Drain pipe in the exterior wall - KFW55 solid house

Hello everyone,

we are building a KFW55 solid house with 36.5 Poroton bricks. Now, of course, the sink and the dishwasher in the kitchen are located on an exterior wall, which leads to the drainage pipe being planned in the exterior wall. It is a stretch of about 2.5 meters.

Our energy consultant said this is not compliant with the Energy Saving Ordinance, but it would not be a problem for him. The construction company says this is done very often in KFW55 houses with kitchens, because otherwise a facing wall is needed, and nobody wants that in the kitchen. The slot would be insulated to reduce the thermal bridge.

Who among you has built a KFW house and placed part of the drainage pipe in the exterior wall?
Were there any problems with KFW or other objections?

Many thanks in advance.

Was there any kind of problem with the KFW or other objections?

No, no objections on my part. If your energy consultant approves it, then everything is fine, right? You are worrying too much. Everything is great like this.

It was done the same way for me. Same masonry, also KfW55

Whereas with me it goes straight down and out of the house, and no pipe runs horizontally along the wall

We have also routed the ventilation through the roof in an exterior wall.

However, 2-layer masonry (aerated concrete + clinker)

But also KFW55!