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Clade’s CO2 heat pumps reduce carbon emissions while helping you maintain temperature control in your building. Browse our range of sustainable CO2 heat pumps available for various sectors, including agriculture, commercial, data centres, residential, and industrial and manufacturing.



Low noise & easy to install – the 50KW Acer uses CO2 as its refrigerant and delivers high temperatures, 70 to 80 degrees, as well as the high performance associated with CO2.

It’s affordable, small and can be delivered quickly.



With our Acer Plant-Room you get everything you need to connect our 50kW Acer CO2 heat pump to your heat emitters and valves. We can also supply pre-selected heat emitters as radiators, unit heaters or a mix of both.



The Spruce is a combine air handling unit and CO2 heat pump with reciprocating compressors, using inverter technology, and a direct expansion CO2 heat transfer coil. Clade AHU / HP Combo units can produce an air off of 30℃ with an airflow of 8m3.



The Oak is our mid-scale CO2 heat pump design. It is suitable for continuous operation and at higher heating capacities for large buildings or processes for example; swimming pools, food production, district heating and factories.
Designed and built to be fully serviceable.



The Beech is our largest CO2 heat pump, bespoke designed and manufactured for each project. Up to 1.4MW in a single unit and encompassing ground, air, water source as well as heat reclaim. Installed as separate evaporators and compressor stations with either glycol or refrigerant connections.



Sitting between our flagship Acer CO2 and Oak CO2 heat pumps, the Maple is cost effective and has a smaller footprint. Whilst it can’t reach the ultimate efficiency or higher temperatures of the Oak, the Maple delivers superior performance up to 80C flow temperature which is more than enough for most buildings.

Whatever Your Heat Pump Issues, We Can Solve Them

Our Acer CO2 Heat Pumps are available to ship quickly. We can also offer ‘all in one’ installation packs and design support.

Acer Heat PumpAcer All-In-One Heat Pump Packs

We offer a performance guarantee to give you full peace of mind, as well as complete pre-selected installation packs and end-to-end services from assessment to aftercare.

Performance Guarantee

Using CO2 makes our heat pumps more efficient, with simpler heating systems from high temperature generation plus grid flex for the lowest cost of ownership. We can also help you spread the cost with finance too.

Why Use CO2 in a Heat Pump?Funding Heat Pump Projects

We can help you with all the tools, knowledge and support you need to decarbonise in the most cost-effective way.

After Sales SupportHow To Use CO2 Heat Pumps For Heat & Hot Water

Clade Circle Colour


To give our heat pumps customers complete peace of mind. Following installation, commissioning and a 6 month run-in period the actual performance will be assessed against predicted performance. If the heat pump does not meet the guaranteed performance we will refund the cost of the heat pump and remove it from site.


A heat pump absorbs heat from an ambient temperature source and releases it to a warmer one. It uses an external source, such as air, the ground or water, to transfer energy and it uses a fluid called a refrigerant to facilitate this process. CO2 heat pumps work the same way, by transferring thermal energy, but they use CO2 as the refrigerant fluid. These heat pumps are environmentally friendly because the CO2 they use stays contained within the appliance and doesn’t get released into the atmosphere. Also CO2 is not toxic and only has a GWP (Global Warming Potential) of one much lower than chemical alternatives.

CO2 heat pumps are highly efficient and perfect for higher temperature requirements. They’re also cheaper, overall, than the alternatives.

Leisure Centre


CO2 heat pumps are extremely efficient, perform well for both heat and hot water, and actually work out cheaper than the alternatives.

Clade’s heat pump applications team have analysed dozens of system designs. What we’ve found is that CO2 heat pump systems are cheaper on a couple of levels:

  • The wider temperature difference between flow and return (typically 40⁰C) makes the distribution pipes, pump, valves, fitting, bracketry and lagging smaller which saves loads. Here’s an example: replacing a typical heat pump with 5⁰C DT with a CO2 heat pump reduced the main distribution pipe from DN125 to DN65, over all that saved in the region of £285,000 on the project. 
  • The high temperatures generated by CO2 heat pumps get generate domestic hot water as well as space heating. No need for more specialist heat pumps. For example; removing high temperature water source heat pumps and all the complex pipes, buffer, controls etc. can save 10 to 14% of the capital spend.  
  • CO2 heat pumps have a lower total cost of ownership, the gas itself is the cheapest refrigerant on the market and the higher efficiencies reduce electrical input cost. You can even count the reduction in carbon from the GWP of 1, some organisations value carbon between £95 and £150 per ton.  

Clade Engineering offers air, ground, and water source heat pumps and refrigeration that use eco-friendly CO2 coolant and can operate either singly or as part of a multi-unit system.

International Heat Pump Suppliers

Clade Engineer Systems design, supply, install and maintain commercial heat pumps across Europe and in Australia. All our heat pumps are made in the UK and shipped from our Technology Centre in Leeds.

