Energy consultant recommends KFW 55 - Recommended with solid construction?

More of a trick to cheat builders

There is also the trick where the general contractor hires their own structural engineer who "miscalculates" the building envelope... for example, includes the attic even though the top floor ceiling is the thermal envelope...

You don’t really believe that a structural engineer would risk their license so that a builder can save money in the wrong place?

If so, you are more than susceptible to hearsay

Rhineland regards

Isn't the pellet heating system exactly the trick to easily achieve Kfw40? I would think carefully about whether you want to become dependent on a material that constantly needs to be supplied and stored. But thanks for the slide!

@Slide: our house is significantly better in all required respects than indicated on the slide (e.g., wall 0.15). however, the thermal bridge was only considered as a surcharge. without the renewable share (we only have a ventilation system with heat recovery), nothing can be done. well, better more insulation and gas than the other way around, since the latter is just nicely calculated...

isn't the pellet heating system exactly the trick to easily achieve kfw40?

I would think carefully about whether you want to become dependent on a material that constantly needs to be delivered and stored.

but thanks for the slide!

How nice that electricity and gas don't have to be bought from outside, although you become dependent on far fewer suppliers, receive a completely opaque bill at the end of the year, and have to pay retroactively non-transparent price adjustments.

Oh right, oil also has to be stored.

I like the gas station situation and buy pellets when the tank is empty at a price I know beforehand.

Best regards

all the mentioned reasons apply to pellets as well. if the supply runs out in winter, you also have to bite the bullet due to "incomprehensible price adjustments". the bill is also transparent and clear; every kwh/m³ costs x euros + base fee. what is unclear about that? it is exactly like with pellets, where you probably buy in kilograms or m³.

pellets certainly make sense if you can get them cheaply (e.g. through the company). my father, for example, heats his entire house with a wood gasification system because he has access to a lot of firewood. his storage is an entire barn, which is partially larger than the garden of typical homeowners here...

how many m³ or kilos? (in which unit do you calculate pellets?) do you have as storage? where do you store it? how much space do you need for it in the house?

the original statement remains the same. with pellets, you can make kfw look better, but in the end, you have higher heating costs than, for example, with gas, because the insulation is worse due to the accounting tricks than with the gas house. as I wrote above, our house easily met the insulation requirements for kfw55 (probably even good enough for kfw40 - construction expert, do you also have a slide for that?), but we gave up on the air heat pump because it is pure number games and does not save but costs. and seriously: in 15-20 years, if you want to sell, no one will care about the nicely calculated heating system (which will then be outdated) but about the insulation, which you can't just replace easily.