ᐅ Radiator quotation for bedroom

Hello,
a plumbing company offered me the following radiator:
Kermi flat panel radiator x2 Verteo Profil, vertical, type 22, 1800 x 600 mm (H x W)
for my 15 sqm (161 sq ft) bedroom.
The output is specified as follows:

System temperature 75/65°C (167/149°F): 2281 W
System temperature 70/55°C (158/131°F): 1818 W
System temperature 55/45°C (131/113°F): 1142 W

On another website, I read that you should calculate about 100 watts per sqm (9.3 watts per sq ft).
So I would need 1500 watts.

Can someone help me understand these values and whether this radiator is suitable for my bedroom?

Thank you in advance.

Target temperature in the bedroom?
Old radiator for comparison?
What type of heating system?
What supply temperature?
What temperature difference?
What kind of house with what insulation?

The values are quite clear
Supply temperature / return temperature / output

Answer to the question: can be much too large, much too small, or just right

Unfortunately, I cannot answer everything.
We live in an unrenovated old building built in 1910. There was no radiator in that room before, so no comparison is possible.
Room temperature should not exceed 21 degrees Celsius (70°F).
Heating: district heating

I cannot answer about the flow temperature and temperature difference; how could I find out?

Axel900 schrieb:

I can’t answer about the flow temperature and temperature difference, how can I find that out?

You set those yourself on your heating system.

Or do you perhaps live in an apartment building?

nordanney schrieb:

You adjust that yourself on your heating system.

With the district heating mentioned in #3, that’s usually not the case, right?

Damn. Overlooked that. It should then be specified at the transfer station or in the contract.