Old building apartment with gas boiler - underfloor heating now, heat pump later

I would say it could depend on the declaration of division. Especially with a subsequent attic conversion, it could be its own sub-community that can pretty much do what it wants because it is clearly separable and should actually be handled differently in terms of maintenance.

In a house from the 1890s, I also doubt that the beams can support the additional load of the underfloor heating.

Are you really not allowed to do that without the involvement of the owners' association?

You can add a layer. But do you really want to lose that much build-up height?

Or mill into it?

Milling without owners' association involvement is not allowed. Neither is changing the heating system.

You can add another layer. But do you really want to lose that much build-up height?

I have already seen solutions where it’s only 2 cm, though of course you have to be careful with the door and so on. The points about the beams and such are also something you need to take a closer look at. It definitely doesn’t seem easy, although if I don’t do it now, I probably will never be able to, so some research here is well invested.

Cutting into the screed is indeed out of the question, and since we want to do the floors before moving in, we don’t have the luxury to wait until the next homeowners’ association meeting in November.

I did some more research over the weekend. Does anyone have experience with baseboard heaters? They are considered radiant heating because they warm the wall, which then radiates the heat. Here's the next question: would this principle also work in drywall construction? Since we are doing quite a bit of "refreshing" anyway, this would be a good opportunity. However, there is very little information on this topic, except for "oh yes, that also exists, but no one really knows it"...

Does anyone here have experience with baseboard heating?

No, I only know the principle from forums, as it is a very special heating technology that is actually no longer up to date and is only needed for specific requirements. It has many disadvantages:
- requires high flow temperatures - which are actually avoided for efficiency reasons
- risk of dust scorching due to the high temperatures
- you can no longer place something directly against the wall or run a cable along the baseboard
- a strong thermal updraft can occur, which can lead to "cold feet." Due to the high air circulation, dust spreads over a large area.

In the context of a renovation, attempts are made to reduce the flow temperatures. For this purpose, modern low-temperature radiators, underfloor heating, and wall heating are used.

Why do you find little experience? See above, it is too specific. Applications can be, for example, apartment renovations where night storage heaters are replaced by a connection to a central heating system (high flow temperature is supplied).

Of course, this will warm your apartment. But if you have radiators, nothing really changes in the end—except that you block the baseboards.

No, I only know the principle from forums, as it is a very special heating technology that is actually no longer up-to-date and is only needed for specific requirements.

I had understood it like this: yes, still higher flow temperature than underfloor heating, but because of the heat emission through the wall instead of radiators, air turbulence is reduced and somewhat lower temperatures are perceived as comfortable, allowing the temperature to be lowered.

The main problem stated was that the wall must be free.

Irrelevant for new buildings, but maybe interesting for old building renovation? As far as I know, the flow temperatures are at least somewhat lower than traditional radiators. But thanks for the feedback. I am just looking for alternatives to underfloor heating.

There are also low-temperature radiators, which are not underfloor heating either, but better than grandma’s radiator.