Fan assisted radiators can be as effective as under floor wet heating. So can large panel radiators. When designing the size of a fan assisted radiator take care to get accurate figures for heat transfer efficiency at lower temperatures. The graph of heat transfer against water temperature is not linear and can droop at water temperatures that are below the bottom end of the graph
OMG!! You spout some load of drivel BG. Have you ever seen, let alone lived, in a house with fan convectors??
Awful things, perhaps one of the worst heat emitters, ever!!!
But hey, if you were enlightened by Google AGAIN it must be true!!