Gas heating without solar thermal?

A fireplace is also planned, however we have not yet dealt with models and efficiencies, because that is primarily intended for coziness. But interesting that there are still other levers.

For me, it would be interesting whether I correctly interpret the option with controlled residential ventilation/heat recovery.

Hi,

the answer is probably: No!

For our KFW70 with gas condensing boiler we needed both controlled residential ventilation/heat recovery and ST domestic hot water. That was already required by the Energy Saving Ordinance 2009. Because of the coverage rate for alternative energies.

Yes, the variants will also be calculated by experts. Although it is now 2016, the old Energy Saving Ordinance still applies to us because we submitted the application in December. In addition, we do not want to achieve the KFW standard, but only want to undershoot the minimum requirements by 15% through a replacement measure in order to be able to do without solar thermal. A better building envelope was the first variant – in addition, I then came across the issue of controlled residential ventilation/heat recovery.

Best regards