Individual room control with air-water heat pump and underfloor heating

Hello,

more of a general question than linked to a specific construction project.
I am increasingly hearing among acquaintances that heating engineers/general contractors like to provide ERR when heating with an air-to-water heat pump.
We have also already received such an offer.

However, it seems like the entire internet is of the opinion that an ERR is not only pointless but even counterproductive.
I can hardly judge that, but the reasons sound plausible.

1) In solid construction, after a certain time, everything inside the thermal envelope is anyway heated to more or less the same temperature. So it is pointless to switch off the heating in rooms that are rarely used because they are heated through the other rooms.
2) The entire masonry, screed, etc., makes the heating behavior very sluggish, and the low flow temperatures do not allow targeted "boosts." Therefore, it is more sensible to simply run the entire underfloor heating constantly and operate the heat pump in the "comfort zone" with the lowest possible flow temperature.
3) as in 2): an increase of room temperature at the thermostat by 2° takes many hours to become noticeable due to the sluggish system. So if it is too cold for me in the evening, it doesn’t help to turn the thermostat.

Well, I am not an expert, but that sounds plausible.
Is an ERR really counterproductive and should be avoided in solid construction with an air-to-water heat pump?

Have some installed, they are required by the Energy Saving Ordinance. Make sure you can set the "manually off" position. Once you have moved in, set them all to "manually on" and never pay attention to the rotary knobs on your wall again.

And you spoil your rooms with small dust catchers on the wall. I would leave them out and let myself be free.

In connection with "smart" home systems such as KNX, I would not want to do without it! Even if you want to "cool" with underfloor heating, it can be quite useful with ERR.

In connection with "Smart" Home systems like KNX, I would not want to do without it!
Even if you want to "cool" with underfloor heating, ERR can certainly make sense.

I do not understand how the presence of a KNX installation influences the decision whether an ERR is generally useful. It is just another way to control it.

When it comes to a cooling function, the situation may look different. In that case, an ERR can certainly make sense (whether with or without KNX does not matter at first).

I don't understand how the presence of a KNX installation influences the decision whether an ERR is fundamentally sensible. It's just another way to control it.

I didn't specifically limit it to KNX. I just wanted to distinguish between proper measurement and control technology and the bimetal treasure meters that most people have installed. With proper measurement and control technology, you can counteract overheating of individual rooms more precisely. For example, with solar gains, running equipment, etc., sometimes predictions can even be used here. Logging is also very practical. This allows you to evaluate very precisely in which room the valve was closed how often. This then makes it very easy to optimize the thermal balancing.