Clade Map


At Clade, our CO2 heat pump services are comprehensive. We provide full support through every step of the process, from energy-efficient system design to quality manufacturing, expert installation, and ongoing maintenance. As a UK company leading the transformation in green heating and cooling, we provide CO2 heat pumps for multiple sectors, helping businesses reduce their carbon footprint. With different models of CO2 heat pumps available, we can help your company achieve ultra low-carbon, efficient, future-proof heating regardless of its size.. Our commitment to high-quality manufacturing ensures you will have a high performing green heating solution for the long term.


Our CO2 heat pumps are designed for energy efficiency and high performance in both smaller spaces and larger properties.


We provide full installation of your new CO2 heat pump. Our installation team causes as minimal disruption to your property as possible and ensures your heat pump is fully functional before leaving the site.


Clade provides ongoing maintenance for our CO2 heat pumps, which includes regular surveys and repair services. You can customise your support with our After Sales Support packages as well.


High-quality products require high-quality manufacturing. We use precise engineering and the highest quality materials to supply CO2 heat pumps optimised for long-term performance.


Our support services include commissioning engineer attendance, 24/7 service engineering support and access to Clade’s technical helpdesk during the products’ warranty period and beyond.


With its internal Research & Development team based at Clade’s Technology Hub in Leeds the company is available to advise its customers on the latest legislative changes.


When discussing heat pump efficiencies, the following terms are commonly used: coefficient of performance (COP), seasonal coefficient of performance (SCOP) and seasonal performance factor (SPF). The higher the number, the more efficient a heat pump is, the less energy it consumes, and the more cost-effective it is to operate.

Heat pump technology is well established and works well at all scales. Unfortunately the traditional refrigerant fluids used have very high GWP (global warming potential; a multiple of the impact of CO2, with many being over 600). Regulators have already outlawed the use of the really bad refrigerants and are closing the door on the others, leaving a few low GWP and “natural” refrigerants.

Clade are the UK leaders in the natural refrigerant CO2 with the lowest GWP possible of 1. CO2 is also the easiest to maintain and is comparable in cost to R32 but without the flammability or toxic nature.

Rowan Heat Pump 3


It is easy for confusion to arise, after all how can a CO2 heat pump help reduce CO2 emissions?

Combustion appliances like boilers and fossil fuel engines continuously produce CO2 as a by product of their operation, this CO2 is released into the atmosphere via the flue or exhaust.

By contrast CO2 heat pumps use Carbon Dioxide as the working fluid, the CO2 is contained permanently within the appliance. It is the thermodynamic properties of the expansion and compression of CO2 that enables a heat pump to work.

The CO2 that Clade use is captured as a by-product of other industrial processes. Unlike other natural refrigerants such as; propane which is component of natural gas, or ammonia which is made in a high carbon process.

Other types of heat pump use different working fluids, typically HFCs or HFOs which contribute more to global warming. This contribution is measured using GWP “global warming potential”, CO2 has the lowest possible score of 1.

Using CO2 heat pumps will result in an improvement in carbon reduction both directly in the heat output and indirectly through the production, service and disposal of the working fluid.

Other advantages of CO2 heat pumps include higher operating temperatures which more closely match existing heating systems and enable greater value in heat recovery. This can reduce the cost of the installation and operation of your facility.

CO2 is non toxic and inert which makes the burden of managing the risks lower than other working fluids.


The great thing about CO2 heat pumps is that they can be used for both heating and cooling down your residential home. For instance, during the summer when the sun is out, the CO2 heat pump can keep your home nice, cool, and comfortable. To do this, the carbon dioxide will absorb the heat from the air inside your home, and then release it outside.

During the cold winter months, the heat pump can be used to heat your home. To keep your home warm and comfortable, the carbon dioxide will absorb the heat from the air outside, and then release it inside. This all sounds like a very simple and straightforward process, and it really is. It’s the only way we can substantially reduce heating emissions at scale.


A CO2 heat pump uses carbon dioxide as a refrigerant. Carbon dioxide is a naturally occurring gas, and it has a very low boiling point. This makes it ideal for use in a heat pump. When the carbon dioxide is compressed, it becomes a liquid. This liquid then evaporates, and as it does so, it absorbs heat from the surrounding air.

The carbon dioxide then condenses back into a gas, and as it does so, it releases the heat that it absorbed. This process can be repeated over and over again, and it is this that makes a CO2 heat pump so efficient. When it comes to cooling a residential home, a very similar process takes place

The Thermodynamic Properties of co2


There’s no secret that every system will lose some of its gas every year as a result of leakage between the components or maintenance activities. However, when compared to CO2, which records an annual loss of around 53kg, the alternative working fluids record losses that are thousands of times higher than CO2 – making carbon dioxide a much more environmentally friendly option.

Aside from that, CO2 is non-flammable, non-corrosive, and non-toxic, which means that it doesn’t decompose within the system or when it is accidentally released. As a result of the above, CO2 heat pumps are the most efficient and cleanest way to heat your home. This is great news for the environment and for your wallet. Not only will you be doing your part to help reduce greenhouse gas emissions, but you’ll also be saving money on your energy bills.

