Assemblin strengthens its expertise in energy efficiency with acquisition of Enex

Assemblin Heating & Sanitation continues to strengthen its offering in green property technology by acquiring Enexergi AB (“Enex”), which specialises in energy optimisation projects for multi-residential properties, mainly in the form of geothermal heating solutions. Enex is based in Vaxholm but operates throughout the Greater Stockholm area. Enex generates annual sales of about SEK 70 million.

Enex designs and installs energy systems and equipment, focusing on sustainability, reliability and efficiency. Since the company’s launch in 2010, more than 100 energy projects have been completed from which the property owners have derived major energy savings while the buildings have become more sustainable from an environmental perspective. Services provided are predominantly installation of geothermal and solar energy systems, as well as energy recovery (heat recovery ventilation, optimising efficiency in heat recovery ventilation, water overflow recycling, etc.). Enex performs its project assignments assisted by an established network of subcontractors. Customers primarily comprise tenant-owner housing associations, but also property companies.

“Enex’s profitable operations offer superior expertise in energy efficiency – an attractive niche with favourable opportunities for growth. We are highly impressed both with Enex’s expertise, as well as its professional processes and sales approach. Enex is a good fit with our stated commitment to energy-efficient and sustainable installation solutions, and we are pleased to welcome its employees and customers to the Assemblin family,” says Andreas Aridiadis, President and Business Area Manager at Assemblin Heating & Sanitation

Enex also complements the operations of energy and water optimisation company NGL Energientreprenad that Assemblin acquired in June 2022. These companies already collaborate closely, with NGL Energientreprenad focusing on distribution systems within buildings and Enex focusing primarily on production systems.

“Having worked a long time with various types of energy saving and optimisation projects, I can say that interest in our solutions has never been greater than it is now. We have now reached the limit of what we can achieve with the company’s current structure and I perceive value in continuing to develop within a larger organisation with more developed operational support,” says Erik Nigell, CEO and Proprietor of Enex.

For further information on Enex, please see

For further information, contact:
Andreas Aristiadis, President and Business Area Manager, Assemblin Heating & Sanitation,, +46 70 935 99 77
Erik Nigell, President and Proprietor, Enex,, +46 8 588 013 20
Åsvor Brynnel, Head of Communications and Sustainability, Assemblin,,
+46 10 475 39 48

About Assemblin

Assemblin is an end-to-end installation and service partner with operations in Sweden, Norway and Finland. We design, install and maintain technical systems and solutions for air, water and energy. Our vision is to create smart and sustainable installations that make buildings work and people feel comfortable. We make this possible through close local collaboration and are supported by a strong organisation. We have annual sales of SEK 12.9 billion and about 6,700 dedicated employees at more than 100 locations in the Nordic region. Read more at