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Calorex Heat Pumps in the UK: Reviews, Prices & Models 2025
- The average cost of a Calorex heat pump is between £4,000 to £12,000 per unit, depending on the model and installation complexity.
- Calorex heat pumps are praised by users for their efficiency and ease of use, while some note performance drops in very cold weather.
- Calorex sells air source heat pumps for pools, with outputs ranging from 5 kW to 30 kW.
Calorex is a leading brand in the UK of energy-efficient air source heat pumps. They specialise in swimming pool heating solutions and are known for robust designs tailored to British weather conditions. Their models like the I-PAC, Pro-PAC, and V-PAC deliver industry-leading COP ratings (up to 10.3) along with quiet operation and smart controls. This makes them a top choice for extending your swimming season effectively.
This comprehensive guide will delve into Calorex heat pump reviews, pricing, and model options to help you determine if they are the ideal choice for your swimming pool.
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Calorex heat pump models
Calorex offers a range of air source heat pumps designed for UK swimming pools, categorised by technology type, capacity, and efficiency. Below we have a breakdown of those models:
| Model | Type | Heat Output | Efficiency (COP) |
|---|---|---|---|
| Calorex I-PAC | Air source | 5 – 20 kW | 10.3 |
| Calorex Pro-PAC | Air source | 8 – 30 kW | 5.5 |
| Calorex V-PAC | Air source | 5 – 12 kW | 9.9 |
As shown in the table, all three models (I-PAC, Pro-PAC, and V-PAC) operate as air source heat pumps but differ significantly in performance:
- I-PAC: With a 5 - 20kW heat output and industry-leading COP of 10.3, this model delivers maximum energy efficiency for extended swimming seasons. It is an ideal choice for reducing long-term running costs.
- Pro-PAC: Delivers the highest heat capacity of 8 - 30kW with a COP of 5.5. This on/off compressor model prioritises raw heating power over efficiency, making it better suited for seasonal or occasional use.
- V-PAC: This model offers a compact design with 5 - 12kW output and a COP of 9.9. It is an inverter-driven unit that can automatically adjust how hard it works and strikes a balance between space-saving installation and energy savings which is perfect for medium pools where efficiency and footprint matter.
Each model caters to distinct needs: the I-PAC for year-round efficiency, the Pro-PAC for high-output seasonal heating, and the V-PAC for compact, cost-effective performance.
Calorex did offer air to water and ground source heat pumps for domestic use, until 2016 when it was acquired by the Dantherm Group. These heat pumps were discontinued or integrated into Dantherm's broader range of heating solutions.
Calorex heat pump prices
Calorex offers three main air source heat pump models for swimming pools, with prices varying significantly based on capacity, efficiency, and technological features. Below is a breakdown of unit costs, installation expenses, and maintenance considerations:
| Model | Estimated Price (Unit Only) | Estimated Installation Cost | Maintenance Cost (Per Year) |
|---|---|---|---|
| Calorex I-PAC | £4,000 - £8,000 | £1,200 - £3,500 | £200 - £400 |
| Calorex Pro-PAC | £3,000 - £7,000 | £1,000 - £3,000 | £250 - £500 |
| Calorex V-PAC | £6,000 - £12,000 | £1,500 - £4,000 | £200 - £400 |
| The costs are estimates. | |||
The key factors influencing the air source heat pump cost of your swimming pool are:
- Inverter technology: I-PAC and V-PAC models feature variable-speed compressors, increasing efficiency and COP up to 10.3. This will add £1,000 - £3,000 to base prices compared to non-inverter models.
- Heat output: Prices increase with the output capacity of the heat pump. You have the option from 5kW for small pools to 30kW for commercial-sized installations.
- Specialised components: Pro-PAC models use titanium heat exchangers for durability, while I-PAC includes Wi-Fi controls for smart management.
The maintenance cost covers routine services such as checking refrigerant levels, cleaning out filters, inspecting electrical components, and other small repairs that might be required. Regular maintenance helps keep your heat pump’s performance high and extends its lifespan.
The higher-end V-PAC requires slightly more expensive heat pump installation due to its larger footprint, while Pro-PAC models are often chosen for smaller pools where lower upfront costs are more important than high efficiency.
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Calorex air source heat pump pros and cons
As with every brand, Calorex has its advantages and disadvantages compared to other heat pump manufacturers in the UK market. Take a look at our compiled list of pros and cons:
- Exceptional efficiency: Delivers industry-leading COP ratings up to 10.3. This significantly reduces the energy bills for pool heating.
- Low noise: Noise levels are on par with other heat pumps (45 - 55dB at 1m). Models like V-PAC series operate as low as 40.8dB which makes it an ideal choice for noise-sensitive areas.
- Heating for swimming pools: Calorex heat pumps are among the best air source heat pumps in the UK because they use inverter technology. They are a great option for precise pool temperature control and less energy consumption.
- Smart controls: Some models like the Wi-Fi-enabled I-PAC series allow you remote temperature adjustments, making it easy to control.
- Easy installation & integration: Calorex heat pumps come as monobloc units with easy controls. They have a user-friendly design that installers find easy to set up.
- Warranty concerns: Calorex offers an industry-standard 2-year warranty on its heat pumps. This is basic compared to competitors as many rival brands now offer 5 to 7 years.
- Availability and support: Users have reported some difficulty in sourcing spare parts after the discontinuation of domestic Calorex heat pump models. Some customers also report difficulty finding local engineers experienced with Calorex units.
