Vestaxx window heating - experiences?

... and the remark with the colleague with a locked profile I find quite pathetic. I don't need that for my arguments and would strictly reject it.

But there is apparently someone out there who has understood it and can calculate.

Yes, I know from multiple discussions that it is really hard for some to understand, so here it is again and gladly also briefly.

What was it again with all the wrong-way drivers on the highway, where one should maybe ask oneself whether one might not be one of them after all? In any case, I don’t consider it a culture of discussion to accuse everyone else of not understanding, even though this thread is full of arguments. Why is it always the same argument from your side about photovoltaics (although it has been said multiple times that you can and should buy them with a heat pump or any other heating system as well)? Just compare your heating system with others like air-to-air heat pumps, storage heaters, fan heaters, electric underfloor heating, etc.

I also don't know why the colleague insists on forcibly involving the heat pump. Maybe I'm just not smart enough. His calculation works just as well without it. "Cheaper" heat generator with efficiency <1 vs. expensive heat generator with efficiency >3. The balance always shifts when you consider the electricity price. The cheaper the electricity, the longer it takes for the heat pump to catch up to the advantage of the window heating. And a solar system only produces cheap electricity if it was cheap itself. Mr. Vestaxx should calculate the tipping point with real numbers.

The first remark I find extremely exciting and I fully support it.
That fits perfectly with this topic. Who are the wrong-way drivers?

And I do not assume everyone does not understand it (that would be presumptuous and not my style).
You just have to be open to it and not always, always refer only to the annual performance factor of the heat pump and its low consumption.

And now again your hint that one could also supply a heat pump with photovoltaic.
Of course, that is certainly the technically more efficient, but precisely not economical.
Please refer to my remarks from previous answers for that.

I wonder, why is there never a comprehensible counter-calculation here?
Arguments yes - but then please back them up with numbers, data and facts.
Do a holistic consideration - but again, nothing comes of it.

What would be the point if I compare one direct electric heating with the other type, when it is always only the heat pump being put forward here. But if you want - gladly:

- I think nothing of night storage heaters -> no longer up to date, no comfort but strangely still allowed.
- Electric underfloor heating -> also okay, but possibly more losses than with our system
- Air-to-air heat pump -> not bad, but too much stirring up – air is a worse heat carrier
- Fan heater -> extremely cheap (I have mentioned that before) but also no good comfort due to convection
- Other infrared heaters -> also gladly, but they are usually too hot and therefore in a worse comfort class

I end again with the call: Make a counter-calculation here publicly with comprehensible data!!!
Why is there never anything substantial? As an incentive, I give you an annual performance factor of 10 for the heat pump free of charge.
But please make it comparable anyway – so the same investment costs with an overall consideration of the energy demands in the house!

So – now come with your full cost calculations.

"in der Ruine" already writes something very correct. The electricity price is an important parameter in the whole calculation. How will the electricity price develop? Will it go back down to pre-Ukraine levels? I don't believe so.

The photovoltaic price was quite stable for a long time but is currently actually rising. The kWh price from a photovoltaic system was therefore also quite well calculable. It was between 9 - 11 cents/kWh, depending on the system size. And this price does not change once the system is installed. One can even decouple from the Renewable Energy Act feed-in tariff and move into direct marketing. The market price for the kWh was, for example, about 31 cents/kWh in July 2022.

That is precisely why it is so important to acquire a photovoltaic system yourself. Only, after purchasing a heat pump, in most cases there is no budget left for that. I am not talking here about rising interest rates and delivery times for heat pumps.

Colleague from the management with a blocked profile? :)

Do you believe that?
Interesting assumption.