Controlled residential ventilation with heat recovery instead of solar thermal energy?

A photovoltaic system has absolutely no influence on the primary energy demand. You probably mean solar thermal.
I would have this calculated in advance instead of blindly trusting the architect. In my opinion, this should indeed be possible if you invest a little more in insulation additionally. This then results in a much more sensible overall package, as solar thermal regularly does not pay off and, unlike controlled residential ventilation, also brings no further advantages.

I still wanted to give our conclusion:

Since the Energy Saving Ordinance 2016, gas with controlled residential ventilation without solar thermal simply NO LONGER counts as a replacement measure for the Renewable Energies Heat Act.

Our energy consultant calculated all of this for us, and I think many here in the forum do not understand the Renewable Energies Heat Act.

We comply with the Energy Saving Ordinance with gas + solar + controlled residential ventilation, but even so we do not achieve a 15% lower primary energy demand than required by the Energy Saving Ordinance.

To exaggerate, it would need 50 cm more insulation and windows with a total U-value of 0.3 to reduce the primary energy demand 15% below the Energy Saving Ordinance if you want to use gas with controlled residential ventilation but without solar.

I would claim that not all energy consultants and not everyone here in the forum has read the Renewable Energies Heat Act and in the end only say "yes, that works" because the Energy Saving Ordinance according to the thermal protection certificate is met. It does not.

Because to ONLY comply with the Energy Saving Ordinance, gas + controlled residential ventilation + a little more insulation might be enough.

But a 15% lower primary energy demand than the 2016 Energy Saving Ordinance standard is required to count as a replacement measure for renouncing solar; I can gladly post the legal norms again.

Those who have done gas and controlled residential ventilation without solar according to the 2016 Energy Saving Ordinance are welcome to post their complete thermal protection certificate—I am very curious about the calculations.

For the 2014 Energy Saving Ordinance, that might still have been possible, but not anymore due to the tightening of the 2016 Energy Saving Ordinance.

If your energy consultant has explicitly given you this in writing otherwise, then presumably he is liable anyway and since it is probably never checked, you were luckily able to save a few euros.

Our energy consultant calculated all of this for us

I do not want to claim that it works with gas and controlled residential ventilation in every case. However, there is a bit more to it than just the evil Renewable Energy Heat Act.
In your case, it was probably rather the geothermal law in BW that forced you towards solar thermal energy.

There are a variety of adjustment options in the calculation by the energy consultant, which are often not used out of convenience/lack of knowledge, or cannot be represented by the software used. And of course, each of the buildings considered is unique in itself.

I rather think so too. Gas condensing boilers and decentralized controlled residential ventilation are the two components used by many construction companies here in the region for the Energy Saving Ordinance standard house, without solar. Our construction company alone builds about 400 Energy Saving Ordinance houses per year; especially with the tightening of the Energy Saving Ordinance in 2016, the switch was made from solar to decentralized controlled residential ventilation. It certainly was not changed out of whim or without clarification.

1) In your case, it was probably the Geothermal Energy Act in BW that forced you to use solar thermal energy.

2) There are many adjustment options in the calculation by the energy consultant, which are often not used out of convenience/ignorance or cannot be represented by the respective software used. And of course, the buildings considered are each unique.

Regarding 1) No, because the Renewable Energies Heat Act BW only applies to renovations and NOT to new buildings, it would have been great for us, since then we could have done photovoltaics instead of solar. That would have been accepted as a compensatory measure. The text of the law can be read online.

Regarding 2) All the so-called adjustment options were applied; it’s simply no longer sufficient since the Energy Saving Ordinance 2016, the permissible primary energy demand was tightened so much that it can no longer be easily achieved with gas/controlled residential ventilation. And without solar, 15% less would be required as a compensatory measure to comply with the Renewable Energies Heat Act, never ever. I am still waiting for the calculations to prove this. No hearsay/verbal statements, but complete anonymized thermal protection certificates.

It simply no longer works without 50 cm insulation and windows with a total U-value of 0.3, to put it bluntly; building aside.

Just post your complete anonymized thermal protection certificate from the Energy Saving Ordinance 2016 onwards.

: That is not what it is about at all, you have to meet TWO requirements, which are to be checked separately:

1. Energy Saving Ordinance
2. Renewable Energies Heat Act

Regarding 1: The Energy Saving Ordinance and thus the annual primary energy demand can possibly be achieved with gas/controlled residential ventilation + better insulation under certain circumstances.

Regarding 2: Without solar, renewable energies are missing, so controlled residential ventilation as a compensatory measure. This should result in the annual primary energy demand being 15% BELOW the current Energy Saving Ordinance 2016. However, by lowering primary energy demand by 20% through the Energy Saving Ordinance 2016, this is no longer achievable. So one would have to achieve with only the building and controlled residential ventilation an annual primary energy demand -15% from the tightened -20%.

You can comply with the Energy Saving Ordinance but violate the Renewable Energies Heat Act; however, nobody probably checks this. That is probably why it is still done anyway.

The contact details of the thermal protection calculator of the builder would certainly interest some builders.

Unfortunately, no one here posts an anonymized thermal protection certificate from the Energy Saving Ordinance 2016 onwards to be able to check this.

Everyone allowed to waive solar should be grateful for their energy consultant and remember to hold him liable if necessary.

No, because the Renewable Energy Heat Act BW applies only to renovations and NOT to new buildings

You are right.

the so-called adjustment screws have all been implemented

I find that interesting, you didn't even ask what exactly I am talking about. But that also fits your demand that someone should prove you wrong by posting a heat insulation certificate. Just post yours here so we can make sure that your energy consultant has actually explored all options.

Unfortunately, no one here posts an anonymized thermal insulation certificate according to the Energy Saving Ordinance 2016 to be able to check it.

Ours wouldn't help much there. We built KFW 55 with an air-water heat pump and central controlled residential ventilation. You can feel free to take a look, for example, on the pages of Ernst und Ernst or Tönjes und Meichsner and ask how they handle these values.