built to last and have been supplied to the swimming pool industry for decades. Thousands of Calorex units have been successfully operating in some thirty countries. The choice of materials for the components is aimed at a long reliable life.

The cabinets are steel, first galvanised and then coated to provide resilient protection against external elements. Pool water
heat exchangers are of high quality to ensure maximum resistance to pool chemical corrosion.

All models now include a titanium heat exchanger with a five year warranty, plus digital controls.

Each unit is thoroughly tested and inspected and must meet a precise performance standard before leaving the factory. The
Calorex factory and products are approved to several internationally accepted standards of quality and safety.

All Calorex equipment is fully guaranteed and dispatched complete with comprehensive instructions.

calorex propac new rear image

4. Controller

calorex propac new display

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

For an outdoor pool in the UK that is kept covered, use the following Calorex guide:-

Many factors can affect the sizing of a heat pump for your pool. You are therefore strongly advised to contact us to get an accurate sizing recommendation for your particular pool.

6. Specifications

Please see Specifications tab at the top of the page

7. Installation

The Calorex Swimming Pool Heat Pump is designed intelligently and exceptionally compact for ease of installation. One of the simple but handy design additions on the Calorex Heat Pump is the integrated flow switch which will sense the water flow and automatically start the heater when the pool pump starts and stop it when the pump shuts off. Simple, but very handy.

The Pro-Pac range can be installed outdoors or inside a plat room.

Prices include delivery to most UK postcodes. (excludes Scotland and some UK postcodes).

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

Installation of Heat Perfector

Please see our Installation pages for photographs of examples of pool heat pump installations and also the FAQ pages for more information

8. Availability

The Calorex PPT X Range of 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.

Please note we have now been advised there is limited amount of stock of this range as it is “end of life”, please call us to go through alternative models or check stock.

9. Delivery

The price includes FREE UK delivery.

We can ship the Calorex heat pumps to any country. Please contact us for a shipping quote.

10. Warranty

All Calorex Pro-Pac heat pumps come with the following warranty:-

  • 3-years in site parts and labour warranty on all components in the UK
  • 3-years parts only warranty on all components in Europe
  • 10 year anti-corrosion warranty on heat pump casing
  • Warranty subject to the unit being installed in accordance with manufacturer’s instructions.

11. Technical Support

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

We hold spare parts to support all Calorex heat pumps both during and after the warranty period

12. Product Literature

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

13. Assistance?

If you need any assistance or advice as to which model would be best for your pool, please email 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

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

Duratech BrochureCalorex Pro-Pac 8-22kw Leaflet


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

Weight70 kg

8kw, 12kw, 16kw, 22kw


Single Phase, 3 Phase