Manufacturer recommendation air-to-water heat pump + central ventilation system

"Kombi" doesn't matter at all. One provides warm air and the other fresh air. They usually don't communicate with each other either.

They can already communicate with each other depending on the setup. Whether that really makes sense is another matter. In any case, the funding of the [Kontrollierte-Wohnraumlüftung] depends on it in some cases.

Yes, almost all of them speak Modbus. But I meant what you said, that it’s hardly worth anything.

Well, 35% off the controlled residential ventilation costs is not nothing. Technically, you are probably right. Although it would be interesting to calculate what difference it makes to, for example, turn down the ventilation when the pump is running a cycle. Or conversely even turn it up? Because then the outside air in the vicinity would be slightly warmer? That would be a good exercise for aspiring building services engineers.

How are the Vaillant heat pumps in terms of price/performance?

When it runs, everything is fine. But woe betide you if you have a problem, then you’re all alone in the wide open... Unfortunately, that’s exactly how it is for me right now. :rolleyes:

if it runs, everything is fine. But woe to you if you have a problem, then you are all alone in the wide open.... That's unfortunately how it is for me right now. :rolleyes:

Unfortunately, I have heard that now as well... outage in December - technician in March.. despite maintenance contract