Finally, things are moving forward here. Fortunately for you, I am not allowed to go out for at least the next 5 days and am therefore on call for further calculations and arguments.
Oh, what happened there? Did our house shrink? We came from 4500 kWh, didn’t we?
Then also offset the domestic hot water heat pump. The 200€ seem about right, but most homeowners probably won’t do that after the warranty period. The heat pump already reports errors, and otherwise maintenance consists of looking inside the heat pump and nodding importantly. Possibly the annual performance factor is also read off.
Sometimes I have the feeling that you don’t even have photovoltaics that should make you independent in winter. With 9.5 kWp from November to January, I didn’t get 100 kWh per month. Nothing comes in winter, and you have to buy electricity for operation. My "plus energy house" with 6–8 cents in summer doesn’t help me either! That’s exactly why we have all the discussions about dark doldrums in politics.
Oh, just say upfront that you have no clue about greenhouse gas emissions and their accounting according to the GHG Protocol.
Sorry, but that’s the worldwide (industry) standard for determining sustainability. It doesn’t change my assessment of the underfloor heating as a massive environmental sinner. It’s really time for your master’s thesis, because calculating yourself is indeed very enlightening and unfortunately disastrous in your case.
And it doesn’t help that you can hold your coating elements in your hand. Heating usage unfortunately pulls the CO2 footprint of our model house down by at least 16–20 tons of CO2 over time. On the other hand, the heat pump owner can nicely fly to New York a couple of times for a hot dog.
A fundamental question: how were the 92/95% efficiency figures determined? That’s the efficiency for the heating glass, right? What I didn’t understand is how the heating output from 230 V mains voltage is throttled. You need a transformer for that, right?
Then just take the 4500 kWh—you still can’t calculate well. Moreover, current and especially new construction will trend towards passive houses, and there we talk about 15 kWh/m², so for your example then 2,250 kWh and two-thirds of that = 1,500 kWh.
For the DHW heat pump maintenance costs—that’s a better refrigerator—do you maintain your refrigerator? So in your calculation, add another 20 × 200€ = 4,000€.
The heat pump reports errors—> and then it gets expensive ;o)
Nothing comes in winter—> I have a photovoltaic system and don’t know what’s wrong with yours. Just google monthly figures (you have time) from recognized institutes or via Photovoltaic-Sol. And it’s currently 8.6 cents/kWh (rising trend!). And that already helps—I calculated that. Just check again.
Regarding your remark that I have no idea about greenhouse gases because I criticize your Denglisch spelling, that is completely unfounded and simply embarrassing. YOU think you are so smart—makes me sick—and YOUR assessment is just completely wrong.
Say something about hand vs. forklift—> but nothing comes again. Better to be dumb and smartass.
Now to your factual remark (I won’t answer the nonsense at the beginning anymore in the future).
95% is the heat output inside and 5% the losses outside, measured by the Hermann Rietschel Institute at TU Berlin in a test room. We do NOT need transformers—we usually work directly with 230 V. You can google everything else—you have time.
I don’t have as much time as you (I prefer to take care of my customers) and will therefore only briefly reply to your nonsense—more on concrete questions gladly.