ᐅ Heat Pump Energy Consumption in 2019 on a Monthly Basis

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:

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.

Several threads in the house building forum have already shown that such comparisons are not very helpful.

The exact same house: one is located on a south-facing slope in the mild climate of North Rhine-Westphalia with forest behind it, while the other stands in a densely built neighborhood with large trees at the edge of the Alps. This alone can quickly cause a 50% increase in energy consumption. One family uses 150 kWh for domestic hot water, another uses 300...

One KfW55 house has large window areas facing the unshaded south, the other is oriented to the north, and so on and so forth...

Are the provided figures for electricity or heat?

I have since neglected this. But from October 2018 to 2019, we used 4800 kWh.

KfW 70 with central controlled ventilation

About 230 m2 (2475 sq ft) of heated area including the basement

Bathroom set to 24°C (75°F)
Bedroom at 20°C (68°F)
Living room at 22°C (72°F), which quickly heats up to 24°C (75°F) when people are present.

Basement including a granny flat around 19°C (66°F); mother-in-law doesn’t like it warm, my wife always enjoys staying there.
Hot water is set to 45°C (113°F)

But lumpi is right. For example, we live in the Black Forest; last year we had snow on 40 days, and the forest starts just beyond the road. So, I’m satisfied. Maybe we could save a few more kWh, but that would probably come at the expense of comfort.

That’s a great value. It shows that there is no difference in energy consumption whether you have KfW 70, 55, or 40 standards. It depends much more on the heating system settings than on excessive insulation.

Bookstar schrieb:

I would like to start a new comparison thread and learn about your energy consumption. I’m not entirely satisfied with my own numbers.

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 mechanical ventilation with heat recovery
Hot water temperature 50°C (122°F)

Data recording 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, soon November will be included, likely around 650 kWh.

Extrapolated, that will be around 4,500 kWh. How much do you pay in total? Around €1,350 per year?

Good luck
Ippebson

Bookstar schrieb:

Kfw70 55 or 40. That depends much more on the heating system settings than on insulation fanaticism.

No, it depends on location and consumption behavior, as explained above. Theoretically, a KFW70 house could also be better insulated than a KFW55 house. Your comparison doesn’t really mean much.

By the way, I consume just under 2,500 with a KFW55 house… and what does that tell you?