What are the requirements for passive house windows?

In order to achieve passive house certification, windows must not exceed a UW value of 0.8. Since the introduction of the Energy Saving Ordinance (EnEV), the U-value (heat transfer coefficient) has replaced the k-value to provide a uniform, Europe-wide designation. This value describes how much energy or heat per m 2 of window area can escape from the inside of the building to the outside. A passive house window has no specifications in regards to materials. It makes no difference whether the windows are made of wood, plastic or aluminium. In principle, any material can be processed into a passive house window as long as it meets the U-value requirements. Passive house windows are certified by the Dr Wolfgang Feist Passive House Institute. According to this institute's standards, the entire window, including the glass and frame, must not exceed a U-value of 0.8. The window should have a g-value of ca 50%. The UW value represents the thermal transmittance of the frame (U f ) and the glass (U g ).

Are passive house windows suited for both old and new buildings?

Passive house windows are suitable for both existing houses and new construction projects. Even if you are not trying to achieve passive house certification, installing windows that meet the passive house standard improves the energy balance of your house and reduces heating costs. Thermal images clearly show that inadequately insulated windows are the primary source of energy loss. Binding minimum energy efficiency standards for windows were not defined until 1995. As a result, windows installed before 1995 generally have a significantly lower energy efficiency standard than modern windows.

Where can I buy heroal passive house windows?

You are looking for suitable windows for your passive house? Certified heroal passive house windows are available from our heroal specialist partners. They manufacture windows individually for your passive house. Our experienced specialist partners will provide you with advice in advance, and take care of a professional installation of your heroal passive house windows.

What does the U value for passive house windows mean?

The U-value (heat transfer coefficient) describes the efficiency of a window in terms of thermal insulation and heat transfer. Since the introduction of the German Energy Efficiency Directive (Energieeinspar-Verordnung, EnEV), this has replaced the k-value. This allows the measured values to be compared across Europe. The U-value indicates how much energy per m 2 of window area can escape from the inside to the outside. A lower heat transfer coefficient means that less heat can escape through the window, representing a higher level of energy efficiency. The thermal transmittance of the entire window (U W ) is divided into a U f and a U g value, where the U f value reflects the thermal transmittance of the window frame and the U g value reflects the value of the glazing

Passive house windows

Aluminium windows from heroal are real energy savers and are therefore certified by the Passive House Institute Dr. Feist for passive houses.

Passive house windows

Certified passive house windows as energy savers

What’s so special about heroal passive house windows?

Very low design depth

The window system heroal W 77 PH stands out for its excellent thermal insulation features, while at the same time offering a very slim design depth of only 77 mm. In addition, it has been granted passive house certification by the independent institute PHA (Passive House Institute Dr Wolfgang Feist).

100 % foam filled

The foam filling process developed by heroal ensures that the insulating chamber is 100 % filled with PU foam. Because of this, ideal heat insulation values can be achieved, even with slim frame widths.

Insulating strip geometry

The innovative geometry of the insulating strips reduces the flow of energy and conduction of heat. With a profile design depth of only 77 mm, heroal windows achieve U-values meeting passive house standards.

Components of heroal passive house windows

There are many components that make the heroal passive house window a particularly effective energy saver. These include the factory profile compound, the heroal foaming process, a special thermal insulation glass, patented thermal break technology, an optimised isothermal curve and themodular

heroal passive house windows at a glance

heroal W 77 PH

With a U_f value of 0.78 W/m²K and a U_w value of 0.79 W/m²K, a low construction depth and a narrow face width, the window frame meets all the requirements of the Dr Feist Passive House Institute.

heroal W 77 PH >

heroal W 77 HI

Through the intelligent combination of geometry and material, the window system achieves a U_w value of 0.72, which meets passive house standards (U_w≤ 0.80 W/m²K).

heroal W 77 HI >

heroal W 72

With a U_wvalue of 0.84, the window system meets the requirements of EnEV 2016 (U_w≤ 1.0 W/m²K).

heroal W 72 >

Passive house certification by the Dr. Feist Passive House Institute

heroal passive house windows are certified by the Dr. Wolfgang Feist Passive House Institute. As an independent body, the Institute tests and certifies products for their passive house efficiency levels. The Institute tests all products according to uniform criteria, which ensures that they can

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Advantages of heroal passive house windows

With heroal passive house windows, you can be sure of the highest energy efficiency. Innovative technologies make it possible to achieve small construction depths and narrow face widths with superior U-values.

passive house certified
modular insulation zone structure
optimized isothermal progression
patented thermal break technology

FAQ

What are the requirements for passive house windows?

