Experience with preheating air in controlled residential ventilation?

JFGI :P
In short: gases from the ground. These can accumulate (possibly in basements). The problem is not the gas itself, but when it decays, more dangerous radioactive decay products are produced that can be inhaled through the air. This can increase the risk of lung cancer. The occurrence varies regionally.
Regular ventilation is enough to minimize the risk. Therefore, I see absolutely no danger from a pipe that transports hundreds of cubic meters of air per hour.

Radon is a manufacturer of bicycles...

There have been passive houses for years that followed this concept. Whether it is worthwhile, I do not know.

But I would choose a pipe suitable for ventilation and not a KG pipe for wastewater.

Radon is a manufacturer of bicycles..

But I would choose a pipe suitable for ventilation and not a KG pipe for wastewater.

I really think it’s about the element radon, not one of the many companies with the same name.

Otherwise, definitely use a pipe intended for that purpose, not just the cheapest one available.

I think it really is about the element Radon,...

Oh, come on...

So this topic obviously seems to be basically an option for [Kontrollierte-Wohnraumlüftung]? Does anyone actually have experience with it? We are about to build a single-family house with insulation, gas heating, underfloor heating, and [Kontrollierte-Wohnraumlüftung]. Our building services engineer recommended this variant to us (by the way, he calls it "Sole-Erdreich-Kollektor") for pre-tempering the air. Is it worth it or not? Does it work? I would also be interested to know how many install an electric heating coil in the heat exchanger to preheat the fresh air at low outdoor temperatures. Thanks for the answers. André