CO2 air source heat pumps


Explore Klima Therm’s CO2 (carbon dioxide) heat pump range. Highly effective, energy efficient and sustainable, CO2 heat pumps deliver reliable solutions and long-term savings for commercial and industrial settings. 

CO2 Heat Pumps available from Klima-Therm


  • Environmentally friendly: CO2 (R744) is a natural refrigerant with zero ozone depletion potential and minimal global warming impact. 
  • Outstanding performance: our systems are capable of producing very high temperature for domestic hot water (DHW), sanitary water or for industrial processes. 
  • Versatile application: from air-to-water to water-to-water configurations, our CO2 heat pumps adapt seamlessly to any water system for ease of installation.


Among the many benefits of using CO2 as a refrigerant are its high thermodynamic performance and a virtually zero impact on the environment. 

Choosing a CO2 based system solves any concern relating to international restrictions and regulations applicable to the use of high GWP (global warming impact) refrigerants and helps to preserve a healthy environment by avoiding harmful emissions to the atmosphere.

High thermodynamic performance CO2 heat pumps chart

High thermodynamic performance on our CO2 heat pumps.


CO2 heat pumps set new standards in efficiency and sustainability:

  • High coefficient of performance (CoP)
  • Reduced energy consumption
  • Lower energy costs 
  • Minimal environmental impact
  • Compliance with international regulations


CO2 heat pumps supplied by Klima-Therm can be used in any commercial or industrial application that requires the sustainable, cost-efficient production of hot water, including:

  • Hospitals
  • Hotels
  • Factories
  • Large housing complexes


Explore Klima Therm’s comprehensive range of CO2 heat pumps tailored to suit your specific requirements.

Enerblue range:

  • Exceptionally wide heating capacity from 14.5 to 133.2kW
  • Delivers water temperatures up to 90°C even under extreme conditions (external temperatures -20°C)
  • Ideal for a wide variety of applications
  • Enerblue CO2 HP90 model allows the production of high temperature DHW with a coefficient of performance (CoP) of 3.2, leading to significant utility bill savings
  • Simultaneous production of hot and chilled water boosts energy efficiency

Find out more about Enerblue CO2 heat pumps

Engie range:

  • Available from 150 to 1,500kW
  • Water-to-water only
  • More suited to industrial applications
  • Engie high temperature heat pumps provide hot water temperatures of up to 110°C. 
  • Low heating return temperatures in the so-called ‘transcritical’ CO2 recycle process result in lower energy loss than conventional heat pumps with a subcritical cycle.
  • Heating processes such as drinking water preparation and process water heating allow low return temperatures and can therefore be implemented with higher-performance CO2 heat pumps.

Find out more about Engie CO2 heat pumps

Find your perfect heat pump solution 

Ready to revolutionise your heating system? Contact with our experts today to find the ideal heat pump solution for your needs.


How do CO2 heat pumps work?

CO2 heat pumps utilise carbon dioxide (CO2) as a refrigerant to extract heat from the surrounding environment, such as air or water. This heat is then transferred into a heating system, providing hot water for various applications.

Are CO2 heat pumps environmentally friendly?

Yes, CO2 heat pumps are considered environmentally friendly because they use CO2 as opposed to fluorinated gases (F-gases), such as hydrofluorocarbons (HFCs) or hydrochlorofluorocarbons (HCFCs). These gases have been traditionally used in refrigeration and air conditioning systems but are being phased out due to their high global warming potential (GWP). CO2 is a natural refrigerant with a low GWP and zero ozone depletion potential (ODP), which helps to reduce greenhouse gas emissions.

What are the advantages of CO2 heat pumps compared to traditional systems?

CO2 heat pumps offer several advantages, including higher energy efficiency, lower operating costs, reduced carbon emissions, and compliance with environmental regulations. They also provide reliable heating performance even in extreme weather conditions.

Are CO2 heat pumps suitable for all types of buildings?

CO2 heat pumps are versatile and can be used in various commercial, industrial, and residential buildings. However, the suitability depends on factors such as building size, heating requirements, and environmental conditions.

If you would like to discuss your requirements to see whether a CO2 heat pump would meet your needs, contact our team of experts today.

What maintenance is required for CO2 heat pumps?

As with all HVAC systems, regular maintenance is essential to ensure the optimal performance and longevity of CO2 heat pumps. This includes cleaning filters, inspecting components, checking refrigerant levels, and scheduling professional servicing as needed.

Are CO2 heat pumps cost-effective?

While the initial investment for CO2 heat pumps may be higher than traditional systems, they offer long-term cost savings through lower energy consumption and reduced operating expenses. Additionally, incentives and/or grants may be available to offset installation costs.

Can CO2 heat pumps provide both heating and cooling?

Yes, some CO2 heat pump systems are designed to provide both heating and cooling capabilities. These systems can efficiently heat water for space heating or domestic hot water and provide cooling for air conditioning or process cooling.

Get in touch to find out more. 

How do CO2 heat pumps perform in cold climates?

CO2 heat pumps are known for their exceptional performance in cold climates. CO2 heat pumps can maintain high efficiency and heating capacity even in sub-zero conditions.