Energy Saving Ordinance for New Buildings from 2016 / Single Glazing / U-values Basement Windows

Hi,

we are currently building with a developer.
According to the building description, it is being built in accordance with the "increased requirements of the Energy Saving Ordinance 2014 (Energy Saving Ordinance 2014) for new buildings from 2016."

Now we have noticed that the developer installed very simple, single-glazed window units in the basement.

The window units are located underground, behind a light well.
The basement is not living space, however, the basement is heated.
Below these window units are radiators that are operated with an air-water heat pump.

Is the U-value of 1.3 W/(m²K) according to the Energy Saving Ordinance to be complied with for these basement window units in order to meet the increased requirements of the Energy Saving Ordinance 2014 (Energy Saving Ordinance 2014) for new buildings from 2016?
Or are these window units sufficient and meet the requirements?



Best regards
rtit266

Radiators operated with an air-to-water heat pump

Have fun with the electricity costs...

There are only the 2 radiators in the basement, which probably never get used anyway. Everything else is underfloor heating. But that is not the point. The question is whether these single-glazed windows are acceptable for compliance with the energy saving ordinance or not.

Single glazing has a U-value of about 5.0. But it depends on the sum of the U-values of the whole house; if the rest compensates for it, at least it is okay from a calculation perspective. But that single glazing and iron profiles are nonsense you can figure out yourself.

Is the basement located within the thermal envelope? If not, the windows wouldn't really matter, but then I don't understand the purpose of the radiators...

Above all, .. how are the radiators operated? Was the flow temperature of the heat pump specifically increased for this? If so, in terms of efficiency, it would be a disaster with an air-water heat pump (even if you never use the radiators...).

You need to provide a bit more information, otherwise there's no way to make progress here.

There are only the 2 radiators in the basement, which probably are never used anyway. Everything else is underfloor heating.
But that's not the point.

Even if it is not the topic, as writes, even if you do not use the radiators, the heating system must be built to work, which increases your electricity costs by about 30%.
Your actual question cannot be answered like this. As mentioned, in new buildings the overall package counts, so the energy saving ordinance calculation must prove that it works. Permissible or non-permissible U-values exist only in existing buildings.