Set the heating correctly

You have to ask the Heizi even if you are not on good terms with him. He can give you the information.

was was even set to 60 degrees beforehand, but one reads that Legionella are only killed at 55 degrees

... what made you deviate from the 60 degrees and lower it if it was preset?

A heating system is usually preset by the installer; this belongs to the service before handover. It should basically work both in summer and winter. Individually, you can and should adjust it if, for example, the daily rhythm does not harmonize with the preset or the demand in some rooms is different.

The individual room thermostat of the warmest room should be set high, and the others adjusted as mentioned above. Problems can occur with external sensors if it is not very cold outside yet, but more warmth is wanted inside. Then you can also change the 22 degrees, for example to 23/24 degrees. You basically cannot do anything wrong if you leave the basics (settings you do not understand anyway) alone. What does always say so nicely: Never Touch a Running System ... or something like that

What irritates me: Reduction... heating off. It is about the so-called night setback, which some still have, others no longer set because of the inertia of underfloor heating. We lower it by 2 degrees in the evening, set at 9 pm, and then in the afternoon the target temperature is back on. Heating off would not be good! But this should also be quickly found in the manual; you don't call your installer for small things whether the ratio is good or bad.

If you get your place and also your bath water warm, your consumption remains within the norm daily, everything should be fine.

Edit: I can't say anything about your menu items, I don't go into that with us and I am only a user of a gas condensing boiler.

Regards

I hardly believe that the technician preset anything, everything was at factory settings, especially since the max flow temperature was only 70 degrees and that is not really healthy for underfloor heating or screed, therefore I doubt whether a hydraulic balancing was done at all, it is actually quite difficult to check, you could possibly set all RTH to 30 degrees and then check the temperature in each room to see if it rises evenly. Regarding the night setback, basically it doesn't matter what I set there, overnight I lose maybe 1 degree at most.

Of course, I have a gas condensing boiler with a 170l storage tank, I’m realizing myself that a 170l tank is actually hardly ever going to get legionella because it gets used up quite quickly

That is only true if bathing is done continuously, meaning the storage tank is operated as an instantaneous water heater. And that certainly won’t happen. So there is more or less always water in the tank.

Regarding the heating, can I somehow check whether a hydraulic balancing has been done?

There should be a protocol for that. If not ... ask and have it corrected. If you no longer want the installer at your place, you should look for another and commission them (perhaps with a maintenance contract, so that the new one is motivated to actually come).

Set the target temperature to 20 degrees as a test, it still goes up to 50 degrees flow temperature tried 17 degrees as well, it still always goes to 50 degrees, something is going wrong

Hi,

is the heating perhaps still running in the [Estrichtrocknungsprogramm]? Have you looked at the heating curve? For a modern house, they are usually set way too high and too steep.

Best regards,

Andreas