[kennethh]

What would be the advantage compared to commercial products like: https://les.mitsubishielectric.it/en/products/ventilation_37...

This product cost around 500$ and also has heat exchange. A friend of mine has installed it and is very happy with it.

[open_erv2]

It's better compared to a blauberg vento or lunos e2. That product probably gets poor efficiency, I have not checked the technical sheet but if they say 80% that means at the minimal flow levels, which are only 10 cfm or something. The TW4 gets >85% sensible and comparable latent efficiency, at 60 cfm. It also has twice the maximal flow of that device. It's got many other features as well, and is more durable. Ultimately, it's about return on investment. You have to make a spreadsheet and see which one is best, given the actual tested values for efficiency flow, maintenance cost, etc. If that's not possible, it's a shot in the dark.