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LostWolf schrieb:

ERR is often required to obtain funding.
However, I would also avoid actuators that need power to hold a position.

ERR is always mandatory, thanks to the Energy Saving Regulation. You can try to get an exemption or at least attempt not to install it or disconnect it after construction.

Every actuator requires power in one of the two positions. The ERR-focused plumbing professional tends to use "fail-closed" actuators because their philosophy assumes the valve should be closed and only open when it’s too cold.
However, if you want to carry out hydraulic balancing, this is counterproductive, as it relies on permanently open heating circuits. If someone lacks the courage to remove the actuators in this case, they will waste electricity accordingly.

Daniel-Sp schrieb:

Then you will have to thoroughly deal with the hydraulic balancing and the subsequent thermal balancing. This will save you heat pump electricity afterwards.

Hmm, where is the best place to read up on this topic in detail?

kati1337 schrieb:

Hmm, where is the best place to read up on this topic?

I also read about it here and found the answers/explanations helpful.
https://www.hausbau-forum.de/threads/hydraulischer-abgleich-einzelraumregelung-deaktivieren.36692/

JansEigenheim schrieb:

At least being open without power for the few rooms like the bathroom, where people don’t want cooling in summer, is probably the best option. It’s better to use electricity for cooling those few days than all the rest of the time.

Does this mean that if you want to cool in summer with a brine-to-water heat pump, you do need the ERR? Because I wouldn’t have installed the ERR for heating (the exemption application has been with the authority for two months).

kati1337 schrieb:

Hmm, where is the best place to start reading up on this topic?

better to just skip it

Alessandro schrieb:

better leave it

I think I was just insulted, but I’m not sure.