ᐅ Masonry using Ytong blocks, 24 cm or 30 cm thick, for a single-family house?

@xMisterDx

The basic idea behind the Building Energy Act and the BEG is to save energy.
The heating load results from transmission and ventilation losses.
If these losses did not exist, no one would need heating or air conditioning.

The current legislative proposal to replace all electricity meters with modern, network operator-controlled meters clearly shows the direction energy and its costs are heading.

Heat pumps quickly reach their limits of economic efficiency with their annual performance factor.
At current prices, we are talking about an annual performance factor > 5,... when comparing gas and electricity, while gas prices are falling.

parcus schrieb:

The current legislation proposal to replace all electricity meters with modern, grid operator controllable meters clearly shows the direction the trend of electricity and its costs is heading.

This is less about costs and much more about replacing controllable power generation with fluctuating electricity from wind and solar, while gas power plants, which serve as a backup, are currently failing. The only remaining solution is for the tail to wag the dog, meaning consumers in households will be switched on and off 😉

parcus schrieb:

With the current prices, we are talking about a seasonal performance factor (SPF) greater than 5,... comparing gas and electricity while gas prices are falling.

No, we are not. I just checked briefly on a comparison platform. Electricity currently costs about 44 cents per kWh, gas about 14 cents per kWh. Achieving a seasonal performance factor just above 3 is absolutely doable in new builds.

xMisterDx schrieb:

By the way, for anyone complaining about the load-bearing capacity of aerated concrete, I wish you good luck if you ever want to install an awning or a somewhat heavier lamp on your ETICS (External Thermal Insulation Composite System) facade. Then you can talk about load capacities. But not with aerated concrete, right?
You just insert wall anchors and that’s it.

Of course, you don’t hang loads on the plaster or the insulation in an ETICS, but rather on the masonry.
You probably wouldn’t hang your kitchen cabinet on the wallpaper either, but anchor it through the underlying plaster into the aerated concrete, right? So please spare us such embarrassing statements.

Aside from that, an awning is ideally anchored in the ceiling joists, not the masonry.

The strength of the aerated concrete blocks, and thus their load-bearing capacity, decreases with increasing thermal transmittance (U-value). This also applies to mass (i.e., sound insulation). You can check the datasheet for this. Whether this is relevant for individual builders can be debated.

@WilderSueden

Even with the prices, you are barely matching the annual performance factor of gas. For new customers, nothing is happening below 65–69 cents per kWh.

parcus schrieb:

@WilderSueden

Even with the current prices, the seasonal performance factor roughly matches that of gas.
For new customers, nothing is available below 65-69 cents/kWh.

Who exactly is this new customer, and why are their terms so relevant?

I am an existing customer, like most people probably are, and I just received my 2022 bill for heat pump electricity. I paid 16.7 cents/kWh and about €120 (roughly $130) annual basic fee. No price increase so far. The supplier reduced my advance payment to €39 (around $43) per year.
My heat pump consumed 2100 kWh of electricity in 2022—a very warm year—with some of that generated by photovoltaic panels myself. The house is 195 m² (2,100 sq ft), built to KF55 standard, with centralized ventilation for four people. In previous years, consumption was about 10% higher.

Currently, the basic electricity supply here costs 43 cents/kWh, gas 18 cents/kWh. That is a factor of 2.3. The heat pump is still clearly more economical.

parcus schrieb:

For new customers, nothing is happening below 65-69 cents/kWh anymore.

Sorry, but I don’t believe that. Two months ago it wasn’t any better here either, but since then prices have dropped significantly. Whether it’s really worth choosing a provider like Grünwelt again is debatable. Just take a look at the comparison platforms; the relevant providers deliver nationwide in Germany anyway.