Passive House Institute Certificate - is a one of a kind certification for products that meet the requirements of passive buildings. Windows certified by this institute must achieve the thermal transmittance factor Uw = 0,8 or less for the whole window and at the same time the solar heat gain coefficient for the glass g = 50% or more.
The Passive House requires high quality components: Superinsulating window frames, highly efficient ventilation units, thermal-bridge-free connection details, glazing which enables solar gains....The designer cannot easily assess the energy efficience of components and the values to be set: Specific values available from standards are often unrealistic or not accurate enough; based only on the manufacturer's information, reliable project planning is often not possible.
The Passive House Institute as an independent authority tests and certifies products in relation to their suitability for application in Passive Houses. Products which receive the "Passive House Suitable Component" certificate are tested according to uniform criteria, comparable with regard to their specific values and of excellent energy-relevant quality. Their application makes the designer's task much easier and contributes to the proper functioning of the Passive House.