cast-iron radiators from the times of the Polish People's Republic - thermal

I carry out a major renovation of a house built in 1980 and I wonder whether to replace the radiators with new ones. Of course, I have a project in which the powers needed to heat each room are calculated. Before making a decision, I would like to know the power of existing cast iron radiators to find out if their power is sufficient for the designed low-temperature heating. Are there any power tables for radiators or individual fins from the times of the PRL?

It seems to me that a similar topic was recently (maybe a few months ago). Look for .

I don't know if there are tables, but one rib per 1 m2 was once important. So hanging 20m2 20 ribs or 2x10

There are actually materials on the calf power of cast iron fins. I close the topic.