Hello Thorsten,
these are impressive values. If that's true, then I could assume about 8500 kWh for 200m² of heated living space.
Hard to believe With your values, any discussion about air-to-water heat pumps becomes pointless.
Hello Stefan,
that's not so impressive at all. Although the values are okay and a reason to be happy.
A friend of mine has a similar house to mine (same manufacturer, very similar size, but with a basement, we both have KFW-70 standard and the houses range in values between 70 and 55).
The two are not as cold-sensitive as I am and had even slightly lower consumption in 15/16, although the winters in AB are certainly harsher than here in Velbert.
I think with 8.5T kWh you are not that far off for 200 sqm living space. That would be 42 kWh/sqm/year (heating energy consumption, not primary energy consumption). Anyway: The heating / hot water doesn’t make you poor. Taxes, garbage etc. are much more expensive.
In my house, the air-to-water heat pump currently makes no sense, because as I said, I chose radiators (because my wife and I don’t like underfloor heating). I would have to run the heat pump with too high a flow temperature, which severely affects efficiency. Of course, too high a flow temperature at ground source affects the coefficient of performance, which is why I drastically lowered the flow temperature, and the aforementioned builder even runs 5-7 degrees lower. We don't freeze doing so. The principle is: properly adjusted heating curve and running the heating continuously, no setback. Basically like underfloor heating, just with 15-17 degrees more flow temperature.
Let's see what happens in about 10 years with energy prices. Why 10 years? Well – that’s roughly the lifetime of a gas boiler in prognosis. Some last 8. Others 14-15. Then one can see what is on the market by then.
Personally, I am glad to have a gas connection in the house. Also for new technologies that will come, it will certainly be usable. I would also have enough electricity – photovoltaic, so I do not generally exclude an air-to-water heat pump (with better values at high flow temperature in 10 years) as a replacement.
Best regards
Thorsten