Termet Ecocondens Gold Plus 24kW - what is the temperature in the boiler

I have just changed from the old smoke to the Termet Ecocondens Gold Plus 24kW condensing gas boiler. For heating 160m2, a mixed system - radiators-floor heating, a system with a hydraulic coupler + DHW. There are 2 families living in the house - the ground floor and a separate floor. I don't have a room regulator or a weather forecast. The radiators work on their own pump (2 floors), the floor heating on its own. The service technician set the boiler on the 55-degree supply. I set the floor on the mixer at 30 degrees. Outside, positive temperatures, the boiler was still working at low speed but it did not turn off, the burner icon was constantly on and the gas consumption was over 10m3 per day. Heaters twisted on thermostats for 2.5, very lukewarm and that's enough because it's warm at home, and in my opinion, consumption is high, and there was no frost. I'm afraid of what will happen when the frosts will be? I lowered the supply temperature on the boiler to a minimum of 40 degrees, the boiler turns off at 45 degrees and turns on at 35, quite often, but consumption has dropped significantly. It is known that when the frosts come, it will be necessary to increase the temperature on the supply. Let someone tell me if I did the right thing by reducing the temperature on the boiler, because why should the boiler maintain the temperature of 55 if there is no heat reception by the radiators and the boiler was burning gas all the time.

The lower the return temperature, the better the condensation, i.e. the greater the saving. The lower the temperature you set, the more economical it will be. But if you overdo it or if the outside temperature drops, you won't heat the rooms. In practice, however, the difference in combustion between 55 and 45 degrees may be so small that you won't notice it. The highest combustion is always at the beginning of the season when you are heating up a completely cold system, later everything stabilises.
For the condensing boiler itself, low temperatures are not detrimental in any way.

The return from the radiators is practically always cold as there is practically no circulation, from the floor it comes back a little, on the coupling the power supply shows 40 degrees, the return 37, probably the coupling directs most of the heating medium to the return to the boiler because the floor doesn't need much and the radiators are turned up to 2.5 I know that this boiler can be changed to the floor operating parameters 25-55 °C, because now it is set at 40-80 °C and I can't go lower but is there any point. I keep thinking about the weather sensor, there are different opinions about it, and with my "complicated" installation split into 2 families I was advised against this solution.

4_master wrote:

I think about the weather sensor all the time, there are different opinions about it, and with my "complicated" installation split between 2 families I was advised against such a solution

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What about housing estates with 100 flats each with a single weathervane?

You have already observed for yourself that it is enough to lower the temperature a little to decrease the gas burn.
The automation does nothing more than make sure that the temperature on the boiler is as low as possible to the current temperature outside.

I will leave aside the fact of 24kW where the demand fluctuates around 14kW

There is currently 160m2 but there will be over 40 more, the boiler modulates power from 2.8 kW anyway.

I would advise you to install a weather forecast, I also heat the building with a 160 m gas boiler 25 kW, but I only have heaters, and now if you want to have heat at home, you use about 8-9.5 m of gas. I was also thinking about installing the weatherproof and after installing it, I am happy with its operation, the boiler power is reduced to 12 kW and it is good. Why should you think and run to the boiler and set the flow temperature, if you set the appropriate heating curve, it will control the temperature, after all, the controller and the external sensor are not that expensive.