Airex validated under first ever ECO Demonstration Action field trial

Green Angel Syndicate has come a worthy second in the close race for the hotly contested Best Angel Syndicate award at the fourth annual Growth Investor Awards, sponsored by Intelligent Partnerships. 

Nick Lyth, CEO and co-founder of Green Angel Syndicate, said: 

We are delighted to be recognised in this manner by these prestigious awards.  It is always encouraging when our specialist purpose is acknowledged to be important. 

Amid intense competition, Green Angel Syndicate was praised for the work the company has done with Powervault. The judges were especially impressed with the calibre of support for the business.  

The Best Angel Syndicate award honours recognised angel syndicates while highlighting the crucial role angel investing plays in the SME investment ecosystem. Entrants had to provide clear evidence of offering investment at crucial stages of investee company growth. Above all, the judges looked for measurable ‘impact beyond investment’ through syndicates’ invaluable support, experience, and strategic direction to investee companies. 

Guy Tolhurst, managing director of Intelligent Partnership, said: 

“It’s great to see that Green Angel Syndicate’s work with London-based energy storage company Powervault has clearly demonstrated its exemplary commitment to adding value to its investee companies.” 

About the Growth Investor Awards 

Launched in 2015, the Growth Investor Awards have rightly become a major focal point in the UK’s SME investment community calendar. The awards celebrate companies and individuals involved in putting investment to work in high-potential businesses. They honour those providing or helping to source investment and leading players that are helping to optimise growth capital for scaling UK companies.  

About Green Angel  Syndicate 

Green Angel Syndicate is the only specialist green angel syndicate in the UK, made up of a network of smart investors who are committed to the transition to a greener economy. We support early stage technology companies developing products and solutions specifically for a more efficient and sustainable use of global resources.  

If you want to find out more about becoming a green angel, contact Nick Lyth at 

For press information contact Nick on 07802 150053 

Funded by Innovate UK , the Angel Investment Accelerator is the first accelerator in the UK designed for Angels and offers a wide range of support.

The Angel Investment Accelerator programme is a the first accelerator of its' kind - a programme designed by angels, for angels. Are you looking to start angel investing and connect with like-minded and well-established local angel groups? Be part of the Angel Investment Accelerator and learn the do's and don'ts of angel investing, collaborate with local angels and play a role in growing the UK's leading innovators.

This unique Q&A sessions will shine a spotlight on the South West and Wales and the local opportunities available for those taking the jump into angel investing.

Hosted by UKBAA's Managing Director, Roderick Beer, this live Q&A session will cover all of the exciting opportunities and resources offered by the Angel Investment Accelerator including, educational workshops, connections to local angel networks and more.

For more information click here.

Ofgem-approved smart air brick technology AirEx successfully completed the UK's 1st Demonstration Action under the Energy Company Obligation (ECO) scheme, with 12%-16% heating energy savings independently validated based on robust (115 homes) field trial.

ECO is a government initiative placing legal obligations on large energy suppliers to deliver energy efficiency and heating measures to homes across the UK. As part of the scheme Airex innovation was deployed in a large field trial across 115 homes , during 2019/20 winter, sponsored and supported by EDF, in partnership with Portsmouth City Council and Walsall Housing Group. Occupied homes were monitored throughout the winter heating season, with delivery partner Build Test Solutions supporting the thermal performance measurements of trial homes, using their unique SmartHTC methodology to measure heat loss.

The results of this robust field study show that AirEx

  • reduces whole house heat loss by 12% - 16%;
  • reduces ground floor heat loss by 20% - 23%.

Please download the full report here.

These results place AirEx as one of the most cost-effective energy efficiency solutions on the market, with a modest payback of 2-3 years based on a £450 installed price. Based on the trial results, it was calculated that AirEx improved the energy efficiency of an average 3-bed, semi-detached, gas-heated UK home by 3 SAP (EPC) points. As such, AirEx delivers a cost of £150 per SAP point gained.

AirEx provides low-cost solutions for reducing fabric heat loss, improving thermal comfort and protecting residents' health by passive airflow control. The system is an innovative 'intelligent air-brick', which uses sensors and smart algorithms to selectively open and shut air vents, reducing fabric heat loss. The system is passive, does not require electrically qualified installers, it can be installed in less than an hour, and it pays back in 2-3 years through reduced energy bills. Based on the learnings from the field trial, the potential for rolling out Airex across the UK and beyond is enormous.

Agnes Czako, Co-Founder and Managing Director of AirEx said: "We are incredibly pleased about the fantastic results of this study, and thankful for our supporters, EDF Energy and BTS to help the Airex team making this happen. We are looking forward to the next phase of rolling Airex out across the UK social housing, contributing to the UK's net zero goals while tackling Fuel Poverty".

Paul Howell, EDF's Senior Manager of ECO said: "Technically this is a simple product, quick to install and relatively cheap, so the potential return on investment (on time and cost) is great as an innovation measure. EDF is proud to provide resource and financial support for ECO innovation, and believes that the AirEx product can really make a difference to improve energy efficiency and benefit the fuel poor."

For more information please contact AirEx at AirEx and its partners will be happy to assess your housing stock, estimate funding options and secure ECO3 funding on your behalf.

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