ᐅ Heat Pump Energy Consumption in 2019 on a Monthly Basis

At least today I finally set the hysteresis so that it doesn’t heat hot water seven times a day... until now, I’ve probably wasted several thousand on electricity for nothing. Many thanks to my "heating service company."

In my first year, I used 3,350 kWh for hot water and heating.
200 m² (2,150 ft²) of living space, no stove, no mechanical ventilation with heat recovery, narrowly missed KfW 50 standard. 9 kW air-to-water heat pump, non-modulating. All energy recovery systems turned off. Region: Lower Franconia.

Your hot water consumption seems quite high to me. Do you have a circulation system? Otherwise, your heating also seems to have turned off quite late and started again rather early in October. I set my heating threshold to 12°C (54°F) daily average and never felt cold.

Bookstar schrieb:

I would like to start a new comparison thread and learn about your energy consumption. I’m not completely satisfied with mine.

KFW55
heated area 200 m2 (2,153 sq ft), underfloor heating
Standard rooms 19°C (66°F), living areas 22°C (72°F), bathroom 23°C (73°F)
Air-to-water heat pump with central controlled mechanical ventilation with heat recovery
Domestic hot water temperature 50°C (122°F)

Data collection unfortunately only since April 2019

A 4°C (7°F) temperature difference in a new build? Either your energy recovery ventilator (ERV) is cycling excessively and killing the efficiency of your heat pump, or you have some rooms turned off and need to run high supply temperatures because the bathroom and living areas are indirectly heating the other rooms. This is also a major efficiency killer.

michert schrieb:

4-degree temperature difference in a new building? Either your radiator thermostatic valves (TRVs) are adjusting constantly and killing your pump’s efficiency, or you have some rooms turned off and need to run high flow temperatures because the bathroom and living areas are automatically heating the other rooms. This is also an efficiency killer.

The TRVs in the unused rooms are set to 2-3 and in the living areas to 5. Could this be the reason for the inefficient operation?

Be careful: this comparison is between ground source heat pumps and air-to-water heat pumps. Ground source heat pumps have a much better annual performance factor but are also significantly more expensive due to the drilling required.

Bookstar schrieb:

So, the air change rates (ACH) are set to 2–3 in unused rooms and 5 in living areas. Could this be the reason for the inefficient operation?

Turn everything up and lower the heat pump output until you start feeling cold.