Decision on heating system (including list of investment costs)

Hello everyone,

I am planning to build a new single-family house and would appreciate your advice. Based on the following data/costs, which heating system would you choose?

Info about the property
- Single-family house – detached; Leipzig surrounding area
- 10.39m x 11x15m; without basement, ground floor + upper floor + attic (converted), 213 sqm including attic
- No obstacles with south-west orientation
- Only one neighbor on the entire street has an air heat pump
- Gas is available on the property

Regarding the heating system, the following options exist:

Option 1:
- Air heat pump Vaillant VWF 88/4 with aroCollect
- Exterior masonry Poroton stone 36.5 cm, brand Eder XP9
- Costs (before deduction of subsidy opportunity) = 29,162 EUR

Option 2:
- Brine heat pump Vaillant VWF 88/4
- Exterior masonry Poroton stone 36.5 cm, brand Eder XP9
- Costs (before deduction of subsidy opportunity) = 35,401 EUR
- Possibly plus surcharge for soil class 6-7 solid rock per running meter of 13.45 EUR and piping for unstable soils per running meter (from 10 m) of 13.45 EUR

Option 3:
- Gas condensing boiler Vaillant VC146/5-5 including VRC700/5, solar system 4 x solar collectors VK145 for heating support
- Exterior masonry Poroton stone 42.5 cm, brand Eder XP9
- Costs for gas connection still uncertain
- Costs for gas + solar = 29,067 EUR + surcharge for thick masonry = 4,926 EUR; total = 33,993 EUR

If we receive subsidies:
Air heat pump = 27,662 EUR ; Brine heat pump = 30,901 EUR ; Gas = 33,993 EUR

Without subsidies:
Air heat pump = 29,162 EUR ; Brine heat pump = 35,401 EUR ; Gas = 33,993 EUR

Thank you very much
Dirk

Brine. You don't see it, it makes no noise, it is more efficient. Moreover, the subsidy for air-water heat pumps can also fail.
By the way, the subsidy is €5000 for brine due to the load management bonus / smart grid label (+€500).

With prices including subsidies.... definitely ground source heat pumps. No ugly air-to-water heat pump standing around somewhere, very efficient, the drilling is "for eternity" and will outlast you by many years. And compared to gas: the roof remains free for the much more sensible photovoltaic system. You can throw solar collectors in the trash,... they do produce endless hot water, but unfortunately mostly when no one needs it (unless you have a huge pool). ;)

How do you arrive at 29k for gas/solar thermal? That seems very expensive to me.

Congratulations on a plot of land in Markkleeberg. I would also take the brine, the 3k are more or less peanuts. However, gas is utopically expensive... if it is available in the street, it is much cheaper. I would get further offers. I find all offers quite expensive, is the complete underfloor heating included at least or will that be added on?

The mentioned costs also include: underfloor heating, composite pipes, and insulation as well as the complete installation

Sorry, I forgot the info. Does it still seem too expensive?