ᐅ Determine the electricity consumption of the air-to-water heat pump as a proportion of the total power consumption.

Tx-25 schrieb:

How can I calculate the energy consumption of the air-to-water heat pump from the costs?

Without a separate meter that measures the heat pump’s consumption, or the system’s own data, it’s not possible. Check the settings; there should be a menu option for consumption somewhere.

For the future, you can simply have a standard meter installed additionally in the system.

RotorMotor schrieb:

Often, you can also check the consumption on the heat pump.

You can. But the figures are often quite inaccurate since the devices usually round to 100W. So, for example, a consumption of 351 watts might be recorded as 400 watts. It’s also unclear what exactly is being measured—compressor? Pump? How precisely is the measurement done?

If you allow for about +/- 20% tolerance on the internal meter, the values are roughly acceptable.

RotorMotor schrieb:

It’s difficult to guess what the second electricity meter is for. It’s probably not for the heat pump since too much heat was generated for that. Where exactly are the heat meters installed? One on the heating system and one on the hot water? Is there a separate apartment?

Overall, the consumption seems rather high. What kind of house and heat pump do you have? Often you can also check the consumption directly on the heat pump.

We have an Elco Aero Split 07 heat pump. Yes, as far as I can tell, the heat meters are disconnected: one for the hot water and one for the heating system.

We live in a new build where we have been living for 1.5 years. The values (except for electricity) therefore represent 1.5 years. There is no separate apartment.

Benutzer200 schrieb:

It’s possible. But the numbers are often not accurate because devices usually round to 100W. So, for example, a consumption of 351 watts might be recorded as 400 watts. Also, it’s unclear exactly what is being measured. Compressor? Pump? How exactly is it measured?

If you assume a tolerance of about +/- 20% on the internal meter, it roughly fits.

Which meter do you mean? The separate meter in the distribution box?

I just found consumption data. However, they don’t match up.

Retroactively for the last 4 months:

Hot water 09-12/21: 36/54/53/69 kWh
Heating 09-12/21: 0/83/178/290 kWh

For one year:
Hot water: 69 kWh
Heating: 331 kWh

We probably need to start at “square one” here…

So we are talking about 2021, not 2020. (The house has only existed for 1.5 years.)

The 7 kW heat pump is now known as well.
It would be helpful to have the reported heat quantities and all relevant meter readings, each with the correct units.

Information about the house (150 m² (1,615 sq ft) … 300 m² (3,229 sq ft), KfW program or similar, with or without heated basement, number and age of occupants, location, room temperature(s), etc.) would also be useful to help estimate consumption.
The heat pump probably has one or more meters integrated as well.

With an annual demand of 6,800 kWh, I would guess about 4,000 kWh heat pump consumption and 2,800 kWh household electricity.
But let’s wait for the additional data…