The Heat Pump Effect

Heat Pump Effect Diagram


Clade is the UKs leading manufacturer of natural refrigerant heat pumps. With significant R&D, field trials and a proven deployed portfolio of over 500 natural refrigerant appliances there are no other UK manufacturers that come close to our expertise and experience.

Operating on a national basis from our green manufacturing Technology Centre in Leeds and our Head Office in Bristol, which has achieved CEEQUAL status and the internationally recognised BREEAM Excellent standard, we design, manufacture, supply and maintain heat pumps and refrigeration around the world.


“Over the past year TRIOS and Clade Engineering Solutions have worked closely together in delivering service to a range of retail and non-retail customers. Clade has proven to be a reliable partner and demonstrated its ability to react quickly and efficiently to customer requests and problems. Through system usage and great communication Clade has rapidly evolved as a partner of choice to TRIOS. The fact that Clade has both service and installation capabilities has given TRIOS confidence that we can rely on them in every situation, where our customers have a refrigeration or mechanical problem. Clade repeatedly demonstrates its customer focused credentials and continues to give great focus and service to TRIOS and our customers.”

Jeff Alden – Managing Director, Trios Group

Wm. Morrison Supermarkets Plc

“Clade have completed new installations on large stores, and refurbishment work within our main estate, and have many more planned in the future.

Their communication, efficiency and can do attitude make them a key strategic partner in our future within both M-Local and main estate. The key to their success with Morrisons is their transparency, and honesty. Nothing is hidden, and no conversations are off limits, they, as a team, are willing to bring new ideas to the table to make efficiencies, and also accept learnings from other teams to improve themselves.

I have absolutely no qualms in recommending them for any work, and hope that you consider them as the added benefit they can bring is invaluable.”

Tom Monaghan – Construction PM & Programme Manager, Wm Morrison Supermarket


“Clade have proved themselves to be a competent and diligent contractor for Marks and Spencer, their work has been delivered to a high standard with quality being the focus. Their deliver of M&S high profile stores has surpassed performance expectations. Clade has proved itself as a growing contractor with a bright future.”

Peter Garner – Marks & Spencer

CTS Shopfitting Ltd

“We have worked with Clade on numerous Co-op projects throughout many years and find them to be very professional and reliable with excellent communication both on and off site. The project management team work alongside ourselves and are very proactive when required.”

Martyn Clark – CTS Shopfitting Ltd

Key Property Solutions Ltd

“Thank you for the excellent work you did at M-Local Doncaster. It made a refreshing to change to come across a contractor who could adapt to change as speedily as yourselves and reacted pro-actively to anything that was required. I look forward to working with Clade again in the future.”

Lol Johansen – Key Property Solutions Ltd (Bowmer & Kirkland subsidiary)


“Clade Refrigeration (now Clade Engineering Solutions) has worked for The Co-operative Group for over 12 years. In this period they have delivered a large number of projects, some of these being high profile developments which have been installed to a very high standard indeed. Their willingness to help and Give support to the client, associated suppliers and the wider industry is noticeable, whilst they also take the time to give valuable feedback on new innovations and products. They have proved themselves in all instances to be a partner and a contractor that repeatedly delivers to the highest standards.”

Bill Watson – The Co-operative Group


Clade Engineering is able to provide heat pumps as either air, ground, or water source. The most suitable type of heat pump depends on several factors related to your property. Generally, air source heat pumps are the most popular because they have the fewest requirements to install. Any type of heat pump can provide hot water and heating to your building.

Heat pumps using CO2 refrigerant as the heat source are friendly to the environment because the CO2 they use stays contained within the appliance and does not get released into the atmosphere. Furthermore, the CO2 we use in our heat pumps has the lowest global warming potential (GWP) of 1 compared to 1000’s for other refrigerants which will all significantly reduce the carbon footprint of your building.

Clade are the industry leaders in heat pump technology. As the heat in buildings challenge became clearer, Clade began the R&D for a new range of heat pumps which would provide a solution for a growing market. The first heat pump was installed in a Co-Op store and achieved a staggering SCOP of 3.7. We have over 36 years of experience and all of our systems are designed and manufactured in the UK.

Our heat pumps meet environmental standards by using a natural refrigerant like CO2. It has a Global Warming Potential (GWP) of 1, which reduces both cost and emissions.

Clade offers a full start to finish heat pumps solution. Our team of engineers design your system, manufacture and supply your heat pumps from our product range, our installation team ensures your heat pump is fully functional and our after sales support team provides ongoing maintenance. You can pick and choose as many or as few of our services to suit your requirements.We ensure that your heat pump system continues to function. Our heat pumps can generate heat from 50kW to multi mega-watt, with a maximum water temperature of over 80 degrees Celsius and a minimum external air temperature of -20 degrees Celsius. Each of our heat pumps also comes with total cooling recovery to ensure a high quality of continued functionality.

More Heat Pump FAQs


Speak with our team of experts and discuss your requirements. Complete this quick form and we will be in touch or contact us using:

0113 887 9604

Bristol & Bath Science Park
Dirac Crescent, Emersons Green
Bristol, BS16 7FR

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