Gas, heat pump, and solar for a single-family house?

I find 8cm mineral wool also rather meager...

Maybe also 16cm? I can’t even do the math right now ops:. The wall will be about 46cm, of which 17.5cm is KS, the rest mineral wool, air layer and facing bricks. Sorry .

Regarding the heat pump - we definitely want to install a gas connection into the house because of the chimney (for wood we have too little distance to the neighbor ). And then it would be nonsense not to use it for the heating as well. As far as I understand, you can switch to a heat pump later (in 15 or 20 years or whenever).

Why calculate? It's all described in detail in the calculation.

You can always switch to a heat pump – but gas primarily because of the fireplace (which then – sorry – isn't a real one)? Then I would rather operate the fireplace with a bottle – after all, it's only a few days of use per year.

At least, if I weren't opposed to a heat pump...

We had said from the beginning that we would prefer to heat with gas.

If it were possible to do without solar with a heat pump, we might have to reconsider.
But the installer also said that with a heat pump, you would have to additionally heat with gas in harsh winters, a heat pump alone would not manage. I have also often read that the calculations are difficult (with this seasonal performance factor or whatever that means), and then the unit would either be oversized or too small and you end up heating with expensive electricity.

The problem is also that everyone tells you something different, maybe also because heat pumps haven’t been around for that long. With a gas heating system, we are definitely on the safe side in terms of heating.

The heating question is often also a gut feeling - it must suit the user.

I can understand the decision!
We also felt more comfortable with a gas heating system and decided in favor of it.

If you could do without solar for a heat pump, we might have to reconsider that.

So our air-to-water heat pump works perfectly fine without solar support.

But the installer also said that with a heat pump you would have to heat additionally with gas in harsh winters; a heat pump alone wouldn’t manage.

I have to disagree with your installer. We don’t have a gas connection, and yet it was nice and warm in the house during winter with outside temperatures down to -24°C.

I’ve also read often that the calculations are difficult (with this annual performance factor or whatever that means), and then the unit is either oversized or too small, and then you end up heating with expensive electricity.

So far, we have only used the electric auxiliary heater (heating rod) once, namely at the initial start-up of the heating system at the end of November 2014. At that time it was also around -15°C cold, and our heating rod logged its only 2 hours of operation immediately after switching on the entire system.

I’m afraid your installer may not have much experience with heat pumps and therefore recommends you “tried-and-true” solutions.

Please don’t get me wrong, I’m not trying to badmouth gas heating, but maybe you should speak again with an installer who is well familiar with this technology before making a final decision.

Regards,

Dirk