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In our experience PSDS projects seem to have some unusual aspects that can lead to sub-optimal outcomes for the public sector buildings. The funding requirements change the flow of design and apply criteria that force sub-optimal solutions.

This leads to wasteful or inefficient heat pump projects which do not live up to the capabilities of the technology.

As we’re all UK tax payers we should have an interest in the long term performance of public buildings. After all we’ll have to pay to put poor installs right, so why not get it right in the first place?

Below are a few tips and suggestions we’ve picked up whilst working on these projects. Or if you’d like to talk to us about how we can help, click below:

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The heat pump manufacturer must provide technical input into the design team from an early stage. Much of the industry is still learning about heat pumps and there are a wide variety of types which we’ve seen lead to poor specification. Technical input from the manufacturer will guide the design team towards a good design and specification. For example our Applications Engineering team will review designs and our Product Engineering team will help specify the heat pump compressors, heat exchangers and controls for optimal performance. If the heat pump manufacturer is unable to provide this support then they are not the right supplier.

Rowan Heat Pump 3


Design for maximum COP, using total cost of ownership models to show the value over time. Installing a cascade air-then-water heat pump arrangement might look simple because it can replicate boiler temperatures, but its COP is disastrous. In the end it does no one any favours. Read our blog for more information about what COP is.

Oak 250kw Green


Select the heat pump heat exchangers that are optimum for the building operating temperatures and flow rates. Don’t compromise with off-the-shelf heat pumps that force a sub-optimal heat exchanger selection, this will lower the actual performance of the heat pump.

Aspen Heat Pump


Secure your heat pump delivery by working with your supplier. The global supply chain for heat pumps and components is extremely stretched. There are many reasons for this and industry predictions are for the situation to continue for some time. Clade operates an extremely flexible, multi-source supply chain which minimises delivery times, and builds in resilience should a shortage occur.

Oak Heat Pump


Don’t use multiple small units. We’ve seen designs featuring 16 or more small heat pumps. When install cost is taken in to account these cost more than a single commercial heat pump and don’t feature the benefits of commercial specification (e.g. a full oil management system, efficient defrost with minimal impact on heat delivery). Resilience is often cited as a reason for this approach but this is a misunderstanding. Multiple unit systems still have single points of failure, for example the power supply or header. Turn down ratios of multi compressor commercial heat pumps are around 10% of total capacity, more than enough for building applications. Components are also better quality on commercial heat pumps because they are designed for a long service life, plus the units are almost infinitely serviceable.

1200kW v16

In summary public sector buildings are benefiting from PSDS funding from Salix. We have only a short time to decarbonise heat (estimates give us 8 years of carbon budget remaining) and so we have a duty to get this right. As a UK manufacturer Clade is dedicated to getting it right.



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


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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