ᐅ ERR, KNX, heat pump, and controlled residential ventilation – what are your thoughts?

It is also possible to get an exemption. Of course, this involves the usual discussions with the authorities...

And the question was whether it makes sense; the answer is very simple. It costs money, no matter how you look at it, and leads to inefficiency without any benefits.

If you don’t want to apply for an exemption... implement a basic setup, then simply release the actuator motors on the heating manifold and disconnect the power, and the problem is solved (legally). Make sure that the installed valves are fail-safe open when unpowered!

Be aware that when using cooling, certain rooms like the bathroom may need to have their heating valves turned off during summer. Otherwise, they will also be cooled, which might not be very comfortable.

I am still just a theoretician, as we have not reached that stage ourselves yet. This information came from the heating installer.

Best regards! mini

mini_g! schrieb:

Be careful, when cooling, some rooms like the bathroom may need to be turned off at the heating circuit distributor in summer. Otherwise, they will be cooled too. That might not be very comfortable.

But I’m still just a theorist myself, we’re not that far yet. This info came from the heating engineer.

Best regards! mini

My experience with this: I leave my wall heating in the bathrooms running cool in summer... because I find a cool bathroom more pleasant in summer.

You’re right about tiled floors... I turn off the underfloor heating in the bathrooms because otherwise, it’s uncomfortable. You can do this in one minute at the heating circuit distributor. Of course, you can also solve this with a control system, but that means having valves connected all year round. It’s possible, but I decided against it.

ERR (Energy Recovery Ventilation) systems do not make much sense, as low-temperature surface heating is far too slow to respond. However, they are still required by regulations. It is possible to apply for an exemption, but success is not guaranteed.
This also clarifies the question of whether ERR systems should or can be integrated into a smart home via KNX.
My principle is that a heating system is smart if it only needs to be set once and then not adjusted until the heating equipment is replaced. Therefore, integrating it into a smart home setup is unnecessary (not considering the playful interest of tech-savvy homeowners). Large temperature differences between rooms within the thermal envelope are generally only possible with extra thick insulation in the interior walls. A 2°C (3.6°F) difference is achievable; 4°C (7.2°F) becomes quite challenging.

As I said, it was more out of necessity.
The whole hassle regarding the exemption was too much effort for us. Primarily, I also suspect that they are required by the BAFA.
Since the KNX switches are already in place, the heating actuator will just be added. The plumber will then fully activate those devices.