+49 (0) 221 / 999 831 50



BEST Hardware

More light, more life, more warmth: With our plastic window ENERGATE® 843 we have developed a product which is mighty impressive due to its stylish design and exceptionally slender profiles, and, thanks to excellent heat insulation values, which guarantees a high standard of comfort. The plastic version ENERGATE® 843 can be used in numerous applications and is extremely durable. Whether in a future-proof new building or an energy-retrofitted old one: The all-round window with its wide variety of shapes provides ample opportunity for your individual design wishes.

The plastic version is made of a durable material which is particularly resistant to soiling and weather influences. The integration of UV stabilizers prevents the color from fading.


  • Best thermal insulation values
  • Uglazing = 0.088 Btu/ft² hr °F| g = 61 – 11% Psi ~ 665 Btu/h ft F (special fibreglass spacer)
  • Airtightness: certified by blower door tests
  • Certification by accredited testing facilities
  • Triple seal
  • All products are CE-certified
  • Many product type
  • Planning and construction with modern 2D & 3D planning system (*.dwg, *.dxf, REVIT)

ENERGATE systems:


 Technical Data Sheet

Thermal insulation values:

Uw- W/m2K 0,72*

* Values specified are calculated for tested window: Dual action, single opening window with triple insulating glass Ug = 0,5 W/m²K · Size: 1,20 x 1,50 m; Norm: Psi glass and Psi installation 10077:2 Uf EN ISO 8990

Passive house patio door balcony

PVC Windows & Doors

More light and energy for your home


Send us your request, we are happy to assit you.

We looking forward to hearing from you!

  Request form