Air-water heat pump current consumption and data

Just checked, in November it was 391 kWh, so a good 13 kWh per day for the entire system. Room temperature 22-23°, KWF55, 218 m2 heated area.

For me, it was 373 kWh electricity with 1727 kWh heat output (MAZ 4.6). We have relatively similar houses and – as far as I remember – the same heat pump. Therefore always a good comparison.

I am already very relieved that with the 1796kWh of heat from 413kWh of electricity I am more or less within range. The first full month in the house and it was also quite cold right away.

It is very confusing when you have 1000kWh of electricity on the meter for just one month. Even more confusing when you are shown in black and white that driving the car around a bit consumes almost as much energy as keeping a house comfortably warm for the whole month.

So, November is over. Consumption was 342kWh including hot water. 128sqm + basement. (Basement unheated) AT in November averaged 5°C Bathroom 22.5°C, all other rooms 21-22°C

With my settings, overloading the buffer by 5K, active mixer (heating curve 5K below heating curve for buffer charging), I come to about 700kWh for November (200 sqm, designed according to energy saving regulations). Temperatures are 22°C, bathroom 23.5°C. Average runtimes about 3 hours with active ERR.

Through the mixer I found out (because I can determine the flow temperature exactly here) which heating curve the house needs and that is exactly 33°C at NAT.

Heating curves were (return flow):

Heat pump:
27°C at 18°
32°C at 0°
35°C at -15°

Mixer:
22°C at 18°
27°C at 0°
30°C at -15°

Hysteresis (heat pump):
5K at 18°
4K at -15°

Since the buffer construction (or the buffer itself) causes a dT from heat pump flow to underfloor heating flow of about 2K, I have now tried to lower the heat pump’s heating curve by 3K and reduce the hysteresis to 2K with the ERR open (here the heat pump flow rate = underfloor heating flow rate).

In the ground floor the temperatures are exactly as I want them.
In the bathroom and the guest room, however, they have each dropped to 21°C.

I don’t understand why? Do I have a thinking error?

Oh, I forgot to write Energy Standard is the Energy Saving Ordinance 2016

November 300kWh electricity including hot water. However, without control and circulation pump. So maybe another 15kWh on top. Single-family house approx. 140 sqm + 73 sqm basement currently unheated but within thermal envelope. Not Kfw standard, insulation value slightly better than energy saving ordinance.