Experience annual billing KfW70 house, high energy efficiency

The Zehnder comfoair 350

The Zehnder Comfoair 350

Excellent unit!!!

Really? Then why didn’t you take them?

Really? Then why didn’t you take it?

The Pluggit was included in my "technology package."

It has similar values to the Zehnder, is similarly compact, but generally does not have a summer bypass. You could retrofit one – but as I know from another builder, it’s not worth it. I just turn off the device in summer. We ventilate that way.

The systems aren’t very different. If I had been free to choose, it would have been the Zehnder. But since they also didn’t install any Class-B stuff for us, it was fine for me.

I am very satisfied with the system. It does what it’s supposed to do excellently.

Best regards
Thorsten

Does the Zehnder (always) have a bypass? I haven't dealt with the thing much yet, as there are other urgent "remaining tasks"...

Yes. Quote from the datasheet:

Bypass

Zehnder ComfoAir 350

On summer nights and during transitional seasons with strong sunlight, it often gets too warm inside the house while the outside air is pleasantly cool. In this case, heat removal is achieved through so-called "free cooling": the cooler outside air is introduced into the living spaces bypassing the heat recovery. The ComfoAir 350 is equipped with an automatically switching bypass for this purpose. The bypass is part of the standard equipment and directs the exhaust air flow 100% past the heat exchanger.