ᐅ Condensing gas boiler with solar system for hot water and heating – is it a good option?

Hello forum community,
could someone please tell a complete novice if the following concept for our house is okay?

Gas condensing boiler with solar system for hot water and heating
Water storage tank: 750 liters (198 gallons)
Collector area: 10 m² (108 sq ft)
House size: 153 m² (1,646 sq ft)
Prefabricated house (KfW70 standard)
3 people, possibly a child may join later
Underfloor heating

If you need any additional information, please let me know.
I would really appreciate your feedback!

Best regards,
hautameki

Hello,

hautameki schrieb:
....can someone here possibly tell a complete novice whether the following concept for our house is acceptable?!

That depends on the homeowner’s requirements. 😉
The price of the offer can only be assessed in relation to the final energy consumption (heating, hot water preparation, possibly ventilation, possibly cooling) based on a realistic consumption forecast.
Solar thermal systems are usually only truly effective on paper for single-family homes (primary energy).
Additionally, general contractor (GC) offers often meet the advertised efficiency standards only on paper. Considering the actual conditions, the result may only meet the minimum energy-saving regulations or even perform worse!
In other words, the building ends up being too expensive compared to the actual performance. This can amount to €10,000 or more.
In one specific example, the overpaid sales price was €46,000!
Prefab houses also frequently have issues with summer heat protection.

Best regards.