Nope - P+ has a single row of convectors so wouldn't normally have the same effective output. Even though those rads are old, they were very advanced for their time. They were really the first to be designed as true convecting radiators as we know them today and had a comparable output, even though they were designed with a higher delta in mindWould a modern Pplus not be similar output?
Nope - Not usually - The heat output is the heat output, the larger fins just allow the rad to convect more efficiently, so heat a given space more effectively.The thins are bigger on a modern Pplus rads. So the heat output maybe similar
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