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Clade Engineering’s propane heat pump offers a hydrocarbon-based heating solution that prioritises sustainability. This heat pump operates with propane refrigerants that are free from F-Gases, making them an environmentally-friendly choice for commercial and industrial use. What’s more, propane heat pumps provide a future-proof solution for your heating needs.

Aspen, propane air source heat pump

The Aspen is our propane air source heat pump. It’s ideal for smaller applications up to 200KW. The Aspen is a more affordable, low carbon solution for lower flow temperature but still delivers superb low-carbon heat service with a low GWP refrigerant.

It offers flow temperatures up to 65⁰C and return temperatures in the range of 40⁰C to 50⁰C.



The Birch serves as our flagship r290 propane heat pump, earning praise for its aesthetic appeal, and is also available in a low-noise version. It is offered in two models: the 85/50 and the 120/75, providing 85 and 120KW at +7°C ambient temperature, or 50 and 75KW at -5°C ambient.


Rowan, compact & easy to install

Our new Rowan range of r290 propane heat pumps takes over from the Birch at 150KW and goes up to 375KW at -5C ambient.

It complements our Aspen range being more compact and with a reversible header for easy installation.

Rowan features Siemens controls and full connectivity so we can connect and monitor your heat pumps for grid flex and performance. We can also provide acoustic attenuation for noise sensitive sites as an option, all in any colour you like.

All Clade heat pumps use natural refrigerant for the lowest environmental impact and are manufactured in the UK with full support provided by our engineers here in the UK.



Propane is a gas, it’s flammable, it’s explosive, but it’s a great refrigerant which has a low climate impact because it is not being burnt for heat but used in a vapour compression cycle. Propane is one of the hydrocarbon natural refrigerants and in many ways propane as a refrigerant is similar to CO2. As part of the natural refrigerant classification it is low GWP (global warming potential), will not be subject to regulatory restrictions and is widely available at low cost.

As a pure refrigerant rather than a blend such as an HFO there are two advantages. Firstly, there is no glide which makes for an efficient heat pump. Secondly, the system can be topped up without affecting the refrigerant balance and therefore operation. So far so similar to CO2.

Propane heat pumps are ideal for medium temperature requirements. Our propane heat pump is called the ‘Aspen’ and is ideal for smaller applications – affordable, low carbon and superb heat service.

Unlike CO2, propane operates at different temperatures which gives options for system design. It has a maximum flow temperature of 65C but is usually operated at 60C with a 40C return temperature, making it a “mid-range” refrigerant. It’s true that propane is unable to reach the higher temperatures of CO2, but 60C is still useful and can be applied in many retro-fit, new build applications. Even instantaneous hot water is possible depending on the situation.

The efficiency as measured by COP is sensitive to flow temperature and not so sensitive to return temperature which is the opposite of transcritical CO2. Propane heat pumps are mainly used at 60C and below flow where realistic COPs are about 2.8. Higher COPs are possible at lower flow temperatures.

The flexibility on return temperatures, between 30 and 50C, makes propane suitable for poorly controlled, low DT systems. Despite this, nearly all systems will require some modification in heat emitter selection, controls valves and logic. This is true of any heat pump that is replacing a fossil gas boiler.

Unlike CO2, propane is flammable. This means it requires a different approach to design and operations with the appropriate measures being taken to control the risk. Whilst propane can appear to be hazardous when compared to other refrigerants it should actually be compared to other flammable gas installations such as tanks of LPG. Buildings routinely have LPG tanks, gas mains and bottled gas in use without undue concern. With some sensible safety measures the risk can be mitigated. For example, propane is denser than air, so if a leak occurs it will displace air and drop to the lowest point and so should not be sited near drains or vents. When used in a plant or machinery rooms there are predetermined levels which, if detected, will require the heat pump to shut down, ventilate and raise an alarm. These levels are well below the concentration required to cause a fire.

Propane is used in refrigeration and in large scale heating applications and has been well proven over years of use. It is widely cited as the refrigerant of choice for domestic applications because it works at micro scale too. With expert design which applies well understood controls the risks are minimal, certainly less than many other risks we have in our buildings.

If your application doesn’t need the high temperatures of CO2 and is not efficient enough to give low return temperatures then propane is the right choice.


Clade is proud to be a UK industry leader in the transformation to green heating and cooling. Our heat pump services are wide-ranging. From the designing of energy-efficient systems to quality manufacturing to expert installation and ongoing maintenance, we provide full customer support from the first step in the process to the last. Clade supplies propane heat pumps for various sectors to help businesses reduce their carbon footprint and make a positive impact.

We can help your company achieve ultra-low, more efficient and future-proof heating, whatever the size. Clade is committed to continuing our mission of using our expertise to ensure you have the right high-performing green heating solutions.


We use our years of experience and expertise to design the most efficient propane heat pump. Our experts design our heat pumps for maximum energy efficiency and the highest levels of performance in spaces and properties both large and small.


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


Clade is able to provide full installation of your new propane heat pump. Our expert team has many years of experience installing heat pumps with minimum disruption to your property. And we ensure your heat pump is fully functional and working optimally as it should before leaving the site.


We pride ourselves on our commitment, so we provide ongoing maintenance of our propane heat pump. Our maintenance includes regular extensive surveys and repair services. All our customers are able to customise their support through our After Sales Support package.


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


Clade is committed to its mission to lead and create a carbon-neutral world. Our internal Research and Development team, based in Clade’s Technology Hub in Leeds, stays on top of the newest innovations and technological advancements to continuously improve our services.


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


Propane is a natural refrigerant with a GWP of 3.

60C normally and up to 65C in some applications.

The heat pump will detect the leak, it will then shut down and ventilate the housing. An alarm will be raised with a visible beacon on the heat pump itself.

The highest COP a propane heat pump can achieve is about 4.5.

Propane is flammable and needs to be managed properly. You should carry out a site risk assessment which will define the specific measures required. Clade will provide the product and some general information required for this. This should be completed as part of the design process, we recommend a HAZID/HAZOP approach.

We build 50KW, 100KW, 150KW and 200KW models. These can be installed in a cascade arrangement for higher capacities.

The biggest issue is the flammability. Otherwise propane is low climate impact, cheap and available plus its high performance.

Yes, we offer full design and specification support at all project stages. We also provide service and maintenance services post installation.

Clade’s Engineering team will happily review your project and make recommendations for you. You can also benefit from our performance guarantee which gives full peace of mind.

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.


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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