- Not eligible for grants: To qualify for the heat pump grant in the UK, your heat pump must primarily provide space heating and domestic hot water for the property. While heating a swimming pool can be an additional function, it cannot be the main purpose of the system.
- Cold weather limitations: The output and efficiency of the heat pump drops below 0°C. This would require you to add supplementary heating for year-round use. Hence, it is not recommended to get this in areas with harsh cold weather.
Calorex heat pump reviews
Customer feedback consistently shows Calorex’s energy efficiency and reliability for UK pool heating. Users frequently commend the impressive COP ratings of up to 10.3, which significantly reduce electricity consumption. Many users have reported saving up to 60% on their energy bills, compared to traditional gas heaters.
The straightforward installation process and user-friendly controls like the Wi-Fi-enabled I-PAC models that allow remote temperature adjustments have been a major hit with the users. They have also praised the heat pumps’ stable performance in typical UK weather conditions. These heat pumps are compatible with both pools and radiator systems, with units achieving water temperatures up to 65°C.
However, there are some challenges noted by the users. Efficiency of the system reduces when the temperature hits below 0°C. This means it would often require extra heating for year-round use.
Although Danthem still supports existing units, a few users have mentioned difficulties sourcing spare parts since Calorex discontinued some of their domestic models. But some retailers in the Uk selling Calorex products (especially pool heaters) are maintaining a strong Trustpilot rating for ongoing product support and service.
It is difficult to find an exact review score for Calorex due to its niche focus but their feedback for pool heating remains overwhelmingly positive. Competitors like Daikin (4.2/5) and Mitsubishi (4.3/5) score higher for general heating applications, but Calorex maintains a strong reputation for specialised pool heating solutions.
Calorex heat pumps per pool size
Your swimming pool’s size will determine which Calorex heat pump model would work best for you. Here is what we recommend:
| Pool Size (m³) | Recommended Calorex Model | Why It's Suitable |
|---|---|---|
| Small (up to 20m³) | Pro-Pac 8 | Ideal for small pools. Offers efficient heating with a 7.2kW output and a titanium heat exchanger |
| Medium (20–40m³) | V-PAC 12 | Provides 14.11kW capacity |
| Medium-large (40–60m³) | I-PAC 12 | Offers efficient inverter technology with a 15kW heating capacity |
| Large (60–80m³) | V-PAC 22 | Delivers 24.4kW capacity |
| Extra Large (over 80m³) | I-PAC+ 22 | Provides a high capacity of 27.5kW |
The I-PAC series combines inverter-driven efficiency (COP up to 10.3), smart Wi-Fi controls, and variable-speed operation. This is ideal for extending your swimming season while keeping your energy bills lower.
For durability-focused heating, the Pro-PAC series is a great option. It has titanium heat exchangers and robust on/off compressors, making it a reliable choice for smaller pools or year-round use with its upgraded "Y" models.
The V-PAC series offers compact, whisper-quiet performance as low as 40.8 dB. It is also equipped with multi-function heating/cooling making it the perfect choice for medium-to-large pools where space and efficiency matter equally.
How do Calorex air source heat pumps compare to other brands?
Let’s check how Calorex heat pumps compare to other heat pump manufacturers in the UK market. Here is the detailed breakdown of how they compare to Vaillant heat pumps, Daikin heat pumps, Panasonic heat pumps, Samsung heat pump, Mitsubishi heat pumps and LG heat pumps:
| Brand | Types of Heat Pump | Output Sizes (kW) | Price Range (Incl. Installation) | Warranty | USP |
|---|---|---|---|---|---|
| Calorex | Air to water | 5 - 30kW | £4,000 - £12,000 | 2 years | Energy-efficient air source heat pumps, specialising in swimming pool heating solutions |
| Vaillant | Air to air, air to water, and ground source | 3.5 - 19kW | £4,000 - £15,000 | 2 - 7 years | Quiet operation and compact design |
| Daikin | Air to air and air to water | 2 - 16kW | £1,500 - £9,000 | 5 - 7 years | Advanced air purification and versatility |
| Panasonic | Air to air and air to water | 2 - 16kW | £3,000 - £15,000 | 3 - 7 years | Eco-friendly refrigerants and durability |
| Samsung | Air to air and air to water | 9 - 16kW | £3,400 - £7,400 | 2 - 7 years | Affordable pricing with modern designs |
| Mitsubishi | Air to air and air to water | 4 - 16kW | £6,000 - £12,000 | 3 - 5 years | Reliable in extreme climates |
| LG | Air to air and air to water | 9 - 16kW | £6,000 - £12,000 | 5 - 7 years | Stylish designs and smart controls |
Should you get a Calorex heat pump?
Calorex heat pumps stand out as a sustainable, cost-effective solution tailored to UK pool owners seeking year-round comfort without excessive energy bills. Their inverter-driven models like the I-PAC deliver industry-leading efficiency and COP up to 10.3, while durable titanium heat exchangers in Pro-PAC models ensure longevity even in demanding conditions.
Though they are less suited to sub-zero temperatures, their smart Wi-Fi controls, quiet operation, and compatibility with pools of all sizes make them one of the best heat pumps for extending swimming seasons responsibly.
If you’re looking for the best deals on heat pumps and their installation, we recommend checking out multiple installers before you make your decision. A good installer can provide A-grade service and swift installation at reasonable prices.
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