ᐅ Decision on Heating System (Including Breakdown of Investment Costs)

Hello everyone,

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

Property information
- Detached single-family house; outskirts of Leipzig
- 10.39m x 11.15m; no basement, ground floor + first floor + finished attic, 213 sqm (including attic)
- No obstacles facing southwest orientation
- Only one neighbor in the entire street has an air source heat pump
- Gas is available at the property

The following heating system options are available:

Option 1:
- Air source heat pump Vaillant VWF 88/4 with aroCollect
- Exterior wall construction with 36.5 cm (14.4 inches) Poroton brick, brand Eder XP9
- Costs (before deducting any subsidies) = 29,162 EUR

Option 2:
- Ground source heat pump Vaillant VWF 88/4
- Exterior wall construction with 36.5 cm (14.4 inches) Poroton brick, brand Eder XP9
- Costs (before deducting any subsidies) = 35,401 EUR
- Possibly additional surcharge for soil class 6-7 solid rock per linear meter at 13.45 EUR and piping for unstable soils per linear meter (from 10 m) at 13.45 EUR

Option 3:
- Gas condensing boiler Vaillant VC146/5-5 including VRC700/5, solar system with 4 solar collectors VK145 for heating support
- Exterior wall construction with 42.5 cm (16.7 inches) Poroton brick, brand Eder XP9
- Costs for gas connection still uncertain
- Costs for gas + solar = 29,067 EUR + extra charge for thicker masonry = 4,926 EUR; total = 33,993 EUR

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

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

Thank you very much
Dirk