Gas heating without solar thermal?

Sounds like an appealing alternative, or is there a major calculation error somewhere?

If you want to calculate correctly, you have to consider that payments always occur at a specific point in time. The conversion then takes place using an (assumed or known) interest rate ("discounting", determining present value, ...).

Nah... it's actually basic knowledge when building a house...

Wow, in my opinion, you're setting the bar high there. Where can a layperson read understandably what is legal and what is not (specifically regarding heating and hot water)? And what is technically feasible/sensible? And where does a layperson get tools and information to then determine what is financially sensible? (These are not rhetorical questions; I am genuinely interested in the answers ).

Everything is stated in the Energy Saving Ordinance and Renewable Energy Heat Act...and if you don't understand the text...just search for where someone has worked it out for a layperson...and there are plenty of those.

What is technically feasible/sensible is a case-by-case decision because it may be possible at your neighbor’s place but no longer at yours.

You have all the necessary tools and means right in front of you...now that you are reading this answer...if you don't know how to use them, then of course only a professional can help...but you have to be very careful...because very few are unbiased.

Hello,

basically it is certainly possible without solar, but you should keep this option open. Open, for example through appropriate empty conduits or a corresponding system selection. The fact is, in a few years the zero-energy standard will be the benchmark in new construction. This also means that your house will compete with other properties (especially in the case of renting or selling, but also for example in the case of using it as collateral for a loan) and the goal must be that your own property performs well in this regard. If I install a solar thermal system, then perhaps not only to meet legal requirements, but to achieve a truly sustainable effect for hot water preparation and heating support.

The ultimate wisdom does not lie in the amount of KfW funds and energy savings, but also in the effect on the property value.

Best regards, Erik

If I implement a solar thermal system, then perhaps not only to meet legal requirements, but to achieve a truly sustainable effect for hot water preparation and heating support.

I have a lot of understanding that you represent your industry; but the above nonsense should be obvious even to you Rheinische greetings

Hello, we have received a KW 70 standard. Approximately 220m² total area, of which 170m² is living space floor area including sloped ceilings. Heating gas with 300l water storage tank connected to the solar thermal system on the roof. (2 panels)

Since May I have not used any gas. The entire hot water preparation is currently done through the panels. During the transition phase when the sun was shining, the underfloor heating was also supplied through this. We are now probably reaching an energy consumption of about 30kW/m² in gas consumption. How this would look without the thermal system I cannot say.

PS (however, I burned about 3rm of wood in the fireplace in winter, this energy amount must still be added)