Adjusting an infrared heater problems

Hello,
I have just put my first infrared heater into operation and want to heat my living room. It is a low-energy house. For the living room size of 40 m², I should manage with 1800 watts of power, distributed over 1 x 1000 and 1 x 800 watts.
The heater is controlled by a wireless thermostat.
I have a normal room thermometer that shows me 21.4 degrees. My comfort temperature is 22 degrees.
However, the wireless thermostat shows me 24.5 degrees.
1. How should I set the target temperature on the thermostat now if I want to achieve a comfort temperature of 22 degrees?

If I set the target temperature to 22 degrees now, I feel that nothing changes.
2. Or do I possibly have to set the target temperature significantly higher? In my opinion, that cannot be the point.
3. How long should it then take for the target temperature to be reached?

It would be nice if someone could share their experience with me.
Thank you very much

I have no experience with this (special) heater, but if it’s not warm enough yet, let it run longer, so turn it up, no matter what the thermostat shows.
Is the thermostat closer to the heat source than the thermometer?
Increase the target temperature by 0.5-1 degree.

What kind of house exactly is this with what energy demand?

I have a normal room thermometer that shows me 21.4 degrees. My comfort temperature is 22 degrees. However, the wireless thermostat shows me 24.5 degrees.

You first have to determine what your comfort temperature is with respect to the wireless thermostat. The comfort temperature is not fixed but also depends on the type of heating - and half a degree is practically a direct hit. "Normal" thermometers tend to show slightly different temperatures.

1. How do I have to set the target temperature on the thermostat now if I want to achieve a comfort temperature of 22 degrees? When I set the target temperature to 22 degrees now, I feel like nothing changes.

hmm. If the thermostat shows 24 degrees, it seems more than understandable to me that nothing happens at a target temperature of 22 degrees. The infrared heater can’t cool, you know ;) .

2. Or do I possibly have to set the target temperature much higher? But in my opinion, that cannot be the purpose.

See above - try it out. And yes, that can be the purpose if the thermostat simply does not show the correct temperature. Where is the real problem?

3. How long should it take until the target temperature should be reached?

That should happen quickly. Are you familiar with how an infrared heater works? It works completely differently from "normal" heaters.

"Normal" thermometers tend to show slightly different temperatures.

That's exactly how it is. Resolution 0.1 degrees, accuracy 1 degree. ;)