Calculation of electricity consumption from heating demand

Hi,

maybe someone can give me a hint.
If I know the heat demand of my house, how can I roughly estimate the expected annual electricity consumption from that?

My heat demand is simplified 10 kW (including hot water). What other values do I need to determine the electricity consumption? It should also be mentioned that I want to generate the heat with an air-to-water heat pump (monovalent).

I keep coming across the full load hours (usually specified as 2,000h flat rate) and the annual performance factor (Jahresarbeitszahl) of a heat pump. Is that all there is to it?

10 kW * 2,000h = 20,000 kWh (heat quantity).
20,000 kWh / 2.8 (annual performance factor) = 7,143 kWh electricity used. Is that it? I know that a detailed calculation looks much more complicated (transmission losses, etc.). A rough calculation would suffice. But I think I am missing something here and also find the 2,000 full load hours too generic.

Looking forward to feedback.

Heating load for a modern house is rather 5kW, the heating hours 1800, and the annual performance factor of a heat pump rather 4-5, Ergo 5*1800/4.5=2000kWh *25 cents/kWh = 500€ heating costs

Thanks already. Ok, the invoice was correct otherwise. The 1800 is fixed? It does not vary depending on location / altitude or can it be used as an approximation for all of Germany?

It's of course quite general, as it depends on many factors, but as a rough estimate, it's about right.

Whereas the assumed annual performance factor in practical operation seems quite high to me. I would rather calculate with 3-3.5.

So if an air-water heat pump is planned in the new building and it does not achieve an annual performance factor of 4, either the device is bad, the settings are crap, or the entire system was planned incorrectly. 4 is realistic