ENERsign GmbH manufactures the specially developed and patent-protected ENERsign primus system at the Wittlichsite, which is a wood-aluminum window developed for the best possible energy efficiency and is the company's only product line due to the high degree of specialization.

The certified highly thermally insulated ENERsign primus products are the result of more than two decades of specialization and experience with high-performance windows. In their conception and mature construction, these are perfectly designed for the physical loads of a passive house window.

With the excellent insulation values of the passive house window ENERsign primus, the energetic renovation, as well as the construction of passive houses, zero-energy and efficiency houses can be excellently realized.

Highly thermally insulated wall-integrated wood-aluminum passive house window system with integral frame:
- Certified for highest passive house efficiency class A, Cold Climate
- Zero-frame view form the outside with concealed sash
- Wooden frame inside with concealed hinges
- ENERcellthermal break with Aluminium outer clading
- Frame widths only 100 mm with High stability due to 121 mm profile depth
- triple glazing with multiple g-value options