ᐅ Heating in Single-Family Homes, Underfloor Heating Renovation, Insulation, Gas Boiler Malfunction

powertdi schrieb:
Can you give me a tip on what you would personally choose?

General recommendations are hardly possible since, as mentioned before, the actual demand for heating and domestic hot water is unknown.
For any type of heat pump, however, the heating surfaces must be designed so that a system flow temperature ≤ 35°C (95°F) can be achieved. This means correspondingly large heating surfaces, narrow pipe spacing, and numerous heating circuits depending on the room heating load. With high room heating loads, existing buildings often reach their limits here. Additional heating is not uncommon, especially in bathrooms!
It should also be considered that a paid natural gas connection already exists!!! Natural gas can also be used very economically for cooking ;-)
Compared to standard radiator systems, efficient use of heating surfaces can yield an additional 15 to 35% energy savings (with special design and dimensioning), especially since heating can be provided ad libitum, which is hardly achievable with underfloor heating.
Tendentially, without knowledge of the individual conditions and therefore subject to reservations, I would lean toward gas condensing boilers (with a wide modulation range) combined with radiators.

Best regards.

What do you think about convector heaters? I personally have no experience with them, but I have heard from acquaintances that they involve only low costs both for purchase and operation.

tischler schrieb:
...but I have heard from acquaintances that they cause only low costs both in initial purchase and operation.

Convector heaters rely on high flow temperatures. However, these are precisely what modern heating systems aim to avoid for energy efficiency reasons.

Best regards

Good to know, I wasn’t aware of that.
Thank you.

So, if I decide to go for a gas condensing boiler, which one should I choose? It must also heat the domestic hot water, either through a storage tank or directly with a gas instantaneous water heater. Which manufacturers are recommended for this...?

powertdi schrieb:
So if I decide on a gas condensing boiler / heater, which one should I choose?

This cannot be answered without first calculating the heating load. Cost-effective options are those with the largest possible modulation range, preferably with an indirectly heated storage tank.
Among devices of similar price, priority should be given to those whose control system allows variable power adjustment of the heating circuit pump. Different manufacturers call this feature by various names, such as "Eco," "Eco+," or similar. Everyone just has their own term ;-)

Best regards.