Air-water heat pump current consumption and data

That’s what I meant earlier by the strange hot water behavior. At the low outdoor temperatures. The hot water preparation usually looks like the one on the far left.

By the way, that’s what I meant earlier with the strange hot water behavior. At the low outdoor temperatures. The hot water preparation usually looks like the one on the far left

Unfortunately, there is no timeline here. But just the ratio of heat pump runtime to downtime is very impressive. In fact, almost no heat escapes from the house. In my case, the heat pump runs almost continuously at -5 degrees. Sometimes it stops for 3 hours, but then the return temperature drops by 3 degrees and it starts up again...

The interpretation is of course nonsense for a heat pump...

Yeah, I thought so too. But I'm afraid that's a standard, because there were planning offices involved and you can see from the calculations that they are standard values. For example, air-to-water heat pump is checked, etc...

unfortunately, there is no timeline here. But the ratio of heat pump running time to downtime alone is very impressive. Practically no heat escapes from the house. In my case, the heat pump runs almost continuously at -5 degrees. Sometimes it stops for 3 hours, but then the return flow drops by 3 degrees and it starts again...

I think now it can be better classified, also the statement why yesterday’s 22.5 kWh was pure coincidence and it will be more today

The data from the energy certificate are useless; they only inadequately reflect the actual consumption. For example, the energy certificate does not evaluate the quality of the design of the underfloor heating at all.

We only moved in at the end of November, and I am currently trying to reconcile the energy certificate with the actual consumption :) Although it is not a long-term consumption, what I find quite appropriate is the transmission loss of the building envelope compared to the current consumption of the heat pump. We have a total of about 100W/K transmission loss, which at a current delta-T of about 35K results in a heat demand of 3.5KW, i.e., 84KWh per day. The heating coefficient of performance for me is about 5.9, which results in approx. 14KWh electricity consumption per day... and that matches pretty well at the moment.

I ignore the internal gains assumed in the energy certificate, as they roughly compensate for the ventilation losses.

The calculation is obviously straightforward at large delta-T, since I have a modulating heat pump. As soon as the heat demand is less than the lowest modulation stage, my heat pump will cycle... I assume then the above-mentioned trick no longer works. We'll see.

That doesn’t fit, or am I missing something...

I don’t fully understand the question, but for the bathroom there is a heat loss of 912 watts – meaning that of the required 1,612 watts, only 700 come from the underfloor heating. The rest comes from somewhere else ==> you have to tell us what electrical heaters are mounted on the wall.
Completely incomprehensible how such a design can be made when different pipe spacing options are possible. In your case, everywhere 100mm. In the bathroom, 75 or even better 50mm would have been possible.
Also incomprehensible a 35/28 degree design. Why so high with such a large temperature difference?