Air heat pump or use gas and solar?

@Cascanda:

where are the annual costs in euros for your neighbors with the air heat pump approximately? (if they are over 800€?) How large are the houses?

@All:

do I now need a full modulation air heat pump to be reasonably sure to be cheaper than gas + solar thermal system?

@Cascanda:

what are the annual costs in euros for your neighbors with the air heat pump approximately? (if they are over 800€?)
How big are the houses?

Hello,

none are below 1000-1200€, about 130-150 sqm.
The gas users have monthly installments of about 120-140€.
Of course, this is not very conclusive since there are not many properties.

Regards...

Thank you very much... I have already inquired in the new development areas near us, but almost all of them had not even installed the pumps for a year.

...do I now need a full modulation air heat pump to be somewhat reliably cheaper than gas + solar thermal system?

What is the actual demand (power, energy) for heating and hot water? Which climate region?

best regards

The climate zone is 7a. Of course, I cannot say the actual demand....how could I? We are a household of three people and like to have 20°C in the room in winter. From 1 p.m. someone is usually at home on weekdays. Hot water usage is average. Are the two systems so close to each other that it has to be calculated that precisely? Accordingly, with small deviations, one or the other might sometimes be worthwhile?

The climate region is 7a. Of course, I cannot say the actual demand....how could I?

How can you want to build a house without first knowing what consumption costs you will later have to expect for heating, hot water, and possibly ventilation? That would never occur to me.
Of course, the actual demand can be calculated in advance! That is the crucial basis for everything else. The consumption is then obtained in connection with the respective technical solution. This allows these, or the investment for them, to be evaluated.

.....Are the two systems so close together that you have to calculate it that precisely?

The days of open campfires are over. You didn’t have to calculate anything then. Modern technology is expensive, can be very efficient, but at the same time is also very sensitive. Without exact planning/dimensioning you will get a heating system that provides warmth, but it will not be efficient.
The systems are not close together, but depending on boundary conditions, far apart. With heat pumps, consumption is lower than demand, the specific price per kWh is higher. With conventional heat generators, it is the other way around.
Often in forums the question is asked: "We have xy, is the consumption normal?" Completely pointless, because what do you want to compare it with if you don’t even have the concrete figures for your own building? This is how it happens that buildings have higher consumption over decades than would actually be necessary.