Which controlled residential ventilation system with Viessmann heating in combination with BAFA?

Hello dear forum community,

after I have now signed the house construction contract with ARGE Haus Berlin, the further planning is now underway.

ARGE Haus installs as heating the Viessmann VITOCAL 200-G with a 300-liter buffer tank (brine heat pump). This is also not changeable.

As controlled residential ventilation, ARGE offers the PLUGGIT Avent P310 for an additional price of approx. €16,000 (including installation, 5-year warranty, etc.).

After I looked at the BAFA information sheet on the funding of the heating system (35%), I had to realize that the Viessmann heating system and the Pluggit controlled residential ventilation cannot interact with each other in terms of control technology (at least not directly). Therefore, funding for the controlled residential ventilation does not seem possible. Or am I mistaken?

A different picture emerges with the Viessmann Vitovent 300-F controlled residential ventilation. This can interact directly with the Viessmann heating system and can therefore be funded with up to 35%.

In various other forums, I had to read that the Viessmann controlled residential ventilation is somewhat louder and unfortunately also more prone to problems. The controlled residential ventilation will be located in the utility room on the ground floor (no basement) in our house.

On the other hand, I have read a lot of good things about the Zehnder Q350 controlled residential ventilation.

As a result, a number of questions arise that I cannot answer without your help:

1. What do you think of the Pluggit Avent P310 and is there a way to have it "interact" with the Viessmann heating system to retain the BAFA subsidy?
2. Is there a way to have the Zehnder Q350 "interact" with the Viessmann heating system?
3. The house construction company advises against the Viessmann controlled residential ventilation because Viessmann builds very good heating systems but not residential ventilation systems. Do you see it the same way?

As an addition: we will not install a KNX system, but will rely on Somfy. Possibly, controlled residential ventilation and heating can also be linked via such an option?

Thank you very much in advance for your help!
Matthias

I don't quite understand what the BAFA means by "regelungstechnisch interagieren" (interact in terms of control). I have the Vitovent 300-F, and there the "regelungstechnisch interagieren" is limited to control via the heating control panel and the app. A controlled residential ventilation system with its own control panel doesn't do anything different either.

Regarding the Vitovent itself, it runs without problems here. When the filters are nearing the end, it also gets a bit louder, I can hear it through the utility room, but it's not disturbing. However, the 300-F has a relatively low maximum volume flow, so I would only use it in "small" houses.

Quote from the BAFA leaflet:

———————————
The control operation common to both concepts can be realized through various approaches, including the following, for example:

1. wired or wireless connection; the devices have a common controller

2. wired or wireless connection; the devices have separate controllers, which are however
control-technically connected

3. connection and control via the evaluation of a sensor

4. a higher-level control, e.g., through energy management / building automation or "Smart Home" systems and the required bus systems
———————————

Regarding the volume flow: our house will have a size of 150 m² on two floors.

Hello Matthias,

2. Is there a way to let the Zehnder Q350 "interact" with the Viessmann heating system?

I am currently facing the same question. We were offered the Vitocal 222-S with a Vitovent 300-F, but I would actually prefer a Zehnder Q350. Both manufacturers have a KNX connection, but the price is already about 1000 EUR for the connection (which should also be eligible for funding). I haven't found an alternative. Even via KNX, there seem to be rejections from BAFA at times; at least there are reports about this in the HTD.

Since Zehnder advertises, among other things, with the funding, I wanted to inquire with their funding service again in the next few days. Maybe you have already done that?

Caution with KNX integration. Viessmann gateway is very limited and can only read. Better to control everything via actuator. With KNX you can combine arbitrarily. Therefore, I would also prefer to use Zehnder, Helios...

I spoke with Zehnder support. They say that the solution with a timer switch and the EVU contact of a heat pump is accepted by BAFA based on their experience. They even sent a wiring diagram showing how to wire it. The timer switch costs about €80, plus the Zehnder Option Box and the electrician’s fees. But if the electrician is already on site (in the new building), then he will probably do it for a small fee; it’s not rocket science. I would personally prefer to implement my own, more flexible solution (openHAB). The electrician just has to approve it, because on some invoice it must be stated that the heat pump and controlled residential ventilation are operated together in terms of control technology, so that BAFA accepts it. If no one can be found who confirms something like that without having implemented it themselves, then it will have to be the solution with the timer switch after all.