Cross-counterflow heat exchanger with condensate drainage

Hello everyone,

we have bought a terraced house built to Kfw70 standard, which is currently under construction. Now we have the choice between a cross-counterflow heat exchanger with condensate drainage or an enthalpy heat exchanger. (von Wolf)

The enthalpy heat exchanger costs an additional 1600 euros, as instead of the Wolf CWL-300 the CWL-400 Excellent would be installed.
Now we have heard that for moisture reasons the enthalpy heat exchanger would be better, but there is a risk of bacterial contamination.

What to do? The installer says: "no problem at all."
Thanks for your expert help!
Regards
Martin

So... my heating engineer said that in the past there were regularly problems especially in winter with air that was too dry in ventilation systems. This had led to numerous indoor fountains and water vaporizers being set up, alternatively to many conversions of the heat exchanger. Nowadays he installs ventilation systems almost exclusively with enthalpy exchangers, and has had no trouble since then. Regards I.

Aha, very interesting... then I wonder what this thing is for:

I asked my neighbor: It is a typo in the offer, instead of "400" Excellent the "300" Excellent will be installed. But that does not answer my question whether the enthalpy heat exchanger contributes to bacterial growth and whether we will soon install a humidifier with the cross-counterflow heat exchanger. What do you think?

Yes and yes...there is simply no [eierlegende Wollmilchsau]

Hello Mycraft, does that mean you have experience with enthalpy heat exchangers and bacteria formation? Regards, Martin