ᐅ Air-to-water heat pump Rotex HPSU Compact 516 – user experiences

Good morning everyone, we will start building in January with Town & Country (HIS) in Brandenburg. We will be installing a Rotex HPSU Compact 516 air-to-water heat pump. Has anyone here already had experience with this unit? How much does your machine consume? Could you please share some information?

Is there anything we should consider before starting construction? Is it possible to add anything extra?

Our house:
Flair Duo 180m² (1937ft²) (with a granny flat)
Underfloor heating

The device is nothing special—just search the internet. Energy consumption mainly depends on your insulation, ventilation, and especially the design of the underfloor heating system. There are already thousands of posts on this topic both online and in this forum.

Is there already a room-by-room heating load calculation? Have you set your desired temperatures for each room? The supply temperature should not exceed 30 degrees Celsius (86°F), and there should be no buffer tank in the heating circuit. Have you already determined the size of the hot water storage tank?

With all this data, the size of the heat pump can be determined. It is important not to oversize the heat pump; it should closely match your actual consumption. This way, you will have an efficiently operating heat pump.

From what I have seen, the best advice is to get involved yourself in the planning process and not just let the heating engineer improvise.

Hey, thank you very much for your response.
We haven’t done anything yet. The heating load was calculated by the company.
Since we have little knowledge about this topic, I thought I could get some help here. Thanks in advance.

If I checked correctly on Rotex, the smallest model has 11 kW. In my opinion, that’s too much for the size of the house.

Have you had the heating load calculation in hand, or did the installer just say it was done? You wouldn’t be the first case where there isn’t one.

No, I didn’t have control over it; I was just told about it.