Heat pump for new single-family house efficiency house 55

That is clear to me. But in new buildings, I don't need a heat pump that is tuned to 55 degrees flow temperature - specifically for old buildings/renovations. A "normal" heat pump is enough for me. Personally, I also like monoblocks and have already installed two of them myself. Otherwise, see [ATTACH alt="waermepumpe-fuer-neubau-einfamilienhaus-effizienzhaus-55-642151-1.png"]82043[/ATTACH]

They also come in small sizes. I don't understand why they market them that way. For example, a 3.5kW air-to-water heat pump makes no sense at all in an old building yet is still marketed under old buildings.

So as long as it is a maximum of 7 kW, it works quite well. However, I would have a big question mark regarding the heating load. According to calculations, the 5kW version would have been sufficient for our KFW 55 house with 200 sqm of heated space - which, however, would no longer have been subsidized by Bafa.

Hello everyone,

so the whole topic is already a bit older, but the house construction company has finally provided us with the heating load calculation. The company now recommends the Vaillant Arotherm Split VWL 75/5 AS. Do you think this is sufficient, or do you see any major flaws in the calculation or the selection?

Somehow I can’t upload the file (it says the file has an unauthorized extension). I hope it works via the link.

Thanks a lot

Hello everyone,

I have now taken screenshots of each page.

Regards ToBu1991

Is no ventilation installed at all?
Why split and not plus?
Do the room temperatures in the calculation match your wishes?
If yes, you should take a 55.

Is no ventilation being installed at all?
Why Split and not Plus?
Do the room temperatures in the calculation match your wishes?
If yes, you should take a 55.

Hello RotorMotor,

No, ventilation is not planned.
The Split was chosen based on previous posts in this thread. The Plus is probably intended more for modernization due to the higher supply temperature.
After reviewing, I would consider the temperatures in the living rooms to be 21 degrees rather than 20. Unfortunately, no one asked us about this.

According to your statement that the 55 should be sufficient, the 75 with the higher temperatures should fit, right?

Regards, ToBu1991

No ventilation is planned.

That's a pity.

The split was chosen based on the previous posts in this thread. The Plus is probably intended more for modernization due to the higher flow temperature.

You seem to have misunderstood something.
From my point of view, the Plus is simply the more modern and better device.
Better/more modern refrigerant, more efficient, later more flexible when the device needs to be replaced, etc.

After reviewing, I would consider the temperatures in the living rooms to be rather 21 than 20 degrees. Unfortunately, no one asked us about this here.

It's a pity that no one asked or you didn't bring this up.
But one degree more doesn’t make much of a difference.

According to your statement that the 55 should be sufficient, the 75 with the higher temperatures should fit, right?

You would have to calculate again. But I strongly assume that the 75 is still clearly too big and will short-cycle.
With proper planning and design of the hydraulics, I would still recommend the 55.