ENERGETO®
Narrow sightlines, longer lifespan, and improved energy performance.
The technology for modern windows.
Advantages of energeto®-technology:
Lightweight and durable
The use of glass fiber-reinforced plastic strips instead of conventional steel reinforcement significantly reduces the weight of the window sash. As a result, the window hardware is permanently relieved of stress, leading to increased lifespan.
Relief of hardware.
EFFICIENT
Energy efficiency values are significantly improved by replacing the steel thermal conductor with the energetically superior energeto® strips. This allows for funding by KfW (German Development Bank) and savings of up to 20% on heating costs.
Lower heating costs thanks to energeto®.
LONG-LASTING
By using lightweight energeto® strips, the weight of the window sash is significantly reduced, resulting in less stress on the window hardware. This well-designed window requires less maintenance and has a longer lifespan.
Durable windows thanks to energeto®.

Comparison between fiberglass (GFK) strips and steel:
Unlike traditional reinforcement of profiles with steel*, “brand” Windows utilizes energeto® technology, which stabilizes the windows using fiberglass-reinforced plastic (GFK) strips. This material has been used for decades in applications such as wind turbine rotor blades, shipbuilding for motor and sailing yachts’ hulls, as well as in aircraft construction for fuselages and wings of sailplanes and high-performance motor aircraft.
The use of increasingly heavier glass panes, such as functional glass for burglary protection, personal safety, soundproofing, or thermal insulation, significantly increases the weight of window sashes. To counteract this trend, our window systems with energeto® technology replace the heavy steel reinforcement with significantly lighter fiberglass-reinforced plastic (GFK) strips.
The reduced weight reduces the stress on the hardware and profiles, thereby increasing the lifespan of the windows. Additionally, the stability is enhanced by the corner connections of the GFK strips. When combined with triple glazing, windows with energeto® technology are eligible for KfW (German Development Bank) funding and can save up to 20% on heating costs throughout the year. Moreover, the profiles become narrower, allowing for larger glass areas and resulting in a more modern exterior appearance. These windows are more stable, lighter, energy-efficient, and require less maintenance—a valuable investment in the security and future of the property.
*Use of steel reinforcement as per the system provider’s specifications.
Profile with energeto® strips:

Profile with steel reinforcement:

energeto® and adhesive technology – the perfect combination.
Only the combination of energeto® and our key technology, adhesive technology, enables us to produce windows with very low weight. This, in turn, significantly reduces the stress on the window hardware, thereby increasing the lifespan of the windows. Additionally, the adhesive bond between the glass and the window sash enhances burglary protection. “brand” offers glass bonding according to RC2 (Resistance Class 2) through adhesive technology as a standard feature – one of the essential requirements for achieving the RC2 security level. This means that without adhesive technology, you cannot obtain a window of the RC2 security level. Furthermore, adhesive technology greatly improves energy efficiency values, which is crucial for potential funding of your new construction or renovation project by KfW (German Development Bank) – resulting in savings of up to 20% on heating costs!

Products
Window Models
Safety, energy efficiency, indoor health, design, and durability are the features with which you equip and design your home. Our window series are designed and manufactured according to these requirements. The profiles of our window series are available with frame depths of 70mm and 85mm, allowing all our window models to be easily equipped with triple glazing. The brand windows constructed in this way exceed the Uw value of 0.95 W/m2K required by KfW for funding. This not only benefits the environment but also saves energy and costs.
Our Product
We Ensure Tested quality




All products from SIGMA and Fenstertechnik brand GmbH undergo regular quality and product safety checks conducted by independent institutes according to standard guidelines.
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