Quick question about radiators..

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why do some radiators have the pipe inlets at the top? mainly on older ones i have seen.

also have seen some with diagonal inlets, top and bottom.

anyone know why?
 
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Rad output is slighlty higher if the water goes in at the top of one end and out of the bottom at the other, and the convection helps the flow( the old reason). But these days everything's pumped and it makes little difference.
 

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