Return slip filter / Additional option heat pump

Hey,

I had the initial consultation with the plumbing company today.

I was offered to basically upgrade the inclusive "DIN-DVGW approved water filter" to a backwash filter for a cost of 120€ (presumably net).

Is something like this recommended? Is the "normal" one enough? The filter replacement would probably be eliminated, which normally has to be done at intervals with the standard one.

In addition, it was offered to improve something in connection with the heat pump. I just can't remember what it was. Maybe someone knows what is meant Somehow with self-filling and turning two little wheels... and everything very simple and if the customer service comes and takes a sample and detects a contamination, then the service becomes more difficult... if I have remembered all this correctly...

Thanks for feedback!

Backwash filter is indeed recognized rules of technology. What is the exact wording? So what was ordered?

For the heat pump, presumably a salt filter for filling. As far as I know, it has to be filled with Ve water anyway.

Nothing has been ordered yet. Will I still receive an offer?

In any case, a backwash filter would not be included.

So, today I can say exactly what was offered to me:

Backwash filter DN 25, manual with pressure reducer

and for the air-to-water heat pump:

Purotop wall station micro, for topping up the heating system with treated water according to VDI guideline 2035

The backwash filter is clear and should be taken. For the second part/device/whatever, I have zero idea. Is it necessary? What do I get from it during operation or what costs does it entail? This part is offered to me for €270 gross. I would save something in the future. Just don’t remember what anymore... it’s been a while since the plumber explained it to me....

Thanks here too for feedback.

So we have only used the part twice, it is hanging on the wall and will probably be needed for the initial filling of the underfloor heating with about 380 liters of water. And with us, a taco was leaking a little water, causing the pressure in the underfloor heating to drop. Open the valve and refilled. Despite the ve filter, the heating water slightly clouded.