Research by the Passivhaus Institute proves the positive impact of warm edge spacer bars like SWISSPACER on a building’s energy efficiency. For the first time, the independent Passivhaus Institute in Darmstadt looked at the impact of both aluminium and warm edge spacer bars and the overall energy requirements of buildings in different climates.

Using warm edge spacer bars instead of aluminium in a triple glazed window saves homeowners an average of 8.6 percent on energy bills in cool/moderate climates such as the UK and Ireland. That’s the equivalent of 180kg less CO2 per household every year. Homeowners living in colder climates can expect to save around 7 percent. Warm edge spacer bars bring health benefits as they prevent the build-up of condensation at the edge of the glass. The research concludes that the amount saved by homeowners on energy bills significantly outweighs the slightly higher costs of manufacturing warm edge spacer bars.

Jan Hiersemenzel, SWISSPACER Marketing Director for Europe comments: “SWISSPACER is a small component with a big impact. This latest Passivhaus research proves warm edge spacer bars such as SWISSPACER make a tangible difference to energy performance, saving homeowners an average of 8.6 percent off heating bills in low energy buildings in climates like the UK and Ireland.

“The Passivhaus Institute is the leading authority on low energy buildings, setting the standard for the most energy efficient homes, offices, schools and public buildings. SWISSPACER Ultimate was the first warm edge spacer bar to gain Passivhaus accreditation and is widely specified in low energy installations. The Passivhaus database of certified components lists SWISSPACER in 70% of windows, 86% of windows with fixed glazing and 97% of curtain wall systems.”

Founded in 1996, the Passivhaus Institute is an independent research institute which has played a crucial role in the development of the Passivhaus concept, the fastest growing energy performance standard in the world. It aims to dramatically reduce the need for space heating and cooling, and typically cuts energy use and CO2 emissions by a factor of 10. The standard requires a Passivhaus to have an excellent thermal performance, exceptional airtightness and mechanical ventilation. The heating requirement in a Passivhaus is reduced to the point where a traditional heating system is no longer considered essential. Visit for more information.

SWISSPACER is the worldwide warm edge leader, tried and tested for outstanding energy efficiency and long-lasting results. Learn more about SWISSPACER by calling 01908 335190, visit or follow @SWISSPACER.


Return To Newsletter