I would like to start a new comparison thread and learn about your energy consumption. I am not completely satisfied with mine.
KFW55
Heated area 200 m2 (2,150 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 centralized controlled ventilation system
Domestic hot water temperature 50°C (122°F)
Data collection unfortunately only since April 2019:
I will update the table monthly. November will be included soon, with an estimated 650 kWh.
KFW55
Heated area 200 m2 (2,150 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 centralized controlled ventilation system
Domestic hot water temperature 50°C (122°F)
Data collection unfortunately only since April 2019:
| April | 407 |
| May | 347 |
| June | 109 |
| July | 131 |
| August | 144 |
| September | 198 |
| October | 356 |
I will update the table monthly. November will be included soon, with an estimated 650 kWh.
KFW70 semi-detached house
3 stories, 17 windows, large windows facing SSW, large side wall facing WSW
Heated area 146 m² (1,571 ft²), underfloor heating
Standard rooms 22°C (72°F), living room + kitchen 23°C (73°F), bathroom 23°C (73°F)
Exhaust air heat pump Nibe F730
Domestic hot water temperature 45°C (113°F) with a morning boost to 55°C (131°F)
Outdoor temperatures usually about 2 K (3.6°F) lower than those recorded at weather stations
Total: 3344 kWh
3 stories, 17 windows, large windows facing SSW, large side wall facing WSW
Heated area 146 m² (1,571 ft²), underfloor heating
Standard rooms 22°C (72°F), living room + kitchen 23°C (73°F), bathroom 23°C (73°F)
Exhaust air heat pump Nibe F730
Domestic hot water temperature 45°C (113°F) with a morning boost to 55°C (131°F)
Outdoor temperatures usually about 2 K (3.6°F) lower than those recorded at weather stations
| January | 937 |
| February | 483 |
| March | 378 |
| April | 203 |
| May | 108 |
| June | 47 |
| July | 50 |
| August | 39 |
| September | 54 |
| October | 166 |
| November | 388 |
| December | 491 |
Total: 3344 kWh
4lpha0ne schrieb:
Total: 3344 kWhAddendum:Of this, 457 kWh in January were caused by the rapidly activated heating element, as I only began optimizing at that time. Annual coefficient of performance (COP): 3.15
The values set by the builder were predictably not very good. It seemed he had not installed a NIBE system before either. However, we had no influence on that.
Lowest temperatures were approximately as follows:
- KfW55 house standard
- Two full floors without basement, 21 windows, main window orientation WSW (west-southwest)
- Heated area: 160m2 (1722 ft2), underfloor heating with 10cm (4 inches) spacing and activated wall heating in the shower area
- Standard rooms at 20°C (68°F), living room + kitchen + bathroom at 21°C (70°F)
- Brine/water heat pump: Buderus 1.3–11.8 kW modulating
- Domestic hot water temperature: 50°C (122°F) (heated only once daily at peak photovoltaic output or solar noon)
- Mechanical ventilation with heat and moisture recovery: Vallox 350MV-E
| January | 478 |
| February | 310 |
| March | 233 |
| April | 120 |
| May | 85 |
| June | 44 |
| July | 34 |
| August | 36 |
| September | 37 |
| October | 85 |
| November | 170 |
| December | 245 |
Total: 1877 kWh
Good value, but with a payback period of about 30 years compared to an air-to-water heat pump, it is still not financially viable despite subsidies. Therefore, ground-source heat pumps remain something for enthusiasts; we would have liked to install one as well because it is great technology.
Similar topics