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My first thought "hello.. google?" .. but actually only very confused things come up, from places in France to train programs to the Einsatzstab Reichsleiter Rosenberg

Ok what does ERR stand for please?
My ideas were:

[*]Electric Room Air Regulator
[*]Energetic Room Temperature Controller
[*]Voluntary Renaissance Rider
[*]Square Tube Profile Grid

Erotic Travel Raclette?

My first thought was "hello.. google?" .. but actually you only get very confusing stuff, from places in France to train programs and even the Einsatzstab Reichsleiter Rosenberg

Yes, as a graduate in business informatics you can expect that from me, after all, we invented sites like lmgtfy. But with just 3 letters there are probably just too many possibilities to find the right one.

Single room control. The rotary knobs in the rooms for controlling the underfloor heating

Thanks!

Efficiency reduction controller (at least for heat pumps)

Haha - okay, good to know
But if you don’t use them (we also have a heat pump), then you somehow have to be satisfied with the same temperature throughout the whole house, right?
If I turn them all up to the max, it’s either too hot in the bedroom or too cold in the bathroom. Not to mention the utility room and the storage room. My noodles don’t need a cozy living room climate.

Erotic rice raclette?

I knew it couldn’t be that. Several people said they were ineffective/useless. It’s obvious that doesn’t apply to erotic rice raclette.

But if you don't use them (we also have a heat pump), then you somehow have to be satisfied with the same temperature throughout the whole house, right? So if I turn them all up to the max, either the bedroom is too hot or the bathroom too cold. Not to mention the utility room and the storage room. My pasta doesn't need a cozy living room climate.

Then you will have to intensively deal with the hydraulic and then the following thermal balancing again. Then you will save heat pump electricity afterwards.

My noodles don’t need a cozy living room climate.

Then I recommend you design the heating loop spacing "regulation" so that the pantry is completely skipped during installation.

ERR is often mandatory to receive funding. However, I would also not use actuators that actively require electricity to maintain a position.

ERR is always mandatory. Thanks to the Energy Saving Ordinance. One can get an exemption or at least try, simply not install it or disconnect it after installation.

Every actuator requires electricity in one of the two positions. The ERR-believing sanitary technician tends to install "fail-closed" actuators because, in their philosophy, the valve is normally closed and only opens when it is too cold. But if you want to practice thermal balancing, that is counterproductive, as it is based on permanently open heating circuits. Anyone who then lacks the nerve to dismantle the actuators accordingly wastes electricity.