Water softening and filling system for heat pump

Hello everyone,

I'm currently annoyed by the SHK trade.
In advance, a brine heat pump with about 6kW output will be used. Of course with underfloor heating.
Regarding the topic of buffer storage, I have already settled that with an SHK company in terms of creating a specification sheet. At the latest after I made it clear that the heat pump will run on household electricity, so there is no blocking time, he gave up the attempt to install a 46-liter buffer storage for the heating. Phew.

However, we are still a bit stuck on softening. Another nice "goodie" that he always installs (and whose costs are not itemized separately). But I also have difficulty finding reliable sources regarding the benefit or even the requirement of such a system. We have 12.3° dH in the building area.
Is a softening system necessary for the heating?

In addition, he wants to install an automatic filling system for heating water. Does that make sense? I imagine the amounts to be refilled are small and doing this manually once a year (how exactly does that work – my current gas heating has a hose, a valve, and that's it) wouldn't be a drama...

I'm a bit stuck here right now.

I assume you are referring to the softening of the water during the initial filling. This is required in VDI 2035 and should also apply to you. In my opinion, a treatment system for refilling would be quite excessive.

I consider the automatic filling system dispensable in single-family house construction. I agree with you on that. Regarding the water softening, see the previous speaker. Please clarify what he means. If necessary, he may be expressing himself unclearly or you may be too distrustful towards him. Karsten

I also think that the water needs to be treated. However, I would have thought that for this one-time process, someone would come by with such a mobile system, fill it up, and then leave again. In the meantime, I have googled, and there are softening cartridge systems for 150-200€, which can reduce 4-6 cubic meters of water to <0.1° dH before they need new resin. Maybe it is something like that. That would still be okay if the costs for using a mobile softening/desalination unit are avoided.

Maybe the filling system is also just for its convenience? No idea.

But thanks to you all already for the feedback.

So, a cartridge fox can also be seen in our utility room. And you can believe me that I only took standard and nothing else. Karsten

We also have a water softening system for our heat pump (unfortunately only for the heating and not the drinking water [emoji51]) It was filled with this system and I can refill it if necessary. It was included in the "heat pump" package with our general contractor...