In order to achieve passive house certification, windows must not exceed a U_W value of 0.8. Since the introduction of the Energy Saving Ordinance (EnEV), the U-value (heat transfer coefficient) has replaced the k-value to provide a uniform, Europe-wide designation. This value describes how much energy or heat per m² of window area can escape from the inside of the building to the outside. A passive house window has no specifications in regards to materials. It makes no difference whether the windows are made of wood, plastic or aluminium. In principle, any material can be processed into a passive house window as long as it meets the U-value requirements. Passive house windows are certified by the Dr Wolfgang Feist Passive House Institute. According to this institute's standards, the entire window, including the glass and frame, must not exceed a U-value of 0.8. The window should have a g-value of ca 50%. The U_W value represents the thermal transmittance of the frame (U_f) and the glass (U_g).
Where can I buy heroal passive house windows?

Are you looking for the right windows for your passive house? You can obtain certified passive house windows from heroal through our heroal specialist partners. They will custom-make the windows specifically for your passive house. Our experienced specialist partners will advise you in advance and carry out the professional installation of your heroal passive house windows. Use the specialist partner search to find suitable companies in your area and easily submit your enquiry online.
Find a specialist partner now >
What does the U value for passive house windows mean?
The U-value (heat transfer coefficient) describes the efficiency of a window in terms of thermal insulation and heat transfer. Since the introduction of the German Energy Efficiency Directive (Energieeinspar-Verordnung, EnEV), this has replaced the k-value. This allows the measured values to be compared across Europe. The U-value indicates how much energy per m² of window area can escape from the inside to the outside. A lower heat transfer coefficient means that less heat can escape through the window, representing a higher level of energy efficiency. The thermal transmittance of the entire window (U_W) is divided into a U_f and a U_g value, where the Uf value reflects the thermal transmittance of the window frame and the Ug value reflects the value of the glazing

U_w(w = window): Heat transfer coefficient of the entire window

U_f(f = frame): Heat transfer coefficient of the window frame

U_g(g = glazing): Heat transfer coefficient of the glazing
What does the g value for passive house windows mean?

The g-value (solar energy transmittance factor) describes the total energy permeability of a transparent component such as window glass. The g-value consists of two components: the proportion of solar radiation that passes through the window and the heat emitted by the glass to the interior by solar radiation. A g-value of 1 represents a heat gain or an energy transmission of 100%, which represents a complete conversion of the incident solar energy. Windows normally achieve a g-value of 0.85. This means that 85% of solar energy can be converted directly into heat. A more energy-efficient triple glazing achieves a g-value of 0.55. This means that the interior is not heated as quickly by the solar energy. This is particularly advantageous in the summer, as the interior of the building stays cool longer.
Who installs heroal passive house windows?

By ensuring your passive house windows are fitted correctly and professionally, you can achieve the highest possible energy efficiency. heroal has more than 3,500 fitters across Germany. They will help you choose your passive house windows and ensure a quick and hassle-free delivery, as well as a professional installation. Our specialist partners can also remove your old windows on request. Using the specialist partner search on our website, you can quickly find suitable contacts in your area and submit your enquiry conveniently online.
Find a specialist partner now >
Are passive house windows suited for both old and new buildings?

Passive house windows are suitable for both existing houses and new construction projects. Even if you are not trying to achieve passive house certification, installing windows that meet the passive house standard improves the energy balance of your house and reduces heating costs. Thermal images clearly show that inadequately insulated windows are the primary source of energy loss. Binding minimum energy efficiency standards for windows were not defined until 1995. As a result, windows installed before 1995 generally have a significantly lower energy efficiency standard than modern windows.

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