Hello and good morning to the forum! After reading along for a long time, I’ve decided to register because I’d like to ask about the collective knowledge here 🙂. A brief introduction about me/us: we moved into our house (prefabricated, timber frame construction) in 2023. So far, the building services (Viessmann split heat pump and Zehnder Comfoair E 350) have been running well through the winter, but like many others, we have a problem with too low relative humidity. An inquiry with Zehnder revealed that replacing the standard heat exchanger with the appropriate enthalpy exchanger (we were given the article number) is possible. Now to my question:
Has anyone done this with this ventilation system? I’ve only found guides for the Comfoair Q350 model.
I also have a quote from a technician, which comes to about 1750 euros (including 2 hours of installation and the exchanger). That seems quite high to me. I’ve already found out that the part itself costs around 1000 euros 😉 but the installation didn’t seem too complicated.
Before we start experimenting, I’d rather ask here first.
And if anyone has done this themselves, it would be great if you could share your experience — was there a noticeable improvement? One more thing I’m concerned about: the E350 has no pre-heating coil. The heat exchanger by Zehnder is only described for use down to -6°C (21°F) outside temperature. What happens if it gets colder? Do you have to switch off the ventilation to prevent damage?
Thanks in advance for reading, I’d be happy if anyone can share any insights. Good luck Bubo
Has anyone done this with this ventilation system? I’ve only found guides for the Comfoair Q350 model.
I also have a quote from a technician, which comes to about 1750 euros (including 2 hours of installation and the exchanger). That seems quite high to me. I’ve already found out that the part itself costs around 1000 euros 😉 but the installation didn’t seem too complicated.
Before we start experimenting, I’d rather ask here first.
And if anyone has done this themselves, it would be great if you could share your experience — was there a noticeable improvement? One more thing I’m concerned about: the E350 has no pre-heating coil. The heat exchanger by Zehnder is only described for use down to -6°C (21°F) outside temperature. What happens if it gets colder? Do you have to switch off the ventilation to prevent damage?
Thanks in advance for reading, I’d be happy if anyone can share any insights. Good luck Bubo
Had the same problem... although with a Helios system, but the principle is similar.
Open the flap, loosen one screw, take out the old heat exchanger, put in the new one, screw it back in. Close the flap. Done. Don’t forget to turn on the suction ;-)
Warranty or not, 750 euros for the installation is a rip-off.
The humidity is now noticeably better, the 1,000 euros were definitely worth it for us!
Open the flap, loosen one screw, take out the old heat exchanger, put in the new one, screw it back in. Close the flap. Done. Don’t forget to turn on the suction ;-)
Warranty or not, 750 euros for the installation is a rip-off.
The humidity is now noticeably better, the 1,000 euros were definitely worth it for us!
Zaba123 schrieb:
..make sure to reinstall the old unit if the main device breaks down unexpectedly before the technician arrives, so as not to jeopardize the warranty.Good tip, we will keep that in mind 😉Similar topics