ᐅ What type of heating system is suitable for a 160 m² (approximately 1,722 ft²) house?

Which heating system is recommended for a 160 m² (1,722 sq ft) bungalow with a ceiling height of 2.50 m (8.2 ft)?
We are currently leaning towards underfloor heating combined with gas.
According to the heating engineer, underfloor heating should cost about €30 net (including materials and labor). Control systems are extra, depending on the room.
Is this price generally reasonable? I have no knowledge of these systems and was completely indifferent to this subject until now.
How expensive is an air heat exchanger (or similar) roughly?
Which type of heating is most efficient when combined with underfloor heating?

Neubau2013 schrieb:
...We are currently leaning towards underfloor heating and gas. According to the heating contractor, underfloor heating should cost around 30 € net (including materials and labor).

If there is no proper sizing or calculation, that price unfortunately tells you nothing. Heating surfaces and pipe hydraulics must match the room heating loads and the heat generation system.

Neubau2013 schrieb:
...Which type of heating system is most efficient when combined with underfloor heating?

That always depends on the specific conditions of the building project. Unfortunately, there are no universally valid rules, as many would like. Moreover, efficiency has to be defined. If it’s exclusively about energy (kWh), heat pumps are likely the best option since their consumption is lower than the demand. With conventional heat generators, it is the other way around. If overall costs are considered (investment or capital service as well as operating expenses), the price per kWh also plays a role.

Best regards.