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

Ah, §2: Does not apply to you. (if there is only the one granny flat and you live in the other part of the house).

Heating costs read

Not necessary for a basement apartment as the cost outweighs the benefit.

Hello everyone,

I need to reach out here in the forum because I need your opinion and advice.

We (2 adults with 2 small children) have been living for two years in a single-family house with a granny flat (Einliegerwohnung). This apartment has been rented out for one year (2 adults with a baby).
Our house has a geothermal heat pump (Nibe 1245 PC). This provides hot water, heating, and passive cooling through the floor.

The main meter shows 18,000 kWh.
That seems extremely high to me and I can't explain where that could be coming from?!

Could the meter from the energy supplier be defective?
Could a device, e.g. the heat pump, refrigerator, stove, etc., be defective, causing it to consume more electricity?

I am somehow still at a loss.

Many greetings

18k kWh for 2 families over 2 years is not unusual depending on heating and usage behavior.

The problem is more that many people come from 2-3 room apartments with less than 100 sqm, previously only had to pay for comfort electricity with under 3000 kWh, and now every little thing is drawn via grid supply (comfort, hot water, heating electricity).

I was also irritated that after 12 months I had 7.5k kWh on the meter, but with all-inclusive plus electric car, XXL fridge, controlled residential ventilation, boiling water tap, heat pump, basement, 22.5 degrees in winter, etc., that's already okay. Without photovoltaics, the additional payment in the first year would have been even higher.

If you or the tenants now prefer it warmer in the bathroom, long baths, baking and cooking to exhaustion, then 18k kWh is nothing.

So, what writes is of course nonsense. Almost everyone with a heat pump knows this. Only those who can't read or have little technical understanding don't. Therefore, good that you ask. You have to set the heat pump properly. That means setting all room thermostats fully on, max flow rate. Then definitely lower the supply temperature. I would bet that the majority of the consumption comes from the hot water preparation. It always has to provide warm water to the granny flat. This is the biggest cost driver for the heat pump. My tip would have been to install a very large instantaneous water heater for the supply of the granny flat and connect it to the household electricity of the granny flat. Always fresh water and still good heat pump settings possible. Maybe that’s still possible. An extra heat pump tariff is hardly ever worth it if you set the heat pump properly. Of course, you can hire someone who comes a few times including travel and hourly wages, or you do it yourself.

So, what writes is of course nonsense. Almost everyone with a heat pump knows that. Only those who cannot read or have little technical understanding do not. Therefore, good that you ask.

So about 90% of heat pump or heating owners. I didn’t say anything else. Although first it must be clarified here whether it is really the heat pump. If household electricity is included, then it would be a very good value of 4500 kWh per housing unit.

So about 90% of heat pump or heating system owners. I didn’t say anything else. However, first it needs to be clarified whether it is really the heat pump. If household electricity is included, then 4500 kWh per housing unit would be a very good value.

I still see it differently, but never mind. Later the OP provided the values of the heat pump. According to that, the annual performance factor is about ~2 if I read correctly. That would of course be terrible.