Hello

Our house has some single and double radiators, probably 1980s vintage,
fed from a conventional gas fired boiler.

Except for the fact that they might be full of rust and sludge etc., is
there anything radically different about modern designs which would make
them more efficient?

In other words, if they are still of sound construction, is there much
point in replacing them?

Might it be just as sensible to get the system (and thus the radiators)
power-flushed?

DDS