Good, if you say so. I myself do not (yet) have any in use and have only read practical studies about it. They were significantly below what is stated in the datasheet.
Ok. The data were also only exemplary. I was primarily interested in the calculation method. So the 1,800 hours are used regardless of what kind of heat pump is used to generate the heat. If the 1,800 hours are roughly estimated, what data would be needed if you wanted it to be more precise?
So if you want to do it properly, you need a heating load calculation. As a layperson, you can also do this on the internet with the u-value calculator, provided the components are known. In my case, it matched quite well, I have to say.
We have an annual performance factor of 3.76, the heat pump is a Waterstage WSYP100DG6 / WPYA080LG which has a heating capacity of 8KW, so in our case that would be 8*1800/3.76, right? Or do you use the nominal heat output of 7KW for the calculation?