Proper Setup of an Integral Air-to-Water Heat Pump for Beginners

Hello everyone,

We moved into our KfW 40 new building in May. Now it’s getting colder and I would like to turn on the heating. We have an air-to-water heat pump as an indoor unit with an integrated ventilation system, and so far only the hot water operation and ventilation have been running. (Our consumption after 5 months is 3100 kWh.) Specifically, it is the Tecalor THZ 5.5 eco. We have about 140 sqm of living space over 3 floors and underfloor heating.
Just upfront, I have no idea about heating settings and I’m trying very hard to read up on the internet, which is quite difficult.
As far as I understand, all room thermostats should be open and you regulate individual rooms elsewhere down. But why? What exactly does this heating curve and the base point etc. mean...
I would really appreciate it if someone could explain this to me like I’m a dummy or should I leave it to the plumber? He just made some standard settings.
I’ll just note down our values here again. (Oh, some of it is still locked by a code I don’t know).

Heating settings
Room temperature HK1 and HK2 (the plumber doesn’t know which heating circuit is which, I think)
RT day 20.5°C
RT night 17.5°C
RT standby 10.0°C
Heating circuit set manual 35.0°C

Heating curve HK1 and HK2
Slope 0.20
Base point 1.0°C
Room influence 0
Proportion flow 30%
Target value max 55.0°C
Target value min 10.0°C

Basic settings
Prop. portion 2.0%/K
Integral portion INV 500
Max NE level HZ 03
Max flow temperature HZ 60.0°C
Summer operation 17.0°C
Hyst. summer operation 4.0 K
Damping outside temperature 12 h
Bivalence point -10.0°C
Time lock NE 20min
Correction AT 0.0°C
Suppression T measurement 60 sec
Temperature design heating -20.0°C
Power design heating 100%

Should I also specify hot water and ventilation?

I will not go into the settings now. That would be the 1,001st thread on the internet dealing with the basic settings of the Tecalor/ LWZ. Try searching in the search engine for Stiebel Eltron LWZ. It is actually identical to the THZ, and you will find more information there. Then read further. It’s worth it, considering your consumption. In the KFW 55 we need just a little more than half for the whole year, heating AND hot water/ controlled residential ventilation.

3500kWh over the summer months for only [WW] is already an unusually high amount, something is massively misconfigured if that is really supposed to be just the normal heating/[WW]. However, I would be interested to know how one can consume less than 2000kWh for heating and [WW] over the whole year.

How one can consume less than 2000kWh for heating and hot water throughout the whole year would interest me.

Energetically good new building or suitably renovated old building in a not too large house. I also easily stay below 2,000kWh.

+ decently operated heat pump. The internet is full of people who manage that. These are the ones who have dealt with it.

Our consumption after 5 months is 3100 kWh

Are you sure that this is the (electricity) energy consumption? I rather suspect it is the thermal energy production. Otherwise, something would really be wrong with you.

Since April, we have had about 450 kWh energy consumption, but around 1600 kWh thermal energy production (heating + domestic hot water).
In the last 12 months, just under 100,000 kWh energy production and 2650 consumption. Officially a KfW 70 house.
But we also heat to 22°C room temperature (yes, everyone here is sensitive to the cold), so I am quite satisfied.