ᐅ Air-to-Water Heat Pump: Current Consumption and Data

That would be really, really nice 🙂

Bookstar schrieb:

Okay, I am about one third above. Where it comes from? I have no idea. Everything is standardized, the bricks and insulation materials. It can only be due to location, temperatures, etc.....

From March 1, 2020, to March 1, 2021 (including the last somewhat colder winter), I recorded 13,131 kWh (44,724,000 BTU) for heating and 2,934 kWh (10,009,000 BTU) for domestic hot water. However, the second-to-last firmware version had an issue with the heat meter. I will verify that again because the consumption was 2,967 kWh (10,131,000 BTU), and I still have difficulty believing an annual performance factor (COP) of 5.4 for the Nibe F730 (yes, I have optimized a bit too much).

KfW70 semi-detached house with 146 m² (1,571 sq ft) of living space

Something doesn’t quite add up. I have 250 m2 (2,690 sq ft) and only about 800 kWh more. Either your heat meter is showing too much, or you misread something.

tomtom79 schrieb:

Something doesn’t quite add up, I have 250 m² (2691 sq ft) and only about 800 kWh more. Either your heat quantity meter is showing too much or you misread something.

This data comes directly from the heat pump log files (10-second data series). The electricity consumption is from the meter history. But as mentioned, regarding the firmware that was installed from August to March, it says:

The basic configuration of energy flow meter BF1 went wrong in v.9089R9 which meant that the energy measuring was faulty. Corrected.

I will look into that again.

Since this is an exhaust air heat pump, the incoming air (about 800,000–900,000 m³/a (28,254,000–31,799,000 cu ft per year)) must also be heated. And the large gable wall is often exposed to strong winds. Indoor temperature is usually around 22.5°C (72.5°F).

Second night without heating. Everything is fine. Nobody is cold. Here are the temperatures from the ground floor over 24 hours and outside. Inside the ground floor, it is 0.3°C (0.5°F) colder than yesterday at the same time because we dropped below zero outside last night.

Upstairs, the temperature is currently 21.3°C (70.3°F).

I wouldn’t consider those few euros worth it. The slightly warm tiles were already very comfortable this morning in the bathroom. The night was very cold again, with minus 4 degrees Celsius (24.8°F).