Single-family house - 18,000 kWh in two years - what could be the problem?

I know I understood it, that's why I want to call an electrician who should separate both apartments and then apply for a second meter. It was just calculated and that would be okay so far. But 45000k heat quantity is a lot, I haven't had that even after 5 years and I have 250m2 Okay, let's summarize How big are the heated areas. How warm is the hot water set? How big is the hot water buffer? How high is the flow temperature?

With the 45,000k, the drying heating and even the first winter completely with electric auxiliary heating were included. The problem back then was that no one felt responsible to start the normal "brine operation". Oh, what a hassle that was... Regarding your questions... Heated areas... just recalculated quickly Granny flat: 68 m² Our living unit: 140 m² Hot water was all the time: Start 46°C Stop 50°C But has now been changed to: Start 42°C Stop 46°C Domestic hot water tank 180L Regarding the flow temperature, I don't know where to read it off right now. The service info states: Domestic hot water preparation BT6: 47.1 °C Domestic hot water top BT7: 51.4 °C Calculated flow temperature 1: 20°C

So I'll write down everything I could read from the ServiceInfo:

1/16 Status EB100
Priority control: Cooling
Domestic hot water preparation BT6: 47.1 °C
Domestic hot water top BT7: 51.4 °C
Calculated flow temperature: 20 °C
Degree minutes: 0
Outside temperature BT1: 30.2 °C
Coolant in BT10: 17.1 °C
Coolant out BT11): 19.7 °C

2/16 Climate control system 1 EB100
Flow temperature 1 BT2: 20.3 °C
Return temperature 1 BT3: 22.3 °C
Calculated flow temperature 1: 20 °C
Room temperature BT50: -
External flow temperature BT25: -
Degree minutes 0
External adjustment: No
Floor drying: off

3/16 EB100
Average outside temperature: 27.7 °C
Hot gas BT14: 47.6 °C
Liquid line BT15: 19.6 °C
Suction gas BT17: 35.7 °C
Coolant out BT11: 19.7 °C
Condensate flow BT12 19.5 °C
Flow temperature BT2: 20.3 °C
Return temperature BT3: 22.3 °C

4/16 EB100
Pump speed heat carrier GP1: 100%
Speed of WQ pump GP2: 75%

5/16 EB100
Status internal ZH: blocked
Max. set current flow: 2 kW
Fuse size: 25A
Current L1: 0 A
Current L2: 0 A
Current L3: 0 A
Degree minutes: 0

6/16 Time control EB100
Domestic hot water: off
Heating: off
Cooling: off
Ventilation: active
Schema blocking: off
Holiday setting: off
SG Ready: not used

7/16 Soft inputs/outputs EB100-AA3
AUX1: Tarif blocking (0)
AUX2: not used
AUX3: not used
AUX4: not used
AUX5: not used
X7: DW circulation (0)

8/16 Heat meter BF1 EB100
Heating, compressor only: 28,642 kWh
DHW, compressor only: 7,045 kWh
Heat, incl. int. auxiliary heating: 45,637 kWh
DHW, incl. int. auxiliary heating: 7,873 kWh
BF1: 18.4 l/min

9/16 Integrated passive cooling EQ1
External blocking: No
Calculated flow temperature: 20.0 °C
Cooling/heating sensor BT74: - °C

10/16 FLM AZ1
FLM pump: off
Collector in BT26: 16.4 °C
Collector out BT27: 19.3 °C
Exhaust air BT20: 26.9 °C
Outside air BT21: 18.8 °C
Cooling: off
Version: 9

11/16 FLM AZ2
FLM pump: off
Collector in BT26: 22.3 °C
Collector out BT27: 26.2 °C
Exhaust air BT20: 27.3 °C
Outside air BT21: 26.1 °C
Cooling: off
Version: 9

15/6 Config EB100
Compressor: Bristol 10 kW
Inc. power: 3x 400V
Int. add: 7/9 kW
Heat med. pump: Grundfos UPM2 25-70
Brine pump: Grundfos UPMXL Geo 25-105
Flow sensor: Huba DN20
El. anode: Magnotex
Display type: 0

COMPRESSOR INFO
Master
Status: off
Number of starts: 11,710
Total operating time: 3,353 h
- thereof domestic hot water: 908 h

AUXILIARY HEATING INFO
Status: blocked
Time factor: 2,243
- thereof domestic hot water: 105.9

PRIORITY CONTROL:
Domestic hot water: 30 min
Heating: 30 min

DEGREE MINUTE SETTING:
Current value: 0 GM
Compressor start: -80 GM
Start difference auxiliary heating: 100 GM
Difference between AH stages: 50 GM

MAX DIFFERENCE Flow temperature:
Max. difference compressor: 10 °C
Max. difference auxiliary heating: 7 °C

Is anything missing?
Let me know, I'd rather give you everything you need

10/16 FLM AZ1
FLM pump: off
Collector inlet BT26: 16.4 °C
Collector outlet BT27: 19.3 °C
Exhaust air BT20: 26.9 °C
Supply air BT21: 18.8 °C
Cooling: off
Version: 9

11/16 FLM AZ2
FLM pump: off
Collector inlet BT26: 22.3 °C
Collector outlet BT27: 26.2 °C
Exhaust air BT20: 27.3 °C
Supply air BT21: 26.1 °C
Cooling: off
Version: 9

What seems a bit strange here is that device 1 has a large difference (8 °C) between exhaust air and supply air. As I understand it, a significant amount of heat is being extracted from the warm exhaust air. But why is this not the case with FLM 2? There, the supply air is only 1 °C cooler than the exhaust air?

Okay, a lot is going wrong.

You should have repeated the additional costs due to the heating element.

I see 11,000 compressor starts, that's bad, very bad.

How high are the hysteresis values for hot water and heating?

Is that really a 10kW heater?

Have you adjusted your underfloor heating?

You need a different forum here, I am not allowed to write the name, otherwise I will get banned.

Okay, a lot is going wrong here.

You should have demanded the additional costs for the heating element back.

I see 11,000 compressor starts—that's bad, very bad.

How high is the hysteresis for hot water and heating?

Is that really a 10 kW heater?

Have you set your underfloor heating?

You need a different forum here; I’m not allowed to write the name or I’ll get banned.

Well, it's already very good that a lot is going badly. Then it can only get better. So the designation is F1245-10 PC. I think the 10 stands for 10 kW.

What do you mean by "set underfloor heating"? In my unit, I don't have thermostats; ELF does.

But currently, the underfloor heating is in cooling mode.
: sun-d(at)gmx.net

What seems a bit strange here. Device 1 has a large difference (8 °C) between exhaust air and discharge air. As I understand it, a lot of heat is extracted from the warm exhaust air.
But why is this not the case with FLM 2? There, the discharge air is only 1°C cooler than the exhaust air?

Ok, it looks like I hadn’t turned on the circulation pump of one FLM.
Let’s see if the data changes now.