Is it mandatory to build according to the Energy Saving Ordinance (2009)?

What is the point, for example, of an air heat pump, AHP or geothermal heat pump without additional heating? The efficiency of such systems is a joke, the price in relation to that is completely unhealthy. Those who have something like that without additional heating will surely love this winter , at cold temperatures the house never really gets cozy warm and the resulting high electricity costs are also not exactly energy conscious, especially in the future when electricity prices continue to rise.

Ever been in a house with a aforementioned (well-planned) heating system? You should then have the heating bill (= electricity costs) shown to you. I’m already looking forward to our heating with geothermal energy + controlled residential ventilation (not to mention the feel-good factor)

Yes, in my own house - gas condensing boiler - back then in 1997 about 4000 DM - has been running without problems since then, annual consumption for about 180 sqm about 13000-15000 kWh gas and if I want, always cozy 23 degrees Celsius or even higher. Gas is even expected to become cheaper, our supplier has at least announced this for the coming years. We use about 4000 kWh of electricity per year, but that also includes a complete office and a motorhome whose hot water heating is heated with a 1500 KW heating cartridge in winter.

If you heat a 100-150 sqm house with geothermal energy, that should definitely not be a problem, I also think that could be warm enough, better than an air heat pump. If it’s not enough, there is still the heating cartridge, plus controlled residential ventilation - but all that also requires energy. What do you do in case of a power outage? Without a fireplace I personally wouldn’t plan a heating system, you never know what else awaits us in the future. We originally also considered geothermal energy, but discarded it again because of the high effort, the disproportionately high costs and the uncertainties regarding future maintenance. As I said, for me it’s about possible autonomy if electricity and gas ever fail. Then we will just build to Kfw 70 standard and then gas condensing boiler and a fireplace should be enough and we will be within the energy saving ordinance. Even if I could afford it, everything in me resists additional solar. It hadn’t paid off even 16 years ago. I once calculated: the expense for the heating (underfloor heating) for our planned 200 sqm house with controlled residential ventilation, gas condensing boiler, 10 sqm solar and fireplace would cost between 36k and 40k. I personally find that totally crazy in relation to the total house construction costs! If our legislators only want to stimulate the economy… how is a normal family with a normal income supposed to afford something like that?

???? What do you want????
After your initial thread, the question was whether you have to build according to the [Wärmeverordnung 2009].
Yes!
No one forces you to build Kfw70 or lower!
Your house from 1997 was also built according to the corresponding thermal insulation regulation.
Back then there were also doubters whether gas was the right choice... (there are still some nowadays who consider oil as the ultimate solution )
I haven’t read that you want to build for 2 people? Then gas + solar from - no idea - 2-3sqm is enough, with controlled residential ventilation + heat recovery you will reach the [Energieeinsparverordnung 2009] standard.
Why are you now aiming for Kfw70 or less?

Expensive fun! We will be at around 25-27 thousand euros for the deep drilling/heat pump and underfloor heating for a house of about 240 sqm. Added to this is the controlled residential ventilation. For us, the supplier no longer offers a gas connection at all. For that price, I, for example, can’t put in a pellet heating system because I would then need an enormous amount of space. A wood stove and possibly a water jacket (otherwise you have 35 degrees at the chimney location and not in the other rooms) is also not to be dismissed price-wise (at least if it is not DIY store quality).

P.S. With the heat pump, no electric auxiliary heater is needed for us in winter.

@ ypg - yes, my question was simply whether I absolutely have to add solar in addition to gas and what happens if I don't do it. According to my BT supposedly yes, because the energy saving ordinance would require it if I want gas condensing technology and to achieve Kfw55. Apparently a gas heating system must always be coupled with solar. But I don't want solar because of the uneconomical aspect. For the approximately 10,000 euro additional cost, I can probably pay the gas bills for at least 10 years, maybe more.
@nordanney - yep, it's pretty expensive, but it also includes controlled residential ventilation with heat recovery, which alone accounts for almost 10k in the planned size. So you will also end up in that price range.
The good thing about geothermal energy is that you are really almost self-sufficient or independent.
I would also like to avoid gas and only heat with the stove. It's just annoying when you are away for two weeks in winter, then nothing heats anymore, or you have to install an additional heating cartridge. But I don't know if that would even be allowed according to the energy saving ordinance. I don't want a pellet stove, only a pure wood stove with water jackets.

Hello,

... Yesterday there was even a post on the T-Online site about the KfW allegedly keeping studies under wraps that prove the KfW standards are disproportionate to the enormous investment costs and are actually uneconomical.
We have held this opinion for a long time anyway.

Without background information, these are in any case assumptions and suppositions. Additionally, for every building the actual demand (capacity, energy) for heating and hot water and the expected consumption based on that can be determined in advance. Once you have concrete figures, investments or the capital service can be evaluated reliably.
It quickly becomes clear which solution is economical and which is more of a cuckoo's egg. KfW funding does not automatically or fundamentally mean that a concept is economical. That is exclusively the responsibility of the builder or their planners and consultants.

... My builder says that’s not possible, at least a solar system must be added, otherwise we do not meet the requirements of the Energy Saving Ordinance.

That is a requirement of the EEWG.

... But do you actually have to build according to this Energy Saving Ordinance?

Initially yes, but not necessarily. For this, an expert opinion according to § 25 Energy Saving Ordinance is required.

... Reply from the head of the building authority: He doesn’t know the ordinance, it doesn’t exist and no one can be forced to comply, that would be like communism (...correct and well recognized:cool .

I would doubt that he will remain head of the building authority for much longer.

... So what is or what actually happens if you don’t build according to the Energy Saving Ordinance?

The Energy Saving Ordinance is building law to begin with. Proof of compliance with the conditions and requirements (Energy Saving Ordinance demands) is part of the building permit. There may also be stricter requirements under the respective state building regulations, since the implementation (enforcement of the Energy Saving Ordinance) is a state matter. Simply not building according to the Energy Saving Ordinance can mean that the building permit is subsequently legally invalid. Very fatal for the builder and associated with considerable consequences.
The only option: expert opinion according to § 25 Energy Saving Ordinance.

Best regards