Which KFW standard and which technology in new construction

The DIN standards, the ventilation concepts. The fact is, a building entirely without any forced ventilation is legal and is always accompanied by the builder with the note to ventilate regularly! For example, we received a kind of manual for the house, where this is clearly stated and described in case of waiving forced ventilation, including a description of how to ventilate properly. That places the responsibility on the customer. I want to emphasize again that I am not against controlled residential ventilation for comfort reasons; however, when it comes to money that you want or have to save, the Regelair window rebate ventilation combined with an exhaust fan in the bathroom also works sufficiently well for little money. That is how it is. We have zero mold and good air quality in the house. Regarding the LWWP heating versus gas. The former may be technically mastered, but in practice, the devices prove to be prone to faults. I see it here in the construction area with my own eyes. Our children already needed factory service because the thing consumed electricity without end, and it still wasn’t warm. Our neighbor across the street also had technicians come twice within just under a year because the water was too cold. In winter, the place wasn’t warm. I could continue with three other new buildings while all the old-fashioned, building-technology-resistant gas heating owners just heat. Keep it simple, rugged, reliable, the Brit rightly says. Regarding all the KFW nonsense. The KFW scheme focuses only on energy to save CO2. The production of all the insulation boards, plastic foils, and foam sleeves is not considered. Human scale is not considered either. The higher the KFW standard, the more extreme the plastic bag is that the house becomes. Passive house, you actually may not even open the windows anymore. Anyone who has spent a few days as I have in such a planned conference center, where only artificial climate exists indoors, will agree with me: no, that is not a feeling of well-being. Karsten

I didn't say it was bad. It's just more expensive than gas because 1 kW of heat with electricity costs around 30 cents and 1 kW of heat with gas about 6 cents. Since the air-water heat pump is also more expensive to purchase, you should keep that in mind. That's all I wanted to say, nothing more or less.

That statement is pretty nonsense. Depending on the air-water heat pump and electricity tariff, one kWh costs 5-10 cents. You don't even pay 30 cents just for a kWh of electricity...

You don't even pay 30 cents just for one kWh of electricity...

Yes, you do. Nowadays, you really have to look hard to find cheaper prices when you include basic fees.

I didn't say it was bad. It's just more expensive than gas since 1 kW of heat with electricity costs about 30 cents and 1 kW of heat with gas about 6 cents. Since the air-to-water heat pump is also more expensive to purchase, one should keep that in mind. I didn't want to say more or less than that.

It was not considered that the air-to-water heat pump boosts the performance of 1 kWh of electricity to 3-4 kWh of heat ... it is not just an electric heating element, but rather a heat pump! However, it should be clear to everyone that not much heat can be extracted from -20 degrees cold air, as the seasonal performance factor drops to miserable values. But seasonal performance factor values around 2-3 should still be achievable.

I never said it was bad. It's just more expensive than gas because 1 kW of heat with electricity costs about 30 cents and 1 kW of heat with gas about 6 cents. Since the air-to-water heat pump is also more expensive to purchase, you should consider that. I didn't want to say more or less than that.

Oh, I see. So your claim is that in winter, the air-to-water heat pump practically runs continuously on the heating element? That would, of course, be complete nonsense and has nothing to do with reality.

It is unfortunately common to read that in winter a lot of heating with electricity will be done and that this is justified by the demon heating element [Heizstab]. It is true that the heating element comes into play at temperatures between -10 and -16 degrees. But please also look at how often this was the case in recent winters when considering this argument. It is negligibly rare that heating was done continuously with the heating element. Winters tend to be warmer as well, so the likelihood of relying on the inefficient heating element (which it indeed is) decreases. Yes, gas is cheaper and also has robust technology, which is not to be disputed. It is a possible solution, but not the only one. Demonizing [WPs (Luft-Wasser-Wärmepumpen)] is not an option, however.