GENEO - The New Dimension in Energy Efficient Window Systems

The GENEO® window system is manufactured using the high-tech RAU-FIPRO®material resulting in windows with a reduction in energy losses of up to 76%*.

Thanks to technological advances and performance characteristics, windows constructed from GENEO® profiles put all previous window systems in the shade.

- The first fully reinforced window profile system
- Constructed from the high-tech material RAU-FIPRO®
- The most energy-efficient profile for windows ranging from low energy houses (e.g., Uw = 1.1 W/m²K) to passive solar house standards (e.g., Uw = 0.73 W/m²K).
- The best possible level of sound insulation without steel reinforcement, achieving previously unattainable values (glass 50 dB = Rw,P 47 dB) for sound insulation class 5 – and including optimal thermal insulation.
- Break-in protection up to resistance class 3. Without steel reinforcement, resistance class 2 – including optimal thermal insulation.
- High levels of investment security by meeting current and foreseeable Building Regulation standards1), thus ensuring long-term value for your property.

In terms of energy efficiency, GENEO® is the best window profile currently available on the market in the UK with an 86mm profile depth. Consequently, with GENEO® profiles it is possible to achieve the most energy efficient window products of their class, creating an unsurpassed comfortable environment.

The innovative material formulation created by REHAU results in window profiles with high stability, torsional stiffness and static properties, which were previously not possible without the addition of steel reinforcements. RAU-FIPRO® has been developed based on fibre composites used in aircraft construction and Formula 1 vehicles bringing high end technology to the window manufacturing industry.


  • Profile depth: 86mm / Centre seal
  • Number of chambers: 6
  • Thermal insulation: Uf = up to 0.85 W/m²K
  • Energy saving: up to 76%*
    *Reduction in the energy loss from windows when replacing old wooden/plastic windows from the 80s (Uf= 1.9, Ug= 3.0) with windows made from GENEO® profiles (Uf= 0.91, Ug= 0.5, window size123 x 148 cm)
  • Material: RAU-FIPRO® fibre composite material, coextruded outer layer all the way around made from high quality RAU-PVC for the best surface quality
  • Sound insulation: up to SSK 5 without steel reinforcement, RwP = 47 dB with glazing Rw = 50 dB
  • Burglary resistance: up to resistance class 3, up to resistance class 2 without steel
  • Air permeability: 4 (DIN EN 12207)
  • Protection from driving rain: 9A (DIN EN 12208)


  • Many architectural possibilities using individual shapes, e.g. round and triangular windows and also chamfering and Georgian bar techniques
  • Extensive range of design options using colouring with decorative foils as well as lacquering
  • Light grey gaskets with white profiles and black gaskets with coloured profiles create highlights
  • 20° chamfering and 5mm external radii for an elegant look


  • Fully self-reinforced window system without additional steel reinforcement
  • Excellent stability due to a high quality material, perfect profile design and an integrated self reinforcement system (IVS)
  • When fabricated with appropriate glass, windows made from GENEO® are suitable for passive houses
  • Sightline of 115 mm to let maximum light in
  • Efficient storage and production due to full self reinforcement
  • Easier handling and assembly due to up to 40 % weight advantage compared to conventional window profile systems
  • Functional chambers to optimise the insulating properties with thermomodules
  • Large rebate depth of 66 mm to hold triple glazing
  • Reduced closing pressure and therefore noticeably easier opening and closing due to the newly developed gasket geometry
  • High definition finished-surface: extremely high quality, exceptionally smooth and therefore particularly easy to maintain
  • Environmentally friendly, as it's recyclable



Passivhaus Certfied Office

The REHAU AWADUKT Thermo ground – air heat exchanger  & GENEO® windows and doors have been installed in only the third office in the UK to be fully certified to Passivhaus standard. 

The new regional office for Interserve Construction Limited in Syston, Leicestershire features some of the most advanced green building solutions to achieve a targeted 90% reduction in energy usage and costs compared with a traditional building. 

27 windows and four doors from the GENEO® system were  installed in the £1.5m, 680m² Passivhaus certified office, the majority of which were across its south facing aspect to increase solar gain in winter and minimise the requirement to generate additional heat.  The 86mm REHAU GENEO® window is manufactured using the 100% recyclable RAU-FIPRO® fibre composite material, which is similar to the kinds of fire composites already used extensively in aircraft construction and Formula 1 design. 

The inherent strength of this material enables the six chambered REHAU GENEO® system to perform without any requirement for steel in standard sized windows, eliminating the thermal bridges which can occur in conventionally reinforced PVC-U and which result in energy being lost. 

Passivhaus construction focuses on making the building as well insulated and air tight as possible, specifying the right ventilation solution is essential.  In conjunction with environmental building services consultants Couch Perry & Wilkes, Interserve chose the REHAU AWADUKT Thermo system because it was appropriate for the compact site and was more cost effective than a borehole solution. 

The REHAU Thermo system uses the natural temperature of the earth at a depth of 2m to pre-warm or pre-cool incoming air.  Optimised polypropylene pipework maximises the heat transfer which takes place so that in summer incoming air can be cooled by up to 14º C and in winter it can be warmed by as much as 9º C, achieving a Coefficient of Performance of around 20. 

The system has particular benefits for an air tight building such as this one because it incorporates an integrated antimicrobial layer made from silver particles which eliminates the risk of microbial growth or musty smells. 

The new building has no gas fired space heating and relies for its heat on solar gain from its south facing aspect and from the tempered air delivered via the AWADUKT Thermo and MVHR systems. 

A small heat pump is in place to provide additional warmth in winter if required. 

The new building has been constructed using highly insulated blocks with concrete infil, pre-cast concrete beams to provide some additional tempering, and is clad in timber to increase the insulation performance.

The Rehau GENEO window design is for the eco-conscious home or building owner serious about energy efficient. Our innovative, high tech material and unique profile design takes Rehau technology to its highest levels of strength and thermal performance, while the 40% lighter profile reduces transportation and installation cost. This system is offered in a variety of colors and finishes.

1. Profile Core: Ensures excellent stability and torsional rigidity making it possible to build larger windows without steel reinforcement

2. Six Chambered Frame: Provides unmatched thermal insulation, surpassing the requirements of the U.S Department of energy R-5 window program and making achievement of german passive house standard possible

3. Innovative compression-seal technology: reduced closing pressure significantly, making window operation easy and extending the service life

4. Multiply locking points surrounding the sash: provide extra security, tighter seal and greater comfort

5. integrated reinforcement system with screw bosses: allows highest installation stability and security

6. 2 19/32 in (66 mm) glazing channel: accommodates triple glazing, increasing both energy efficient and acoustical properties